diff --git a/beacon_chain/beacon_chain_db_immutable.nim b/beacon_chain/beacon_chain_db_immutable.nim
index 84593eb8e..e3fd2108d 100644
--- a/beacon_chain/beacon_chain_db_immutable.nim
+++ b/beacon_chain/beacon_chain_db_immutable.nim
@@ -16,7 +16,7 @@ from ./spec/datatypes/capella import
 from ./spec/datatypes/deneb import ExecutionPayloadHeader
 
 type
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconstate
   # Memory-representation-equivalent to a phase0 BeaconState for in-place SSZ
   # reading and writing
   Phase0BeaconStateNoImmutableValidators* = object
@@ -69,7 +69,7 @@ type
     current_justified_checkpoint*: Checkpoint
     finalized_checkpoint*: Checkpoint
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#beaconstate
   # Memory-representation-equivalent to an Altair BeaconState for in-place SSZ
   # reading and writing
   AltairBeaconStateNoImmutableValidators* = object
@@ -186,7 +186,7 @@ type
     # Execution
     latest_execution_payload_header*: bellatrix.ExecutionPayloadHeader  # [New in Bellatrix]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#beaconstate
   # with indirect changes via ExecutionPayload
   # Memory-representation-equivalent to a Capella BeaconState for in-place SSZ
   # reading and writing
@@ -258,7 +258,7 @@ type
       HashList[HistoricalSummary,
         Limit HISTORICAL_ROOTS_LIMIT]  # [New in Capella]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#beaconstate
   # with indirect changes via ExecutionPayloadHeader
   # Memory-representation-equivalent to a Deneb BeaconState for in-place SSZ
   # reading and writing
diff --git a/beacon_chain/consensus_object_pools/README.md b/beacon_chain/consensus_object_pools/README.md
index 4d84bcc0c..eb9b56afc 100644
--- a/beacon_chain/consensus_object_pools/README.md
+++ b/beacon_chain/consensus_object_pools/README.md
@@ -5,7 +5,7 @@ This folder holds the various consensus object pools needed for a blockchain cli
 Object in those pools have passed the "gossip validation" filter according
 to specs:
 - blocks: https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#beacon_block
-- aggregate attestations: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
+- aggregate attestations: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
 - unaggregated attestation: https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
 - voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.1/specs/phase0/p2p-interface.md#voluntary_exit
 - Attester slashings: https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#attester_slashing
diff --git a/beacon_chain/consensus_object_pools/attestation_pool.nim b/beacon_chain/consensus_object_pools/attestation_pool.nim
index cfcdb2abb..c3b90a10e 100644
--- a/beacon_chain/consensus_object_pools/attestation_pool.nim
+++ b/beacon_chain/consensus_object_pools/attestation_pool.nim
@@ -772,7 +772,7 @@ proc getBeaconHead*(
     finalizedExecutionPayloadHash =
       pool.dag.loadExecutionBlockHash(pool.dag.finalizedHead.blck)
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/fork_choice/safe-block.md#get_safe_execution_payload_hash
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/fork_choice/safe-block.md#get_safe_execution_payload_hash
     safeBlockRoot = pool.forkChoice.get_safe_beacon_block_root()
     safeBlock = pool.dag.getBlockRef(safeBlockRoot)
     safeExecutionPayloadHash =
diff --git a/beacon_chain/consensus_object_pools/block_dag.nim b/beacon_chain/consensus_object_pools/block_dag.nim
index 63c55c2ef..b7e375619 100644
--- a/beacon_chain/consensus_object_pools/block_dag.nim
+++ b/beacon_chain/consensus_object_pools/block_dag.nim
@@ -134,7 +134,7 @@ func link*(parent, child: BlockRef) =
 func get_ancestor*(blck: BlockRef, slot: Slot,
     maxDepth = 100'i64 * 365 * 24 * 60 * 60 div SECONDS_PER_SLOT.int):
     BlockRef =
-  ## https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#get_ancestor
+  ## https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#get_ancestor
   ## Return the most recent block as of the time at `slot` that not more recent
   ## than `blck` itself
   if isNil(blck): return nil
diff --git a/beacon_chain/consensus_object_pools/blockchain_dag.nim b/beacon_chain/consensus_object_pools/blockchain_dag.nim
index f5125cf1c..fd87abfdf 100644
--- a/beacon_chain/consensus_object_pools/blockchain_dag.nim
+++ b/beacon_chain/consensus_object_pools/blockchain_dag.nim
@@ -1931,7 +1931,7 @@ proc pruneBlocksDAG(dag: ChainDAGRef) =
     prunedHeads = hlen - dag.heads.len,
     dagPruneDur = Moment.now() - startTick
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/sync/optimistic.md#helpers
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/sync/optimistic.md#helpers
 template is_optimistic*(dag: ChainDAGRef, bid: BlockId): bool =
   let blck =
     if bid.slot <= dag.finalizedHead.slot:
diff --git a/beacon_chain/consensus_object_pools/spec_cache.nim b/beacon_chain/consensus_object_pools/spec_cache.nim
index d71e8a67c..1e5bb2daa 100644
--- a/beacon_chain/consensus_object_pools/spec_cache.nim
+++ b/beacon_chain/consensus_object_pools/spec_cache.nim
@@ -25,7 +25,7 @@ logScope: topics = "spec_cache"
 func count_active_validators*(shufflingRef: ShufflingRef): uint64 =
   shufflingRef.shuffled_active_validator_indices.lenu64
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_committee_count_per_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_committee_count_per_slot
 func get_committee_count_per_slot*(shufflingRef: ShufflingRef): uint64 =
   get_committee_count_per_slot(count_active_validators(shufflingRef))
 
@@ -51,7 +51,7 @@ iterator get_beacon_committee*(
     committees_per_slot * SLOTS_PER_EPOCH
   ): yield (index_in_committee, idx)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_beacon_committee
 func get_beacon_committee*(
     shufflingRef: ShufflingRef, slot: Slot, committee_index: CommitteeIndex):
     seq[ValidatorIndex] =
diff --git a/beacon_chain/consensus_object_pools/sync_committee_msg_pool.nim b/beacon_chain/consensus_object_pools/sync_committee_msg_pool.nim
index 86d87feb3..c9848be60 100644
--- a/beacon_chain/consensus_object_pools/sync_committee_msg_pool.nim
+++ b/beacon_chain/consensus_object_pools/sync_committee_msg_pool.nim
@@ -349,7 +349,7 @@ proc produceSyncAggregate*(
 
 proc isEpochLeadTime*(
     pool: SyncCommitteeMsgPool, epochsToSyncPeriod: uint64): bool =
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#sync-committee-subnet-stability
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#sync-committee-subnet-stability
   # This ensures a uniform distribution without requiring additional state:
   # (1/4)                         = 1/4, 4 slots out
   # (3/4) * (1/3)                 = 1/4, 3 slots out
diff --git a/beacon_chain/deposits.nim b/beacon_chain/deposits.nim
index 4e788d816..9c39d1bea 100644
--- a/beacon_chain/deposits.nim
+++ b/beacon_chain/deposits.nim
@@ -223,7 +223,7 @@ proc restValidatorExit(config: BeaconNodeConf) {.async.} =
     let response = await client.getSpec()
     if response.status == 200:
       let spec = response.data
-      # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#voluntary-exits
+      # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#voluntary-exits
       # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/beacon-chain.md#modified-process_voluntary_exit
       if currentEpoch >= Epoch(spec.data.DENEB_FORK_EPOCH):
         Fork(
diff --git a/beacon_chain/el/el_manager.nim b/beacon_chain/el/el_manager.nim
index d0e628ec1..1b64ba022 100644
--- a/beacon_chain/el/el_manager.nim
+++ b/beacon_chain/el/el_manager.nim
@@ -425,11 +425,11 @@ template toGaugeValue(x: Quantity): int64 =
 #  doAssert SECONDS_PER_ETH1_BLOCK * cfg.ETH1_FOLLOW_DISTANCE < GENESIS_DELAY,
 #             "Invalid configuration: GENESIS_DELAY is set too low"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#get_eth1_data
 func compute_time_at_slot(genesis_time: uint64, slot: Slot): uint64 =
   genesis_time + slot * SECONDS_PER_SLOT
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#get_eth1_data
 func voting_period_start_time(state: ForkedHashedBeaconState): uint64 =
   let eth1_voting_period_start_slot =
     getStateField(state, slot) - getStateField(state, slot) mod
@@ -437,7 +437,7 @@ func voting_period_start_time(state: ForkedHashedBeaconState): uint64 =
   compute_time_at_slot(
     getStateField(state, genesis_time), eth1_voting_period_start_slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#get_eth1_data
 func is_candidate_block(cfg: RuntimeConfig,
                         blk: Eth1Block,
                         period_start: uint64): bool =
@@ -1680,7 +1680,7 @@ template trackFinalizedState*(m: ELManager,
                               finalizedStateDepositIndex: uint64): bool =
   trackFinalizedState(m.eth1Chain, finalizedEth1Data, finalizedStateDepositIndex)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#get_eth1_data
 proc getBlockProposalData*(chain: var Eth1Chain,
                            state: ForkedHashedBeaconState,
                            finalizedEth1Data: Eth1Data,
diff --git a/beacon_chain/el/merkle_minimal.nim b/beacon_chain/el/merkle_minimal.nim
index dc98f8fb6..d943e0c43 100644
--- a/beacon_chain/el/merkle_minimal.nim
+++ b/beacon_chain/el/merkle_minimal.nim
@@ -7,7 +7,7 @@
 
 {.push raises: [].}
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
 
 # Merkle tree helpers
 # ---------------------------------------------------------------
diff --git a/beacon_chain/fork_choice/fork_choice.nim b/beacon_chain/fork_choice/fork_choice.nim
index ec20b5794..5083414c1 100644
--- a/beacon_chain/fork_choice/fork_choice.nim
+++ b/beacon_chain/fork_choice/fork_choice.nim
@@ -107,7 +107,7 @@ proc update_justified(
   self.update_justified(dag, blck, justified.epoch)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#update_checkpoints
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#update_checkpoints
 proc update_checkpoints(
     self: var Checkpoints, dag: ChainDAGRef,
     checkpoints: FinalityCheckpoints): FcResult[void] =
@@ -124,7 +124,7 @@ proc update_checkpoints(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#on_tick_per_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#on_tick_per_slot
 proc on_tick(
     self: var ForkChoice, dag: ChainDAGRef, time: BeaconTime): FcResult[void] =
   ## Must be called at least once per slot.
@@ -206,7 +206,7 @@ func contains*(self: ForkChoiceBackend, block_root: Eth2Digest): bool =
   ## In particular, before adding a block, its parent must be known to the fork choice
   self.proto_array.indices.contains(block_root)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#on_attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#on_attestation
 proc on_attestation*(
        self: var ForkChoice,
        dag: ChainDAGRef,
@@ -235,7 +235,7 @@ proc on_attestation*(
       block_root: beacon_block_root))
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#on_attester_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#on_attester_slashing
 func process_equivocation*(
        self: var ForkChoice,
        validator_index: ValidatorIndex
@@ -350,7 +350,7 @@ func find_head*(
 
   return ok(new_head)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#get_head
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#get_head
 proc get_head*(self: var ForkChoice,
                dag: ChainDAGRef,
                wallTime: BeaconTime): FcResult[Eth2Digest] =
@@ -364,7 +364,7 @@ proc get_head*(self: var ForkChoice,
     self.checkpoints.justified.balances,
     self.checkpoints.proposer_boost_root)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/fork_choice/safe-block.md#get_safe_beacon_block_root
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/fork_choice/safe-block.md#get_safe_beacon_block_root
 func get_safe_beacon_block_root*(self: ForkChoice): Eth2Digest =
   # Use most recent justified block as a stopgap
   self.checkpoints.justified.checkpoint.root
diff --git a/beacon_chain/fork_choice/proto_array.nim b/beacon_chain/fork_choice/proto_array.nim
index ed3a54c32..558b985d1 100644
--- a/beacon_chain/fork_choice/proto_array.nim
+++ b/beacon_chain/fork_choice/proto_array.nim
@@ -123,7 +123,7 @@ iterator realizePendingCheckpoints*(
   # Reset tip tracking for new epoch
   self.currentEpochTips.clear()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#get_weight
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#get_weight
 func calculateProposerBoost(validatorBalances: openArray[Gwei]): uint64 =
   var total_balance: uint64
   for balance in validatorBalances:
@@ -190,7 +190,7 @@ func applyScoreChanges*(self: var ProtoArray,
     # If we find the node matching the current proposer boost root, increase
     # the delta by the new score amount.
     #
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#get_weight
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#get_weight
     if (not proposerBoostRoot.isZero) and proposerBoostRoot == node.bid.root:
       proposerBoostScore = calculateProposerBoost(newBalances)
       if  nodeDelta >= 0 and
diff --git a/beacon_chain/gossip_processing/README.md b/beacon_chain/gossip_processing/README.md
index 227b5a038..e084147e5 100644
--- a/beacon_chain/gossip_processing/README.md
+++ b/beacon_chain/gossip_processing/README.md
@@ -10,7 +10,7 @@ This folder holds a collection of modules to:
 Gossip validation is different from consensus verification in particular for blocks.
 
 - Blocks: https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#beacon_block
-- Attestations (aggregated): https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
+- Attestations (aggregated): https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
 - Attestations (unaggregated): https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#attestation-subnets
 - Voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/p2p-interface.md#voluntary_exit
 - Proposer slashings: https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/p2p-interface.md#proposer_slashing
diff --git a/beacon_chain/gossip_processing/block_processor.nim b/beacon_chain/gossip_processing/block_processor.nim
index 5c11a26ba..021978777 100644
--- a/beacon_chain/gossip_processing/block_processor.nim
+++ b/beacon_chain/gossip_processing/block_processor.nim
@@ -780,7 +780,7 @@ proc processBlock(
     # - MUST NOT optimistically import the block.
     # - MUST NOT apply the block to the fork choice store.
     # - MAY queue the block for later processing.
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/sync/optimistic.md#execution-engine-errors
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/sync/optimistic.md#execution-engine-errors
     await sleepAsync(chronos.seconds(1))
     self[].addBlock(
       entry.src, entry.blck, entry.blobs, entry.resfut, entry.maybeFinalized,
diff --git a/beacon_chain/gossip_processing/eth2_processor.nim b/beacon_chain/gossip_processing/eth2_processor.nim
index 679908583..0ea2d6e25 100644
--- a/beacon_chain/gossip_processing/eth2_processor.nim
+++ b/beacon_chain/gossip_processing/eth2_processor.nim
@@ -657,7 +657,7 @@ proc processSignedContributionAndProof*(
 
     err(v.error())
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
 proc processLightClientFinalityUpdate*(
     self: var Eth2Processor, src: MsgSource,
     finality_update: ForkedLightClientFinalityUpdate
@@ -673,7 +673,7 @@ proc processLightClientFinalityUpdate*(
     beacon_light_client_finality_update_dropped.inc(1, [$v.error[0]])
   v
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
 proc processLightClientOptimisticUpdate*(
     self: var Eth2Processor, src: MsgSource,
     optimistic_update: ForkedLightClientOptimisticUpdate
diff --git a/beacon_chain/gossip_processing/gossip_validation.nim b/beacon_chain/gossip_processing/gossip_validation.nim
index 8778cfb8a..dd9a335c7 100644
--- a/beacon_chain/gossip_processing/gossip_validation.nim
+++ b/beacon_chain/gossip_processing/gossip_validation.nim
@@ -95,7 +95,7 @@ func check_propagation_slot_range(
     return ok(msgSlot)
 
   if consensusFork < ConsensusFork.Deneb:
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#configuration
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#configuration
     # The spec value of ATTESTATION_PROPAGATION_SLOT_RANGE is 32, but it can
     # retransmit attestations on the cusp of being out of spec, and which by
     # the time they reach their destination might be out of spec.
@@ -104,13 +104,13 @@ func check_propagation_slot_range(
     if msgSlot + ATTESTATION_PROPAGATION_SLOT_RANGE < pastSlot.slot:
       return errIgnore("Attestation slot in the past")
   else:
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#beacon_attestation_subnet_id
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#beacon_attestation_subnet_id
     # "[IGNORE] the epoch of attestation.data.slot is either the current or
     # previous epoch (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e.
     # compute_epoch_at_slot(attestation.data.slot) in
     # (get_previous_epoch(state), get_current_epoch(state))"
     #
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
     # "[IGNORE] the epoch of aggregate.data.slot is either the current or
     # previous epoch (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e.
     # compute_epoch_at_slot(aggregate.data.slot) in
@@ -413,7 +413,7 @@ proc validateBeaconBlock*(
   # proposer for the slot, signed_beacon_block.message.slot.
   #
   # While this condition is similar to the proposer slashing condition at
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#proposer-slashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#proposer-slashing
   # it's not identical, and this check does not address slashing:
   #
   # (1) The beacon blocks must be conflicting, i.e. different, for the same
@@ -560,8 +560,8 @@ proc validateBeaconBlock*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
 proc validateAttestation*(
     pool: ref AttestationPool,
     batchCrypto: ref BatchCrypto,
@@ -591,7 +591,7 @@ proc validateAttestation*(
   # >= attestation.data.slot (a client MAY queue future attestations for
   # processing at the appropriate slot).
   #
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#beacon_attestation_subnet_id
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#beacon_attestation_subnet_id
   # modifies this for Deneb and newer forks.
   block:
     let v = check_propagation_slot_range(
@@ -731,8 +731,8 @@ proc validateAttestation*(
 
   return ok((validator_index, sig))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
 proc validateAggregate*(
     pool: ref AttestationPool,
     batchCrypto: ref BatchCrypto,
@@ -763,7 +763,7 @@ proc validateAggregate*(
   # MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e. aggregate.data.slot +
   # ATTESTATION_PROPAGATION_SLOT_RANGE >= current_slot >= aggregate.data.slot
   #
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
   # modifies this for Deneb and newer forks.
   block:
     let v = check_propagation_slot_range(
@@ -1067,7 +1067,7 @@ proc validateVoluntaryExit*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#sync_committee_subnet_id
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#sync_committee_subnet_id
 proc validateSyncCommitteeMessage*(
     dag: ChainDAGRef,
     quarantine: ref Quarantine,
@@ -1308,7 +1308,7 @@ proc validateContribution*(
 
   return ok((blck.bid, sig, participants))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#light_client_finality_update
 proc validateLightClientFinalityUpdate*(
     pool: var LightClientPool, dag: ChainDAGRef,
     finality_update: ForkedLightClientFinalityUpdate,
@@ -1344,7 +1344,7 @@ proc validateLightClientFinalityUpdate*(
   pool.latestForwardedFinalitySlot = finalized_slot
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
 proc validateLightClientOptimisticUpdate*(
     pool: var LightClientPool, dag: ChainDAGRef,
     optimistic_update: ForkedLightClientOptimisticUpdate,
diff --git a/beacon_chain/gossip_processing/light_client_processor.nim b/beacon_chain/gossip_processing/light_client_processor.nim
index 16eb1d74a..39f04ecbf 100644
--- a/beacon_chain/gossip_processing/light_client_processor.nim
+++ b/beacon_chain/gossip_processing/light_client_processor.nim
@@ -528,7 +528,7 @@ func toValidationError(
       # previously forwarded `optimistic_update`s
       errIgnore($r.error)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
 proc processLightClientFinalityUpdate*(
     self: var LightClientProcessor, src: MsgSource,
     finality_update: ForkedLightClientFinalityUpdate
@@ -543,7 +543,7 @@ proc processLightClientFinalityUpdate*(
   self.latestFinalityUpdate = finality_update.toOptimistic
   v
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
 proc processLightClientOptimisticUpdate*(
     self: var LightClientProcessor, src: MsgSource,
     optimistic_update: ForkedLightClientOptimisticUpdate
diff --git a/beacon_chain/libnimbus_lc/libnimbus_lc.nim b/beacon_chain/libnimbus_lc/libnimbus_lc.nim
index d77d32b04..e9e2c714f 100644
--- a/beacon_chain/libnimbus_lc/libnimbus_lc.nim
+++ b/beacon_chain/libnimbus_lc/libnimbus_lc.nim
@@ -74,7 +74,7 @@ proc ETHConsensusConfigCreateFromYaml(
   ## * `NULL` - If the given `config.yaml` is malformed or incompatible.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/configs/README.md
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/configs/README.md
   let cfg = RuntimeConfig.new()
   try:
     cfg[] = readRuntimeConfig($configFileContent, "config.yaml")[0]
@@ -138,11 +138,11 @@ proc ETHBeaconStateCreateFromSsz(
   ## * `NULL` - If the given `sszBytes` is malformed.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconstate
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#beaconstate
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#beaconstate
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#beaconstate
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/configs/README.md
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconstate
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#beaconstate
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#beaconstate
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#beaconstate
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/configs/README.md
   let
     consensusFork = decodeEthConsensusVersion($consensusVersion).valueOr:
       return nil
@@ -191,7 +191,7 @@ proc ETHRootDestroy(root: ptr Eth2Digest) {.exported.} =
   ## * `root` - Merkle root.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#custom-types
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#custom-types
   root.destroy()
 
 proc ETHForkDigestsCreateFromState(
@@ -210,7 +210,7 @@ proc ETHForkDigestsCreateFromState(
   ## * Pointer to an initialized fork digests cache based on the beacon state.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#compute_fork_digest
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#compute_fork_digest
   let forkDigests = ForkDigests.new()
   forkDigests[] = ForkDigests.init(
     cfg[], getStateField(state[], genesis_validators_root))
@@ -261,7 +261,7 @@ proc ETHBeaconClockGetSlot(beaconClock: ptr BeaconClock): cint {.exported.} =
   ## * `0` - If genesis is still pending.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#custom-types
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#custom-types
   beaconClock[].now().slotOrZero().cint
 
 const lcDataFork = LightClientDataFork.high
@@ -320,8 +320,8 @@ proc ETHLightClientStoreCreateFromBootstrap(
   ## See:
   ## * https://ethereum.github.io/beacon-APIs/?urls.primaryName=v2.4.1#/Beacon/getLightClientBootstrap
   ## * https://ethereum.github.io/beacon-APIs/?urls.primaryName=v2.4.1#/Events/eventstream
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/light-client.md
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/weak-subjectivity.md#weak-subjectivity-period
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/light-client.md
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/weak-subjectivity.md#weak-subjectivity-period
   let
     mediaType = MediaType.init($mediaType)
     consensusFork = decodeEthConsensusVersion($consensusVersion).valueOr:
@@ -727,7 +727,7 @@ func ETHLightClientStoreGetFinalizedHeader(
   ## * Latest finalized header.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
   addr store[].finalized_header
 
 func ETHLightClientStoreIsNextSyncCommitteeKnown(
@@ -746,8 +746,8 @@ func ETHLightClientStoreIsNextSyncCommitteeKnown(
   ## * Whether or not the next sync committee is currently known.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/light-client.md
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/light-client.md
   store[].is_next_sync_committee_known
 
 func ETHLightClientStoreGetOptimisticHeader(
@@ -766,7 +766,7 @@ func ETHLightClientStoreGetOptimisticHeader(
   ## * Latest optimistic header.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
   addr store[].optimistic_header
 
 func ETHLightClientStoreGetSafetyThreshold(
@@ -787,7 +787,7 @@ func ETHLightClientStoreGetSafetyThreshold(
   ## * Light client store safety threshold.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#get_safety_threshold
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#get_safety_threshold
   store[].get_safety_threshold.cint
 
 proc ETHLightClientHeaderCreateCopy(
@@ -833,7 +833,7 @@ proc ETHLightClientHeaderCopyBeaconRoot(
   ## * Pointer to a copy of the given header's beacon block root.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#hash_tree_root
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#hash_tree_root
   discard cfg  # Future-proof against new fields, see `get_lc_execution_root`.
   let root = Eth2Digest.new()
   root[] = header[].beacon.hash_tree_root()
@@ -855,7 +855,7 @@ func ETHLightClientHeaderGetBeacon(
   ## * Beacon block header.
   ##
   ## See:
-  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconblockheader
+  ## * https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconblockheader
   addr header[].beacon
 
 func ETHBeaconBlockHeaderGetSlot(
diff --git a/beacon_chain/light_client.nim b/beacon_chain/light_client.nim
index beb11b3d4..81d5757a4 100644
--- a/beacon_chain/light_client.nim
+++ b/beacon_chain/light_client.nim
@@ -353,7 +353,7 @@ proc installMessageValidators*(
           digest = forkDigests[].atConsensusFork(contextFork)
 
         # light_client_optimistic_update
-        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#light_client_finality_update
         lightClient.network.addValidator(
           getLightClientFinalityUpdateTopic(digest), proc (
             msg: lcDataFork.LightClientFinalityUpdate
@@ -361,7 +361,7 @@ proc installMessageValidators*(
             validate(msg, contextFork, processLightClientFinalityUpdate))
 
         # light_client_optimistic_update
-        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
         lightClient.network.addValidator(
           getLightClientOptimisticUpdateTopic(digest), proc (
             msg: lcDataFork.LightClientOptimisticUpdate
diff --git a/beacon_chain/networking/eth2_network.nim b/beacon_chain/networking/eth2_network.nim
index dc3230b12..0b183fd7d 100644
--- a/beacon_chain/networking/eth2_network.nim
+++ b/beacon_chain/networking/eth2_network.nim
@@ -2255,8 +2255,8 @@ proc getPersistentNetKeys*(
 
 func gossipId(
     data: openArray[byte], phase0Prefix, topic: string): seq[byte] =
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#topics-and-messages
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#topics-and-messages
   const
     MESSAGE_DOMAIN_INVALID_SNAPPY = [0x00'u8, 0x00, 0x00, 0x00]
     MESSAGE_DOMAIN_VALID_SNAPPY = [0x01'u8, 0x00, 0x00, 0x00]
@@ -2554,7 +2554,7 @@ proc updateStabilitySubnetMetadata*(node: Eth2Node, attnets: AttnetBits) =
   node.metadata.seq_number += 1
   node.metadata.attnets = attnets
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#attestation-subnet-subscription
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#attestation-subnet-subscription
   # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#attestation-subnet-bitfield
   let res = node.discovery.updateRecord({
     enrAttestationSubnetsField: SSZ.encode(node.metadata.attnets)
@@ -2567,7 +2567,7 @@ proc updateStabilitySubnetMetadata*(node: Eth2Node, attnets: AttnetBits) =
     debug "Stability subnets changed; updated ENR attnets", attnets
 
 proc updateSyncnetsMetadata*(node: Eth2Node, syncnets: SyncnetBits) =
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#sync-committee-subnet-stability
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#sync-committee-subnet-stability
   if node.metadata.syncnets == syncnets:
     return
 
diff --git a/beacon_chain/nimbus_beacon_node.nim b/beacon_chain/nimbus_beacon_node.nim
index 331e51a7c..1926d1767 100644
--- a/beacon_chain/nimbus_beacon_node.nim
+++ b/beacon_chain/nimbus_beacon_node.nim
@@ -774,7 +774,7 @@ func forkDigests(node: BeaconNode): auto =
     node.dag.forkDigests.deneb]
   forkDigestsArray
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#attestation-subnet-subscription
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#attestation-subnet-subscription
 proc updateAttestationSubnetHandlers(node: BeaconNode, slot: Slot) =
   if node.gossipState.card == 0:
     # When disconnected, updateGossipState is responsible for all things
@@ -1488,7 +1488,7 @@ proc installMessageValidators(node: BeaconNode) =
 
       when consensusFork >= ConsensusFork.Altair:
         # sync_committee_{subnet_id}
-        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#sync_committee_subnet_id
+        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#sync_committee_subnet_id
         for subcommitteeIdx in SyncSubcommitteeIndex:
           closureScope:  # Needed for inner `proc`; don't lift it out of loop.
             let idx = subcommitteeIdx
@@ -1511,7 +1511,7 @@ proc installMessageValidators(node: BeaconNode) =
                 MsgSource.gossip, msg)))
 
       when consensusFork >= ConsensusFork.Capella:
-        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/p2p-interface.md#bls_to_execution_change
+        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/p2p-interface.md#bls_to_execution_change
         node.network.addAsyncValidator(
           getBlsToExecutionChangeTopic(digest), proc (
             msg: SignedBLSToExecutionChange
@@ -1522,7 +1522,7 @@ proc installMessageValidators(node: BeaconNode) =
 
       when consensusFork >= ConsensusFork.Deneb:
         # blob_sidecar_{index}
-        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#blob_sidecar_subnet_id
+        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#blob_sidecar_subnet_id
         for i in 0 ..< BLOB_SIDECAR_SUBNET_COUNT:
           closureScope:  # Needed for inner `proc`; don't lift it out of loop.
             let idx = i
diff --git a/beacon_chain/rpc/rest_config_api.nim b/beacon_chain/rpc/rest_config_api.nim
index 6a12fd2c6..077ee4205 100644
--- a/beacon_chain/rpc/rest_config_api.nim
+++ b/beacon_chain/rpc/rest_config_api.nim
@@ -88,7 +88,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           MAX_VOLUNTARY_EXITS:
             Base10.toString(MAX_VOLUNTARY_EXITS),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/altair.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/altair.yaml
           INACTIVITY_PENALTY_QUOTIENT_ALTAIR:
             Base10.toString(INACTIVITY_PENALTY_QUOTIENT_ALTAIR),
           MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR:
@@ -104,7 +104,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           UPDATE_TIMEOUT:
             Base10.toString(UPDATE_TIMEOUT),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/bellatrix.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/bellatrix.yaml
           INACTIVITY_PENALTY_QUOTIENT_BELLATRIX:
             Base10.toString(INACTIVITY_PENALTY_QUOTIENT_BELLATRIX),
           MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX:
@@ -120,7 +120,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           MAX_EXTRA_DATA_BYTES:
             Base10.toString(uint64(MAX_EXTRA_DATA_BYTES)),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/capella.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/capella.yaml
           MAX_BLS_TO_EXECUTION_CHANGES:
             Base10.toString(uint64(MAX_BLS_TO_EXECUTION_CHANGES)),
           MAX_WITHDRAWALS_PER_PAYLOAD:
@@ -259,7 +259,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           ATTESTATION_SUBNET_COUNT:
             Base10.toString(ATTESTATION_SUBNET_COUNT),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#constants
+          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#constants
           TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE:
             Base10.toString(uint64(TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE)),
           SYNC_COMMITTEE_SUBNET_COUNT:
diff --git a/beacon_chain/spec/beacon_time.nim b/beacon_chain/spec/beacon_time.nim
index 7d233729b..e2ed34a7a 100644
--- a/beacon_chain/spec/beacon_time.nim
+++ b/beacon_chain/spec/beacon_time.nim
@@ -43,7 +43,7 @@ const
   GENESIS_SLOT* = Slot(0)
   GENESIS_EPOCH* = Epoch(0) # compute_epoch_at_slot(GENESIS_SLOT)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#constant
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#constant
   INTERVALS_PER_SLOT* = 3
 
   FAR_FUTURE_BEACON_TIME* = BeaconTime(ns_since_genesis: int64.high())
@@ -134,22 +134,22 @@ template `+`*(a: TimeDiff, b: Duration): TimeDiff =
 const
   # Offsets from the start of the slot to when the corresponding message should
   # be sent
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#attesting
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#attesting
   attestationSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#broadcast-aggregate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#broadcast-aggregate
   aggregateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  * 2 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#prepare-sync-committee-message
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#prepare-sync-committee-message
   syncCommitteeMessageSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#broadcast-sync-committee-contribution
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#broadcast-sync-committee-contribution
   syncContributionSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  * 2 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#sync-committee
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#sync-committee
   lightClientFinalityUpdateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#sync-committee
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#sync-committee
   lightClientOptimisticUpdateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
 
@@ -189,7 +189,7 @@ func epoch*(slot: Slot): Epoch = # aka compute_epoch_at_slot
   if slot == FAR_FUTURE_SLOT: FAR_FUTURE_EPOCH
   else: Epoch(slot div SLOTS_PER_EPOCH)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#compute_slots_since_epoch_start
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#compute_slots_since_epoch_start
 func since_epoch_start*(slot: Slot): uint64 = # aka compute_slots_since_epoch_start
   ## How many slots since the beginning of the epoch (`[0..SLOTS_PER_EPOCH-1]`)
   (slot mod SLOTS_PER_EPOCH)
@@ -217,7 +217,7 @@ iterator slots*(epoch: Epoch): Slot =
   for slot in start_slot ..< start_slot + SLOTS_PER_EPOCH:
     yield slot
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#sync-committee
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#sync-committee
 template sync_committee_period*(epoch: Epoch): SyncCommitteePeriod =
   if epoch == FAR_FUTURE_EPOCH: FAR_FUTURE_PERIOD
   else: SyncCommitteePeriod(epoch div EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
diff --git a/beacon_chain/spec/beaconstate.nim b/beacon_chain/spec/beaconstate.nim
index a8388e043..d62059063 100644
--- a/beacon_chain/spec/beaconstate.nim
+++ b/beacon_chain/spec/beaconstate.nim
@@ -22,7 +22,7 @@ from ./datatypes/capella import BeaconState, ExecutionPayloadHeader, Withdrawal
 
 export extras, forks, validator, chronicles
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#increase_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#increase_balance
 func increase_balance*(balance: var Gwei, delta: Gwei) =
   balance += delta
 
@@ -32,7 +32,7 @@ func increase_balance*(
   if delta != 0: # avoid dirtying the balance cache if not needed
     increase_balance(state.balances.mitem(index), delta)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#decrease_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#decrease_balance
 func decrease_balance*(balance: var Gwei, delta: Gwei) =
   balance =
     if delta > balance:
@@ -72,7 +72,7 @@ func compute_activation_exit_epoch*(epoch: Epoch): Epoch =
   ## ``epoch`` take effect.
   epoch + 1 + MAX_SEED_LOOKAHEAD
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_validator_churn_limit
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_validator_churn_limit
 func get_validator_churn_limit*(
       cfg: RuntimeConfig, state: ForkyBeaconState, cache: var StateCache):
     uint64 =
@@ -134,8 +134,8 @@ func initiate_validator_exit*(
 from ./datatypes/deneb import BeaconState
 
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#modified-slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 func get_slashing_penalty*(state: ForkyBeaconState,
                            validator_effective_balance: Gwei): Gwei =
   # TODO Consider whether this is better than splitting the functions apart; in
@@ -150,9 +150,9 @@ func get_slashing_penalty*(state: ForkyBeaconState,
   else:
     {.fatal: "invalid BeaconState type".}
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#modified-slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 func get_whistleblower_reward*(validator_effective_balance: Gwei): Gwei =
   validator_effective_balance div WHISTLEBLOWER_REWARD_QUOTIENT
 
@@ -168,9 +168,9 @@ func get_proposer_reward(state: ForkyBeaconState, whistleblower_reward: Gwei): G
   else:
     {.fatal: "invalid BeaconState type".}
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#modified-slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 proc slash_validator*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
     slashed_index: ValidatorIndex, cache: var StateCache):
@@ -380,7 +380,7 @@ proc is_valid_indexed_attestation*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_attesting_indices
 iterator get_attesting_indices_iter*(state: ForkyBeaconState,
                                      data: AttestationData,
                                      bits: CommitteeValidatorsBits,
@@ -401,7 +401,7 @@ iterator get_attesting_indices_iter*(state: ForkyBeaconState,
       if bits[index_in_committee]:
         yield validator_index
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_attesting_indices
 func get_attesting_indices*(state: ForkyBeaconState,
                             data: AttestationData,
                             bits: CommitteeValidatorsBits,
@@ -471,8 +471,8 @@ func check_attestation_target_epoch(
 
   ok(data.target.epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#attestations
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#modified-process_attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#attestations
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#modified-process_attestation
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/beacon-chain.md#modified-process_attestation
 func check_attestation_inclusion(
     consensusFork: static ConsensusFork, attestation_slot: Slot,
@@ -502,7 +502,7 @@ func check_attestation_index*(
     Result[CommitteeIndex, cstring] =
   check_attestation_index(data.index, committees_per_slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#get_attestation_participation_flag_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#get_attestation_participation_flag_indices
 func get_attestation_participation_flag_indices(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState,
     data: AttestationData, inclusion_delay: uint64): set[TimelyFlag] =
@@ -574,7 +574,7 @@ func get_attestation_participation_flag_indices(
 # TODO these duplicate some stuff in state_transition_epoch which uses TotalBalances
 # better to centralize around that if feasible
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_total_active_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_total_active_balance
 func get_total_active_balance*(state: ForkyBeaconState, cache: var StateCache): Gwei =
   ## Return the combined effective balance of the active validators.
   ## Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei
@@ -590,7 +590,7 @@ func get_total_active_balance*(state: ForkyBeaconState, cache: var StateCache):
     cache.total_active_balance[epoch] = tab
     return tab
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#get_base_reward_per_increment
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#get_base_reward_per_increment
 func get_base_reward_per_increment_sqrt*(
     total_active_balance_sqrt: uint64): Gwei =
   EFFECTIVE_BALANCE_INCREMENT * BASE_REWARD_FACTOR div total_active_balance_sqrt
@@ -599,7 +599,7 @@ func get_base_reward_per_increment*(
     total_active_balance: Gwei): Gwei =
   get_base_reward_per_increment_sqrt(integer_squareroot(total_active_balance))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#get_base_reward
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#get_base_reward
 func get_base_reward(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
            deneb.BeaconState,
@@ -610,7 +610,7 @@ func get_base_reward(
     state.validators[index].effective_balance div EFFECTIVE_BALANCE_INCREMENT
   increments * base_reward_per_increment
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#attestations
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#attestations
 proc check_attestation*(
     state: ForkyBeaconState, attestation: SomeAttestation, flags: UpdateFlags,
     cache: var StateCache): Result[void, cstring] =
@@ -789,7 +789,7 @@ func get_next_sync_committee_keys(
     i += 1'u64
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#has_eth1_withdrawal_credential
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#has_eth1_withdrawal_credential
 func has_eth1_withdrawal_credential*(validator: Validator): bool =
   ## Check if ``validator`` has an 0x01 prefixed "eth1" withdrawal credential.
   validator.withdrawal_credentials.data[0] == ETH1_ADDRESS_WITHDRAWAL_PREFIX
@@ -1108,7 +1108,7 @@ proc initialize_hashed_beacon_state_from_eth1*(
       execution_payload_header, flags))
   result.root = hash_tree_root(result.data)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/fork.md#upgrading-the-state
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/fork.md#upgrading-the-state
 func translate_participation(
     state: var altair.BeaconState,
     pending_attestations: openArray[phase0.PendingAttestation]) =
@@ -1194,7 +1194,7 @@ func upgrade_to_altair*(cfg: RuntimeConfig, pre: phase0.BeaconState):
 
   post
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/fork.md#upgrading-the-state
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/fork.md#upgrading-the-state
 func upgrade_to_bellatrix*(cfg: RuntimeConfig, pre: altair.BeaconState):
     ref bellatrix.BeaconState =
   let epoch = get_current_epoch(pre)
@@ -1251,7 +1251,7 @@ func upgrade_to_bellatrix*(cfg: RuntimeConfig, pre: altair.BeaconState):
     latest_execution_payload_header: default(bellatrix.ExecutionPayloadHeader)
   )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/fork.md#upgrading-the-state
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/fork.md#upgrading-the-state
 func upgrade_to_capella*(cfg: RuntimeConfig, pre: bellatrix.BeaconState):
     ref capella.BeaconState =
   let
diff --git a/beacon_chain/spec/crypto.nim b/beacon_chain/spec/crypto.nim
index b5b1eaa06..8bf6897c4 100644
--- a/beacon_chain/spec/crypto.nim
+++ b/beacon_chain/spec/crypto.nim
@@ -206,7 +206,7 @@ func finish*(agg: AggregateSignature): CookedSig {.inline.} =
   sig.finish(agg)
   CookedSig(sig)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#bls-signatures
 func blsVerify*(
     pubkey: CookedPubKey, message: openArray[byte],
     signature: CookedSig): bool =
@@ -219,7 +219,7 @@ func blsVerify*(
   ## to enforce correct usage.
   PublicKey(pubkey).verify(message, blscurve.Signature(signature))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#bls-signatures
 proc blsVerify*(
     pubkey: ValidatorPubKey, message: openArray[byte],
     signature: CookedSig): bool =
diff --git a/beacon_chain/spec/datatypes/altair.nim b/beacon_chain/spec/datatypes/altair.nim
index 54b292135..372f777c3 100644
--- a/beacon_chain/spec/datatypes/altair.nim
+++ b/beacon_chain/spec/datatypes/altair.nim
@@ -51,16 +51,16 @@ const
   PARTICIPATION_FLAG_WEIGHTS*: array[TimelyFlag, uint64] =
     [uint64 TIMELY_SOURCE_WEIGHT, TIMELY_TARGET_WEIGHT, TIMELY_HEAD_WEIGHT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#misc
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#misc
   TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE* = 16
   SYNC_COMMITTEE_SUBNET_COUNT* = 4
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#constants
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#constants
   # All of these indices are rooted in `BeaconState`.
   # The first member (`genesis_time`) is 32, subsequent members +1 each.
   # If there are ever more than 32 members in `BeaconState`, indices change!
   # `FINALIZED_ROOT_INDEX` is one layer deeper, i.e., `52 * 2 + 1`.
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/ssz/merkle-proofs.md
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/ssz/merkle-proofs.md
   FINALIZED_ROOT_INDEX* = 105.GeneralizedIndex # `finalized_checkpoint` > `root`
   CURRENT_SYNC_COMMITTEE_INDEX* = 54.GeneralizedIndex # `current_sync_committee`
   NEXT_SYNC_COMMITTEE_INDEX* = 55.GeneralizedIndex # `next_sync_committee`
@@ -88,7 +88,7 @@ type
     ## effectively making the cost of clearing the cache higher than the typical
     ## gains
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#syncaggregate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#syncaggregate
   SyncAggregate* = object
     sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
     sync_committee_signature*: ValidatorSig
@@ -102,7 +102,7 @@ type
     pubkeys*: HashArray[Limit SYNC_COMMITTEE_SIZE, ValidatorPubKey]
     aggregate_pubkey*: ValidatorPubKey
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#synccommitteemessage
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#synccommitteemessage
   SyncCommitteeMessage* = object
     slot*: Slot
       ## Slot to which this contribution pertains
@@ -116,7 +116,7 @@ type
     signature*: ValidatorSig
       ## Signature by the validator over the block root of `slot`
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#synccommitteecontribution
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#synccommitteecontribution
   SyncCommitteeAggregationBits* =
     BitArray[SYNC_SUBCOMMITTEE_SIZE]
 
@@ -138,18 +138,18 @@ type
     signature*: ValidatorSig
       ## Signature by the validator(s) over the block root of `slot`
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#contributionandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#contributionandproof
   ContributionAndProof* = object
     aggregator_index*: uint64 # `ValidatorIndex` after validation
     contribution*: SyncCommitteeContribution
     selection_proof*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#signedcontributionandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#signedcontributionandproof
   SignedContributionAndProof* = object
     message*: ContributionAndProof
     signature*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#syncaggregatorselectiondata
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#syncaggregatorselectiondata
   SyncAggregatorSelectionData* = object
     slot*: Slot
     subcommittee_index*: uint64 # `SyncSubcommitteeIndex` after validation
@@ -165,12 +165,12 @@ type
   NextSyncCommitteeBranch* =
     array[log2trunc(NEXT_SYNC_COMMITTEE_INDEX), Eth2Digest]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientheader
   LightClientHeader* = object
     beacon*: BeaconBlockHeader
       ## Beacon block header
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
   LightClientBootstrap* = object
     header*: LightClientHeader
       ## Header matching the requested beacon block root
@@ -179,7 +179,7 @@ type
       ## Current sync committee corresponding to `header.beacon.state_root`
     current_sync_committee_branch*: CurrentSyncCommitteeBranch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientupdate
   LightClientUpdate* = object
     attested_header*: LightClientHeader
       ## Header attested to by the sync committee
@@ -198,7 +198,7 @@ type
     signature_slot*: Slot
       ## Slot at which the aggregate signature was created (untrusted)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
   LightClientFinalityUpdate* = object
     # Header attested to by the sync committee
     attested_header*: LightClientHeader
@@ -212,7 +212,7 @@ type
     # Slot at which the aggregate signature was created (untrusted)
     signature_slot*: Slot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
   LightClientOptimisticUpdate* = object
     # Header attested to by the sync committee
     attested_header*: LightClientHeader
@@ -238,7 +238,7 @@ type
     LightClientBootstrap |
     SomeLightClientUpdate
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientstore
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientstore
   LightClientStore* = object
     finalized_header*: LightClientHeader
       ## Header that is finalized
@@ -347,7 +347,7 @@ type
     data*: BeaconState
     root*: Eth2Digest # hash_tree_root(data)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconblock
   BeaconBlock* = object
     ## For each slot, a proposer is chosen from the validator pool to propose
     ## a new block. Once the block as been proposed, it is transmitted to
@@ -404,7 +404,7 @@ type
     state_root*: Eth2Digest
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data
@@ -456,7 +456,7 @@ type
 
   SyncnetBits* = BitArray[SYNC_COMMITTEE_SUBNET_COUNT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#metadata
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#metadata
   MetaData* = object
     seq_number*: uint64
     attnets*: AttnetBits
@@ -659,7 +659,7 @@ chronicles.formatIt SyncCommitteeContribution: shortLog(it)
 chronicles.formatIt ContributionAndProof: shortLog(it)
 chronicles.formatIt SignedContributionAndProof: shortLog(it)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#is_valid_light_client_header
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#is_valid_light_client_header
 func is_valid_light_client_header*(
     header: LightClientHeader, cfg: RuntimeConfig): bool =
   true
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index 5b71de4d8..3ef781d2a 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -82,7 +82,7 @@ const
   ZERO_HASH* = Eth2Digest()
   MAX_GRAFFITI_SIZE* = 32
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#configuration
   MAXIMUM_GOSSIP_CLOCK_DISPARITY* = 500.millis
 
   SLOTS_PER_ETH1_VOTING_PERIOD* =
@@ -191,7 +191,7 @@ type
   # SSZ / hashing purposes
   JustificationBits* = distinct uint8
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#proposerslashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#proposerslashing
   ProposerSlashing* = object
     signed_header_1*: SignedBeaconBlockHeader
     signed_header_2*: SignedBeaconBlockHeader
@@ -203,7 +203,7 @@ type
     signed_header_1*: TrustedSignedBeaconBlockHeader
     signed_header_2*: TrustedSignedBeaconBlockHeader
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#attesterslashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#attesterslashing
   AttesterSlashing* = object
     attestation_1*: IndexedAttestation
     attestation_2*: IndexedAttestation
@@ -215,7 +215,7 @@ type
     attestation_1*: TrustedIndexedAttestation
     attestation_2*: TrustedIndexedAttestation
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#indexedattestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#indexedattestation
   IndexedAttestation* = object
     attesting_indices*: List[uint64, Limit MAX_VALIDATORS_PER_COMMITTEE]
     data*: AttestationData
@@ -231,7 +231,7 @@ type
 
   CommitteeValidatorsBits* = BitList[Limit MAX_VALIDATORS_PER_COMMITTEE]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#attestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#attestation
   Attestation* = object
     aggregation_bits*: CommitteeValidatorsBits
     data*: AttestationData
@@ -270,7 +270,7 @@ type
     source*: Checkpoint
     target*: Checkpoint
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#deposit
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#deposit
   Deposit* = object
     proof*: array[DEPOSIT_CONTRACT_TREE_DEPTH + 1, Eth2Digest]
       ## Merkle path to deposit root
@@ -321,7 +321,7 @@ type
     pubkey*: CookedPubKey
     withdrawal_credentials*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#validator
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#validator
   Validator* = object
     pubkey*: ValidatorPubKey
 
@@ -352,7 +352,7 @@ type
 
     proposer_index*: uint64 # `ValidatorIndex` after validation
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#historicalbatch
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#historicalbatch
   HistoricalBatch* = object
     block_roots* : array[SLOTS_PER_HISTORICAL_ROOT, Eth2Digest]
     state_roots* : array[SLOTS_PER_HISTORICAL_ROOT, Eth2Digest]
@@ -371,7 +371,7 @@ type
     deposit_count*: uint64
     block_hash*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#signedvoluntaryexit
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#signedvoluntaryexit
   SignedVoluntaryExit* = object
     message*: VoluntaryExit
     signature*: ValidatorSig
@@ -388,7 +388,7 @@ type
     state_root*: Eth2Digest
     body_root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#signingdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#signingdata
   SigningData* = object
     object_root*: Eth2Digest
     domain*: Eth2Domain
@@ -404,13 +404,13 @@ type
     message*: BeaconBlockHeader
     signature*: TrustedSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#aggregateandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#aggregateandproof
   AggregateAndProof* = object
     aggregator_index*: uint64 # `ValidatorIndex` after validation
     aggregate*: Attestation
     selection_proof*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#signedaggregateandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#signedaggregateandproof
   SignedAggregateAndProof* = object
     message*: AggregateAndProof
     signature*: ValidatorSig
@@ -428,7 +428,7 @@ type
     sync_committees*: Table[SyncCommitteePeriod, SyncCommitteeCache]
 
   # This matches the mutable state of the Solidity deposit contract
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/solidity_deposit_contract/deposit_contract.sol
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/solidity_deposit_contract/deposit_contract.sol
   DepositContractState* = object
     branch*: array[DEPOSIT_CONTRACT_TREE_DEPTH, Eth2Digest]
     deposit_count*: array[32, byte] # Uint256
@@ -459,7 +459,7 @@ type
     withdrawable_epoch*: Epoch
       ## When validator can withdraw funds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#validator
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#validator
   ValidatorStatusCapella* = object
     # This is a validator without the expensive, immutable, append-only parts
     # serialized. They're represented in memory to allow in-place SSZ reading
diff --git a/beacon_chain/spec/datatypes/bellatrix.nim b/beacon_chain/spec/datatypes/bellatrix.nim
index 05dfc89d5..a6ec8b248 100644
--- a/beacon_chain/spec/datatypes/bellatrix.nim
+++ b/beacon_chain/spec/datatypes/bellatrix.nim
@@ -34,7 +34,7 @@ const
   NEWPAYLOAD_TIMEOUT* = 8.seconds
 
 type
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#custom-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#custom-types
   Transaction* = List[byte, Limit MAX_BYTES_PER_TRANSACTION]
 
   ExecutionAddress* = object
@@ -45,7 +45,7 @@ type
 
   PayloadID* = array[8, byte]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#executionpayload
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#executionpayload
   ExecutionPayload* = object
     # Execution block header fields
     parent_hash*: Eth2Digest
@@ -73,7 +73,7 @@ type
     executionPayload*: ExecutionPayload
     blockValue*: Wei
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#executionpayloadheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#executionpayloadheader
   ExecutionPayloadHeader* = object
     # Execution block header fields
     parent_hash*: Eth2Digest
@@ -97,13 +97,13 @@ type
   ExecutePayload* = proc(
     execution_payload: ExecutionPayload): bool {.gcsafe, raises: [Defect].}
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/fork-choice.md#powblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/fork-choice.md#powblock
   PowBlock* = object
     block_hash*: Eth2Digest
     parent_hash*: Eth2Digest
     total_difficulty*: Eth2Digest   # uint256
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#beaconstate
   BeaconState* = object
     # Versioning
     genesis_time*: uint64
@@ -228,7 +228,7 @@ type
     state_root*: Eth2Digest
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data
@@ -306,7 +306,7 @@ type
     # Execution
     execution_payload*: ExecutionPayload  # [New in Bellatrix]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#signedbeaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#signedbeaconblock
   SignedBeaconBlock* = object
     message*: BeaconBlock
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/datatypes/capella.nim b/beacon_chain/spec/datatypes/capella.nim
index 9488caefa..22ed48cbc 100644
--- a/beacon_chain/spec/datatypes/capella.nim
+++ b/beacon_chain/spec/datatypes/capella.nim
@@ -27,43 +27,43 @@ import
 export json_serialization, base
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#constants
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#constants
   # This index is rooted in `BeaconBlockBody`.
   # The first member (`randao_reveal`) is 16, subsequent members +1 each.
   # If there are ever more than 16 members in `BeaconBlockBody`, indices change!
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/ssz/merkle-proofs.md
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/ssz/merkle-proofs.md
   EXECUTION_PAYLOAD_INDEX* = 25.GeneralizedIndex # `execution_payload`
 
 type
   SignedBLSToExecutionChangeList* =
     List[SignedBLSToExecutionChange, Limit MAX_BLS_TO_EXECUTION_CHANGES]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#withdrawal
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#withdrawal
   Withdrawal* = object
     index*: WithdrawalIndex
     validator_index*: uint64
     address*: ExecutionAddress
     amount*: Gwei
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#blstoexecutionchange
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#blstoexecutionchange
   BLSToExecutionChange* = object
     validator_index*: uint64
     from_bls_pubkey*: ValidatorPubKey
     to_execution_address*: ExecutionAddress
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#signedblstoexecutionchange
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#signedblstoexecutionchange
   SignedBLSToExecutionChange* = object
     message*: BLSToExecutionChange
     signature*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#historicalsummary
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#historicalsummary
   HistoricalSummary* = object
     # `HistoricalSummary` matches the components of the phase0
     # `HistoricalBatch` making the two hash_tree_root-compatible.
     block_summary_root*: Eth2Digest
     state_summary_root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#executionpayload
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#executionpayload
   ExecutionPayload* = object
     # Execution block header fields
     parent_hash*: Eth2Digest
@@ -93,7 +93,7 @@ type
     executionPayload*: ExecutionPayload
     blockValue*: Wei
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#executionpayloadheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#executionpayloadheader
   ExecutionPayloadHeader* = object
     # Execution block header fields
     parent_hash*: Eth2Digest
@@ -122,7 +122,7 @@ type
   ExecutionBranch* =
     array[log2trunc(EXECUTION_PAYLOAD_INDEX), Eth2Digest]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
   LightClientHeader* = object
     beacon*: BeaconBlockHeader
       ## Beacon block header
@@ -131,7 +131,7 @@ type
       ## Execution payload header corresponding to `beacon.body_root` (from Capella onward)
     execution_branch*: ExecutionBranch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
   LightClientBootstrap* = object
     header*: LightClientHeader
       ## Header matching the requested beacon block root
@@ -140,7 +140,7 @@ type
       ## Current sync committee corresponding to `header.beacon.state_root`
     current_sync_committee_branch*: altair.CurrentSyncCommitteeBranch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientupdate
   LightClientUpdate* = object
     attested_header*: LightClientHeader
       ## Header attested to by the sync committee
@@ -159,7 +159,7 @@ type
     signature_slot*: Slot
       ## Slot at which the aggregate signature was created (untrusted)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
   LightClientFinalityUpdate* = object
     # Header attested to by the sync committee
     attested_header*: LightClientHeader
@@ -173,7 +173,7 @@ type
     # Slot at which the aggregate signature was created (untrusted)
     signature_slot*: Slot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
   LightClientOptimisticUpdate* = object
     # Header attested to by the sync committee
     attested_header*: LightClientHeader
@@ -199,7 +199,7 @@ type
     LightClientBootstrap |
     SomeLightClientUpdate
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientstore
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientstore
   LightClientStore* = object
     finalized_header*: LightClientHeader
       ## Header that is finalized
@@ -220,7 +220,7 @@ type
       ## (used to compute safety threshold)
     current_max_active_participants*: uint64
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#beaconstate
   BeaconState* = object
     # Versioning
     genesis_time*: uint64
@@ -650,7 +650,7 @@ func shortLog*(v: SignedBLSToExecutionChange): auto =
     signature: shortLog(v.signature)
   )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#get_lc_execution_root
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#get_lc_execution_root
 func get_lc_execution_root*(
     header: LightClientHeader, cfg: RuntimeConfig): Eth2Digest =
   let epoch = header.beacon.slot.epoch
@@ -660,7 +660,7 @@ func get_lc_execution_root*(
 
   ZERO_HASH
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#modified-is_valid_light_client_header
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#modified-is_valid_light_client_header
 func is_valid_light_client_header*(
     header: LightClientHeader, cfg: RuntimeConfig): bool =
   let epoch = header.beacon.slot.epoch
@@ -677,13 +677,13 @@ func is_valid_light_client_header*(
     get_subtree_index(EXECUTION_PAYLOAD_INDEX),
     header.beacon.body_root)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/fork.md#upgrading-light-client-data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/fork.md#upgrading-light-client-data
 func upgrade_lc_header_to_capella*(
     pre: altair.LightClientHeader): LightClientHeader =
   LightClientHeader(
     beacon: pre.beacon)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/fork.md#upgrading-light-client-data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/fork.md#upgrading-light-client-data
 func upgrade_lc_bootstrap_to_capella*(
     pre: altair.LightClientBootstrap): LightClientBootstrap =
   LightClientBootstrap(
@@ -691,7 +691,7 @@ func upgrade_lc_bootstrap_to_capella*(
     current_sync_committee: pre.current_sync_committee,
     current_sync_committee_branch: pre.current_sync_committee_branch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/fork.md#upgrading-light-client-data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/fork.md#upgrading-light-client-data
 func upgrade_lc_update_to_capella*(
     pre: altair.LightClientUpdate): LightClientUpdate =
   LightClientUpdate(
@@ -703,7 +703,7 @@ func upgrade_lc_update_to_capella*(
     sync_aggregate: pre.sync_aggregate,
     signature_slot: pre.signature_slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/fork.md#upgrading-light-client-data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/fork.md#upgrading-light-client-data
 func upgrade_lc_finality_update_to_capella*(
     pre: altair.LightClientFinalityUpdate): LightClientFinalityUpdate =
   LightClientFinalityUpdate(
@@ -713,7 +713,7 @@ func upgrade_lc_finality_update_to_capella*(
     sync_aggregate: pre.sync_aggregate,
     signature_slot: pre.signature_slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/fork.md#upgrading-light-client-data
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/fork.md#upgrading-light-client-data
 func upgrade_lc_optimistic_update_to_capella*(
     pre: altair.LightClientOptimisticUpdate): LightClientOptimisticUpdate =
   LightClientOptimisticUpdate(
@@ -764,7 +764,7 @@ chronicles.formatIt LightClientUpdate: shortLog(it)
 chronicles.formatIt LightClientFinalityUpdate: shortLog(it)
 chronicles.formatIt LightClientOptimisticUpdate: shortLog(it)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/fork.md#upgrading-the-store
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/fork.md#upgrading-the-store
 func upgrade_lc_store_to_capella*(
     pre: altair.LightClientStore): LightClientStore =
   let best_valid_update =
diff --git a/beacon_chain/spec/datatypes/constants.nim b/beacon_chain/spec/datatypes/constants.nim
index 4f5ebf2c9..c61f18e02 100644
--- a/beacon_chain/spec/datatypes/constants.nim
+++ b/beacon_chain/spec/datatypes/constants.nim
@@ -16,10 +16,10 @@ type
   DomainType* = distinct array[4, byte]
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#constants
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#constants
   NODE_ID_BITS* = 256
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#configuration
   EPOCHS_PER_SUBNET_SUBSCRIPTION* = 256
   SUBNETS_PER_NODE* = 2'u64
   ATTESTATION_SUBNET_COUNT*: uint64 = 64
@@ -51,7 +51,7 @@ const
   DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF* = DomainType([byte 0x08, 0x00, 0x00, 0x00])
   DOMAIN_CONTRIBUTION_AND_PROOF* = DomainType([byte 0x09, 0x00, 0x00, 0x00])
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#domain-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#domain-types
   DOMAIN_BLS_TO_EXECUTION_CHANGE* = DomainType([byte 0x0a, 0x00, 0x00, 0x00])
 
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/beacon-chain.md#domain-types
@@ -60,8 +60,8 @@ const
   # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/beacon-chain.md#transition-settings
   TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH* = FAR_FUTURE_EPOCH
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/fork-choice.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#configuration
   PROPOSER_SCORE_BOOST*: uint64 = 40
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/p2p-interface.md#configuration
   BLOB_SIDECAR_SUBNET_COUNT*: uint64 = 6
diff --git a/beacon_chain/spec/datatypes/deneb.nim b/beacon_chain/spec/datatypes/deneb.nim
index 8854de4f2..38c24695b 100644
--- a/beacon_chain/spec/datatypes/deneb.nim
+++ b/beacon_chain/spec/datatypes/deneb.nim
@@ -30,7 +30,7 @@ from kzg4844 import KzgCommitment, KzgProof
 export json_serialization, base, kzg4844
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/polynomial-commitments.md#constants
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/polynomial-commitments.md#constants
   BYTES_PER_FIELD_ELEMENT = 32
 
   # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#blob
@@ -139,7 +139,7 @@ type
   ExecutePayload* = proc(
     execution_payload: ExecutionPayload): bool {.gcsafe, raises: [Defect].}
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/sync-protocol.md#modified-lightclientheader
   LightClientHeader* = object
     beacon*: BeaconBlockHeader
       ## Beacon block header
@@ -148,7 +148,7 @@ type
       ## Execution payload header corresponding to `beacon.body_root` (from Capella onward)
     execution_branch*: capella.ExecutionBranch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
   LightClientBootstrap* = object
     header*: LightClientHeader
       ## Header matching the requested beacon block root
@@ -157,7 +157,7 @@ type
       ## Current sync committee corresponding to `header.beacon.state_root`
     current_sync_committee_branch*: altair.CurrentSyncCommitteeBranch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientupdate
   LightClientUpdate* = object
     attested_header*: LightClientHeader
       ## Header attested to by the sync committee
@@ -176,7 +176,7 @@ type
     signature_slot*: Slot
       ## Slot at which the aggregate signature was created (untrusted)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
   LightClientFinalityUpdate* = object
     # Header attested to by the sync committee
     attested_header*: LightClientHeader
@@ -190,7 +190,7 @@ type
     # Slot at which the aggregate signature was created (untrusted)
     signature_slot*: Slot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
   LightClientOptimisticUpdate* = object
     # Header attested to by the sync committee
     attested_header*: LightClientHeader
@@ -216,7 +216,7 @@ type
     LightClientBootstrap |
     SomeLightClientUpdate
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#lightclientstore
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#lightclientstore
   LightClientStore* = object
     finalized_header*: LightClientHeader
       ## Header that is finalized
@@ -315,7 +315,7 @@ type
     data*: BeaconState
     root*: Eth2Digest # hash_tree_root(data)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconblock
   BeaconBlock* = object
     ## For each slot, a proposer is chosen from the validator pool to propose
     ## a new block. Once the block as been proposed, it is transmitted to
diff --git a/beacon_chain/spec/datatypes/phase0.nim b/beacon_chain/spec/datatypes/phase0.nim
index 6bb3daead..2b12ca6d6 100644
--- a/beacon_chain/spec/datatypes/phase0.nim
+++ b/beacon_chain/spec/datatypes/phase0.nim
@@ -111,7 +111,7 @@ type
     data*: BeaconState
     root*: Eth2Digest # hash_tree_root(data)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconblock
   BeaconBlock* = object
     ## For each slot, a proposer is chosen from the validator pool to propose
     ## a new block. Once the block as been proposed, it is transmitted to
@@ -167,7 +167,7 @@ type
     state_root*: Eth2Digest
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data
@@ -219,7 +219,7 @@ type
     deposits*: List[Deposit, Limit MAX_DEPOSITS]
     voluntary_exits*: List[TrustedSignedVoluntaryExit, Limit MAX_VOLUNTARY_EXITS]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#signedbeaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#signedbeaconblock
   SignedBeaconBlock* = object
     message*: BeaconBlock
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/eth2_apis/rest_types.nim b/beacon_chain/spec/eth2_apis/rest_types.nim
index c901150f5..a0f7a5a16 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -377,7 +377,7 @@ type
     MAX_DEPOSITS*: uint64
     MAX_VOLUNTARY_EXITS*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/altair.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/altair.yaml
     INACTIVITY_PENALTY_QUOTIENT_ALTAIR*: uint64
     MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR*: uint64
     PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR*: uint64
@@ -386,7 +386,7 @@ type
     MIN_SYNC_COMMITTEE_PARTICIPANTS*: uint64
     UPDATE_TIMEOUT*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/bellatrix.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/bellatrix.yaml
     INACTIVITY_PENALTY_QUOTIENT_BELLATRIX*: uint64
     MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX*: uint64
     PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX*: uint64
@@ -395,7 +395,7 @@ type
     BYTES_PER_LOGS_BLOOM*: uint64
     MAX_EXTRA_DATA_BYTES*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/capella.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/capella.yaml
     MAX_BLS_TO_EXECUTION_CHANGES*: uint64
     MAX_WITHDRAWALS_PER_PAYLOAD*: uint64
     MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP*: uint64
@@ -475,7 +475,7 @@ type
     EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION*: uint64
     ATTESTATION_SUBNET_COUNT*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#constants
     TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE*: uint64
     SYNC_COMMITTEE_SUBNET_COUNT*: uint64
 
diff --git a/beacon_chain/spec/forks_light_client.nim b/beacon_chain/spec/forks_light_client.nim
index 4e320599f..561b7597a 100644
--- a/beacon_chain/spec/forks_light_client.nim
+++ b/beacon_chain/spec/forks_light_client.nim
@@ -816,7 +816,7 @@ func migratingToDataFork*[
   upgradedObject.migrateToDataFork(newKind)
   upgradedObject
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/full-node.md#block_to_light_client_header
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/full-node.md#block_to_light_client_header
 func toAltairLightClientHeader(
     blck:  # `SomeSignedBeaconBlock` doesn't work here (Nim 1.6)
       phase0.SignedBeaconBlock | phase0.TrustedSignedBeaconBlock |
@@ -826,7 +826,7 @@ func toAltairLightClientHeader(
   altair.LightClientHeader(
     beacon: blck.message.toBeaconBlockHeader())
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/light-client/full-node.md#modified-block_to_light_client_header
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/light-client/full-node.md#modified-block_to_light_client_header
 func toCapellaLightClientHeader(
     blck:  # `SomeSignedBeaconBlock` doesn't work here (Nim 1.6)
       phase0.SignedBeaconBlock | phase0.TrustedSignedBeaconBlock |
diff --git a/beacon_chain/spec/helpers.nim b/beacon_chain/spec/helpers.nim
index 01dd01ac0..34c33aea1 100644
--- a/beacon_chain/spec/helpers.nim
+++ b/beacon_chain/spec/helpers.nim
@@ -27,7 +27,7 @@ export
   eth2_merkleization, forks, rlp, ssz_codec
 
 func toEther*(gwei: Gwei): Ether =
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/weak-subjectivity.md#constants
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/weak-subjectivity.md#constants
   const ETH_TO_GWEI = 1_000_000_000
   (gwei div ETH_TO_GWEI).Ether
 
@@ -48,7 +48,7 @@ func shortLog*(v: FinalityCheckpoints): auto =
 
 chronicles.formatIt FinalityCheckpoints: it.shortLog
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#integer_squareroot
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#integer_squareroot
 func integer_squareroot*(n: SomeInteger): SomeInteger =
   ## Return the largest integer ``x`` such that ``x**2 <= n``.
   doAssert n >= 0'u64
@@ -115,7 +115,7 @@ func get_previous_epoch*(
   ## Return the previous epoch (unless the current epoch is ``GENESIS_EPOCH``).
   get_previous_epoch(get_current_epoch(state))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_randao_mix
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_randao_mix
 func get_randao_mix*(state: ForkyBeaconState, epoch: Epoch): Eth2Digest =
   ## Return the randao mix at a recent ``epoch``.
   state.randao_mixes[epoch mod EPOCHS_PER_HISTORICAL_VECTOR]
@@ -137,7 +137,7 @@ func uint_to_bytes*(x: uint32): array[4, byte] = toBytesLE(x)
 func uint_to_bytes*(x: uint16): array[2, byte] = toBytesLE(x)
 func uint_to_bytes*(x: uint8): array[1, byte] = toBytesLE(x)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#compute_domain
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#compute_domain
 func compute_domain*(
     domain_type: DomainType,
     fork_version: Version,
@@ -151,7 +151,7 @@ func compute_domain*(
   result[0..3] = domain_type.data
   result[4..31] = fork_data_root.data.toOpenArray(0, 27)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_domain
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_domain
 func get_domain*(
     fork: Fork,
     domain_type: DomainType,
@@ -210,7 +210,7 @@ func has_flag*(flags: ParticipationFlags, flag_index: TimelyFlag): bool =
   let flag = ParticipationFlags(1'u8 shl ord(flag_index))
   (flags and flag) == flag
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#is_sync_committee_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#is_sync_committee_update
 template is_sync_committee_update*(update: SomeForkyLightClientUpdate): bool =
   when update is SomeForkyLightClientUpdateWithSyncCommittee:
     update.next_sync_committee_branch !=
@@ -218,25 +218,25 @@ template is_sync_committee_update*(update: SomeForkyLightClientUpdate): bool =
   else:
     false
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#is_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#is_finality_update
 template is_finality_update*(update: SomeForkyLightClientUpdate): bool =
   when update is SomeForkyLightClientUpdateWithFinality:
     update.finality_branch != default(typeof(update.finality_branch))
   else:
     false
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
 template is_next_sync_committee_known*(store: ForkyLightClientStore): bool =
   store.next_sync_committee != default(typeof(store.next_sync_committee))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#get_safety_threshold
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#get_safety_threshold
 func get_safety_threshold*(store: ForkyLightClientStore): uint64 =
   max(
     store.previous_max_active_participants,
     store.current_max_active_participants
   ) div 2
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#is_better_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#is_better_update
 type LightClientUpdateMetadata* = object
   attested_slot*, finalized_slot*, signature_slot*: Slot
   has_sync_committee*, has_finality*: bool
@@ -327,24 +327,24 @@ template is_better_update*[
     new_update: A, old_update: B): bool =
   is_better_data(toMeta(new_update), toMeta(old_update))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
 func contextEpoch*(bootstrap: ForkyLightClientBootstrap): Epoch =
   bootstrap.header.beacon.slot.epoch
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
 func contextEpoch*(update: SomeForkyLightClientUpdate): Epoch =
   update.attested_header.beacon.slot.epoch
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#is_merge_transition_complete
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#is_merge_transition_complete
 func is_merge_transition_complete*(
     state: bellatrix.BeaconState | capella.BeaconState | deneb.BeaconState): bool =
   const defaultExecutionPayloadHeader =
     default(typeof(state.latest_execution_payload_header))
   state.latest_execution_payload_header != defaultExecutionPayloadHeader
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/sync/optimistic.md#helpers
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/sync/optimistic.md#helpers
 func is_execution_block*(blck: SomeForkyBeaconBlock): bool =
   when typeof(blck).toFork >= ConsensusFork.Bellatrix:
     const defaultExecutionPayload =
@@ -353,7 +353,7 @@ func is_execution_block*(blck: SomeForkyBeaconBlock): bool =
   else:
     false
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#is_merge_transition_block
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#is_merge_transition_block
 func is_merge_transition_block(
     state: bellatrix.BeaconState | capella.BeaconState | deneb.BeaconState,
     body: bellatrix.BeaconBlockBody | bellatrix.TrustedBeaconBlockBody |
diff --git a/beacon_chain/spec/keystore.nim b/beacon_chain/spec/keystore.nim
index 8d26571f7..1805056ce 100644
--- a/beacon_chain/spec/keystore.nim
+++ b/beacon_chain/spec/keystore.nim
@@ -1366,13 +1366,13 @@ proc createWallet*(kdfKind: KdfKind,
     crypto: crypto,
     nextAccount: nextAccount.get(0))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#bls_withdrawal_prefix
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#bls_withdrawal_prefix
 func makeWithdrawalCredentials*(k: ValidatorPubKey): Eth2Digest =
   var bytes = eth2digest(k.toRaw())
   bytes.data[0] = BLS_WITHDRAWAL_PREFIX.uint8
   bytes
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/deposit-contract.md#withdrawal-credentials
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/deposit-contract.md#withdrawal-credentials
 proc makeWithdrawalCredentials*(k: CookedPubKey): Eth2Digest =
   makeWithdrawalCredentials(k.toPubKey())
 
diff --git a/beacon_chain/spec/light_client_sync.nim b/beacon_chain/spec/light_client_sync.nim
index b054e4a86..36ab003f9 100644
--- a/beacon_chain/spec/light_client_sync.nim
+++ b/beacon_chain/spec/light_client_sync.nim
@@ -15,7 +15,7 @@ import
 from ../consensus_object_pools/block_pools_types import VerifierError
 export block_pools_types.VerifierError
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
 func initialize_light_client_store*(
     trusted_block_root: Eth2Digest,
     bootstrap: ForkyLightClientBootstrap,
@@ -42,7 +42,7 @@ func initialize_light_client_store*(
     current_sync_committee: bootstrap.current_sync_committee,
     optimistic_header: bootstrap.header))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#validate_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#validate_light_client_update
 proc validate_light_client_update*(
     store: ForkyLightClientStore,
     update: SomeForkyLightClientUpdate,
@@ -159,7 +159,7 @@ proc validate_light_client_update*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#apply_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#apply_light_client_update
 func apply_light_client_update(
     store: var ForkyLightClientStore,
     update: SomeForkyLightClientUpdate): bool =
@@ -190,7 +190,7 @@ func apply_light_client_update(
     didProgress = true
   didProgress
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#process_light_client_store_force_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#process_light_client_store_force_update
 type
   ForceUpdateResult* = enum
     NoUpdate,
@@ -223,7 +223,7 @@ func process_light_client_store_force_update*(
     store.best_valid_update.reset()
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#process_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#process_light_client_update
 proc process_light_client_update*(
     store: var ForkyLightClientStore,
     update: SomeForkyLightClientUpdate,
diff --git a/beacon_chain/spec/network.nim b/beacon_chain/spec/network.nim
index 281aa8f97..f8bd612c6 100644
--- a/beacon_chain/spec/network.nim
+++ b/beacon_chain/spec/network.nim
@@ -14,8 +14,8 @@ import
 export base
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#topics-and-messages
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/p2p-interface.md#topics-and-messages
   topicBeaconBlocksSuffix* = "beacon_block/ssz_snappy"
   topicVoluntaryExitsSuffix* = "voluntary_exit/ssz_snappy"
   topicProposerSlashingsSuffix* = "proposer_slashing/ssz_snappy"
@@ -27,7 +27,7 @@ const
   MAX_REQUEST_BLOCKS* = 1024
   RESP_TIMEOUT* = 10.seconds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#configuration
   MAX_REQUEST_LIGHT_CLIENT_UPDATES* = 128
 
   # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/p2p-interface.md#configuration
@@ -68,7 +68,7 @@ func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
 func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
   eth2Prefix(forkDigest) & topicAggregateAndProofsSuffix
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/p2p-interface.md#topics-and-messages
 func getBlsToExecutionChangeTopic*(forkDigest: ForkDigest): string =
   eth2Prefix(forkDigest) & topicBlsToExecutionChangeSuffix
 
@@ -94,13 +94,13 @@ func getAttestationTopic*(forkDigest: ForkDigest,
   ## For subscribing and unsubscribing to/from a subnet.
   eth2Prefix(forkDigest) & "beacon_attestation_" & $(subnetId) & "/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#topics-and-messages
 func getSyncCommitteeTopic*(forkDigest: ForkDigest,
                             subcommitteeIdx: SyncSubcommitteeIndex): string =
   ## For subscribing and unsubscribing to/from a subnet.
   eth2Prefix(forkDigest) & "sync_committee_" & $subcommitteeIdx & "/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#topics-and-messages
 func getSyncCommitteeContributionAndProofTopic*(forkDigest: ForkDigest): string =
   ## For subscribing and unsubscribing to/from a subnet.
   eth2Prefix(forkDigest) & "sync_committee_contribution_and_proof/ssz_snappy"
@@ -110,16 +110,16 @@ func getBlobSidecarTopic*(forkDigest: ForkDigest,
                           subnet_id: SubnetId): string =
   eth2Prefix(forkDigest) & "blob_sidecar_" & $subnet_id & "/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/validator.md#sidecar
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/validator.md#sidecar
 func compute_subnet_for_blob_sidecar*(blob_index: BlobIndex): SubnetId =
   SubnetId(blob_index mod BLOB_SIDECAR_SUBNET_COUNT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#light_client_finality_update
 func getLightClientFinalityUpdateTopic*(forkDigest: ForkDigest): string =
   ## For broadcasting or obtaining the latest `LightClientFinalityUpdate`.
   eth2Prefix(forkDigest) & "light_client_finality_update/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
 func getLightClientOptimisticUpdateTopic*(forkDigest: ForkDigest): string =
   ## For broadcasting or obtaining the latest `LightClientOptimisticUpdate`.
   eth2Prefix(forkDigest) & "light_client_optimistic_update/ssz_snappy"
@@ -156,7 +156,7 @@ func getDiscoveryForkID*(cfg: RuntimeConfig,
       next_fork_version: current_fork_version,
       next_fork_epoch: FAR_FUTURE_EPOCH)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/p2p-interface.md#transitioning-the-gossip
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#transitioning-the-gossip
 type GossipState* = set[ConsensusFork]
 func getTargetGossipState*(
     epoch, ALTAIR_FORK_EPOCH, BELLATRIX_FORK_EPOCH, CAPELLA_FORK_EPOCH,
@@ -198,7 +198,7 @@ func getTargetGossipState*(
   targetForks
 
 func nearSyncCommitteePeriod*(epoch: Epoch): Opt[uint64] =
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#sync-committee-subnet-stability
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#sync-committee-subnet-stability
   if epoch.is_sync_committee_period():
     return Opt.some 0'u64
   let epochsBefore =
@@ -217,7 +217,7 @@ func getSyncSubnets*(
     if not nodeHasPubkey(pubkey):
       continue
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#broadcast-sync-committee-message
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#broadcast-sync-committee-message
     # The first quarter of the pubkeys map to subnet 0, the second quarter to
     # subnet 1, the third quarter to subnet 2 and the final quarter to subnet
     # 3.
diff --git a/beacon_chain/spec/presets/gnosis/altair_preset.nim b/beacon_chain/spec/presets/gnosis/altair_preset.nim
index 331f5b6f5..c358de3cd 100644
--- a/beacon_chain/spec/presets/gnosis/altair_preset.nim
+++ b/beacon_chain/spec/presets/gnosis/altair_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Mainnet preset - Altair
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/altair.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/gnosis/bellatrix_preset.nim b/beacon_chain/spec/presets/gnosis/bellatrix_preset.nim
index a5d954bab..2685b1cf3 100644
--- a/beacon_chain/spec/presets/gnosis/bellatrix_preset.nim
+++ b/beacon_chain/spec/presets/gnosis/bellatrix_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Gnosis preset - Bellatrix
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/bellatrix.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/mainnet/altair_preset.nim b/beacon_chain/spec/presets/mainnet/altair_preset.nim
index 49809d92a..145f37ad4 100644
--- a/beacon_chain/spec/presets/mainnet/altair_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/altair_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Mainnet preset - Altair
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/altair.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim b/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim
index 8371fd7a8..a7a59ebff 100644
--- a/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Mainnet preset - Bellatrix
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/bellatrix.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/mainnet/capella_preset.nim b/beacon_chain/spec/presets/mainnet/capella_preset.nim
index f72ab768c..f230fdd9d 100644
--- a/beacon_chain/spec/presets/mainnet/capella_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/capella_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Mainnet preset - Capella
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/capella.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/capella.yaml
 const
   # Max operations per block
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/mainnet/deneb_preset.nim b/beacon_chain/spec/presets/mainnet/deneb_preset.nim
index a9c5177d7..26f84f008 100644
--- a/beacon_chain/spec/presets/mainnet/deneb_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/deneb_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Mainnet preset - Deneb
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/mainnet/deneb.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/mainnet/deneb.yaml
 const
   # `uint64(4096)`
   FIELD_ELEMENTS_PER_BLOB*: uint64 = 4096
diff --git a/beacon_chain/spec/presets/minimal/altair_preset.nim b/beacon_chain/spec/presets/minimal/altair_preset.nim
index a8dff6b14..f766f05a3 100644
--- a/beacon_chain/spec/presets/minimal/altair_preset.nim
+++ b/beacon_chain/spec/presets/minimal/altair_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Minimal preset - Altair
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/minimal/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/minimal/altair.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/minimal/bellatrix_preset.nim b/beacon_chain/spec/presets/minimal/bellatrix_preset.nim
index c0add4cc2..fffb8a53a 100644
--- a/beacon_chain/spec/presets/minimal/bellatrix_preset.nim
+++ b/beacon_chain/spec/presets/minimal/bellatrix_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Minimal preset - Bellatrix
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/minimal/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/minimal/bellatrix.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/minimal/capella_preset.nim b/beacon_chain/spec/presets/minimal/capella_preset.nim
index f8e4035ea..5c001aead 100644
--- a/beacon_chain/spec/presets/minimal/capella_preset.nim
+++ b/beacon_chain/spec/presets/minimal/capella_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Minimal preset - Capella
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/minimal/capella.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/minimal/capella.yaml
 const
   # Max operations per block
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/minimal/deneb_preset.nim b/beacon_chain/spec/presets/minimal/deneb_preset.nim
index 1f72da39f..0a44f68eb 100644
--- a/beacon_chain/spec/presets/minimal/deneb_preset.nim
+++ b/beacon_chain/spec/presets/minimal/deneb_preset.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # Minimal preset - Deneb
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/presets/minimal/deneb.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/presets/minimal/deneb.yaml
 const
   # [customized]
   FIELD_ELEMENTS_PER_BLOB*: uint64 = 4
diff --git a/beacon_chain/spec/signatures.nim b/beacon_chain/spec/signatures.nim
index bed1d0a87..650dc2fdc 100644
--- a/beacon_chain/spec/signatures.nim
+++ b/beacon_chain/spec/signatures.nim
@@ -44,7 +44,7 @@ func compute_slot_signing_root*(
       fork, DOMAIN_SELECTION_PROOF, epoch, genesis_validators_root)
   compute_signing_root(slot, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#aggregation-selection
 func get_slot_signature*(
     fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
     privkey: ValidatorPrivKey): CookedSig =
@@ -59,7 +59,7 @@ func compute_epoch_signing_root*(
   let domain = get_domain(fork, DOMAIN_RANDAO, epoch, genesis_validators_root)
   compute_signing_root(epoch, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#randao-reveal
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#randao-reveal
 func get_epoch_signature*(
     fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
     privkey: ValidatorPrivKey): CookedSig =
@@ -146,7 +146,7 @@ func compute_aggregate_and_proof_signing_root*(
       fork, DOMAIN_AGGREGATE_AND_PROOF, epoch, genesis_validators_root)
   compute_signing_root(aggregate_and_proof, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#broadcast-aggregate
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#broadcast-aggregate
 func get_aggregate_and_proof_signature*(fork: Fork, genesis_validators_root: Eth2Digest,
                                         aggregate_and_proof: AggregateAndProof,
                                         privkey: ValidatorPrivKey): CookedSig =
@@ -264,7 +264,7 @@ proc verify_voluntary_exit_signature*(
 
     blsVerify(pubkey, signing_root.data, signature)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#prepare-sync-committee-message
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#prepare-sync-committee-message
 func compute_sync_committee_message_signing_root*(
     fork: Fork, genesis_validators_root: Eth2Digest,
     slot: Slot, beacon_block_root: Eth2Digest): Eth2Digest =
@@ -299,7 +299,7 @@ proc verify_sync_committee_signature*(
 
   blsFastAggregateVerify(pubkeys, signing_root.data, signature)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#aggregation-selection
 func compute_sync_committee_selection_proof_signing_root*(
     fork: Fork, genesis_validators_root: Eth2Digest,
     slot: Slot, subcommittee_index: SyncSubcommitteeIndex): Eth2Digest =
@@ -330,7 +330,7 @@ proc verify_sync_committee_selection_proof*(
 
     blsVerify(pubkey, signing_root.data, signature)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#signature
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#signature
 func compute_contribution_and_proof_signing_root*(
     fork: Fork, genesis_validators_root: Eth2Digest,
     msg: ContributionAndProof): Eth2Digest =
@@ -348,7 +348,7 @@ proc get_contribution_and_proof_signature*(
 
   blsSign(privkey, signing_root.data)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#aggregation-selection
 func is_sync_committee_aggregator*(signature: ValidatorSig): bool =
   let
     signatureDigest = eth2digest(signature.blob)
@@ -388,7 +388,7 @@ proc verify_builder_signature*(
   let signing_root = compute_builder_signing_root(fork, msg)
   blsVerify(pubkey, signing_root.data, signature)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#new-process_bls_to_execution_change
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#new-process_bls_to_execution_change
 func compute_bls_to_execution_change_signing_root*(
     genesisFork: Fork, genesis_validators_root: Eth2Digest,
     msg: BLSToExecutionChange): Eth2Digest =
diff --git a/beacon_chain/spec/state_transition.nim b/beacon_chain/spec/state_transition.nim
index 5d0d74d5d..ffd49daef 100644
--- a/beacon_chain/spec/state_transition.nim
+++ b/beacon_chain/spec/state_transition.nim
@@ -364,7 +364,7 @@ template partialBeaconBlock*(
       deposits: List[Deposit, Limit MAX_DEPOSITS](deposits),
       voluntary_exits: validator_changes.voluntary_exits))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#preparing-a-beaconblock
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#preparing-a-beaconblock
 template partialBeaconBlock*(
     cfg: RuntimeConfig,
     state: var altair.HashedBeaconState,
@@ -423,7 +423,7 @@ template partialBeaconBlock*(
       sync_aggregate: sync_aggregate,
       execution_payload: execution_payload.executionPayload))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/validator.md#block-proposal
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/validator.md#block-proposal
 template partialBeaconBlock*(
     cfg: RuntimeConfig,
     state: var capella.HashedBeaconState,
@@ -540,7 +540,7 @@ proc makeBeaconBlock*(
           forkyState.data.latest_execution_payload_header.transactions_root =
             transactions_root.get
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#beaconblockbody
+          # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#beaconblockbody
           # Effectively hash_tree_root(ExecutionPayload) with the beacon block
           # body, with the execution payload replaced by the execution payload
           # header. htr(payload) == htr(payload header), so substitute.
diff --git a/beacon_chain/spec/state_transition_block.nim b/beacon_chain/spec/state_transition_block.nim
index 0b7a5531a..914f11dea 100644
--- a/beacon_chain/spec/state_transition_block.nim
+++ b/beacon_chain/spec/state_transition_block.nim
@@ -9,7 +9,7 @@
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/beacon-chain.md#block-processing
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#block-processing
 #
 # The entry point is `process_block` which is at the bottom of this file.
@@ -126,7 +126,7 @@ func process_eth1_data(
     state.eth1_data = body.eth1_data
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#is_slashable_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#is_slashable_validator
 func is_slashable_validator(validator: Validator, epoch: Epoch): bool =
   # Check if ``validator`` is slashable.
   (not validator.slashed) and
@@ -182,7 +182,7 @@ proc check_proposer_slashing*(
   withState(state):
     check_proposer_slashing(forkyState.data, proposer_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#proposer-slashings
 proc process_proposer_slashing*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
     proposer_slashing: SomeProposerSlashing, flags: UpdateFlags,
@@ -246,7 +246,7 @@ proc check_attester_slashing*(
   withState(state):
     check_attester_slashing(forkyState.data, attester_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#attester-slashings
 proc process_attester_slashing*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -330,7 +330,7 @@ proc process_deposit*(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#voluntary-exits
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/deneb/beacon-chain.md#modified-process_voluntary_exit
 proc check_voluntary_exit*(
     cfg: RuntimeConfig,
@@ -388,7 +388,7 @@ proc check_voluntary_exit*(
   withState(state):
     check_voluntary_exit(cfg, forkyState.data, signed_voluntary_exit, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#voluntary-exits
 proc process_voluntary_exit*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -419,7 +419,7 @@ proc process_bls_to_execution_change*(
   ok()
 
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#operations
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#modified-process_operations
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#modified-process_operations
 proc process_operations(cfg: RuntimeConfig,
                         state: var ForkyBeaconState,
                         body: SomeForkyBeaconBlockBody,
@@ -465,11 +465,11 @@ func get_participant_reward*(total_active_balance: Gwei): Gwei =
         WEIGHT_DENOMINATOR div SLOTS_PER_EPOCH
   max_participant_rewards div SYNC_COMMITTEE_SIZE
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#sync-aggregate-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#sync-aggregate-processing
 func get_proposer_reward*(participant_reward: Gwei): Gwei =
   participant_reward * PROPOSER_WEIGHT div (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#sync-aggregate-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#sync-aggregate-processing
 proc process_sync_aggregate*(
     state: var (altair.BeaconState | bellatrix.BeaconState |
                 capella.BeaconState | deneb.BeaconState),
@@ -845,7 +845,7 @@ proc process_block*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 type SomeBellatrixBlock =
   bellatrix.BeaconBlock | bellatrix.SigVerifiedBeaconBlock | bellatrix.TrustedBeaconBlock
diff --git a/beacon_chain/spec/state_transition_epoch.nim b/beacon_chain/spec/state_transition_epoch.nim
index 5c7a0a5a4..cd0d5140f 100644
--- a/beacon_chain/spec/state_transition_epoch.nim
+++ b/beacon_chain/spec/state_transition_epoch.nim
@@ -243,7 +243,7 @@ func is_unslashed_participating_index(
     has_flag(epoch_participation[].item(validator_index), flag_index) and
     not state.validators[validator_index].slashed
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#justification-and-finalization
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#justification-and-finalization
 type FinalityState = object
   slot: Slot
   current_epoch_ancestor_root: Eth2Digest
@@ -311,7 +311,7 @@ proc weigh_justification_and_finalization(
   ## state.justification_bits[1:] = state.justification_bits[:-1]
   ## state.justification_bits[0] = 0b0
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#misc
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#misc
   const JUSTIFICATION_BITS_LENGTH = 4
 
   state.justification_bits = JustificationBits(
@@ -388,7 +388,7 @@ proc weigh_justification_and_finalization(
       current_epoch = current_epoch,
       checkpoint = shortLog(state.finalized_checkpoint)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#justification-and-finalization
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#justification-and-finalization
 proc process_justification_and_finalization*(
     state: var phase0.BeaconState,
     balances: TotalBalances, flags: UpdateFlags = {}) =
@@ -424,7 +424,7 @@ proc compute_unrealized_finality*(
     justified: finalityState.current_justified_checkpoint,
     finalized: finalityState.finalized_checkpoint)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#justification-and-finalization
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#justification-and-finalization
 proc process_justification_and_finalization*(
     state: var (altair.BeaconState | bellatrix.BeaconState |
                 capella.BeaconState | deneb.BeaconState),
@@ -460,7 +460,7 @@ proc compute_unrealized_finality*(
     justified: finalityState.current_justified_checkpoint,
     finalized: finalityState.finalized_checkpoint)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#helpers
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#helpers
 func get_base_reward_sqrt*(state: phase0.BeaconState, index: ValidatorIndex,
     total_balance_sqrt: auto): Gwei =
   # Spec function recalculates total_balance every time, which creates an
@@ -508,7 +508,7 @@ func get_attestation_component_delta(is_unslashed_attester: bool,
   else:
     RewardDelta(penalties: base_reward)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#components-of-attestation-deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#components-of-attestation-deltas
 func get_source_delta*(validator: RewardStatus,
                        base_reward: uint64,
                        balances: TotalBalances,
@@ -631,7 +631,7 @@ func get_attestation_deltas(
         info.validators[proposer_index].delta.add(
           proposer_delta.get()[1])
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#get_base_reward
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#get_base_reward
 func get_base_reward_increment*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
            deneb.BeaconState,
@@ -656,7 +656,7 @@ func get_flag_index_reward*(
   else:
     0.Gwei
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#get_flag_index_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#get_flag_index_deltas
 func get_unslashed_participating_increment*(
     info: altair.EpochInfo | bellatrix.BeaconState, flag_index: TimelyFlag): Gwei =
   info.balances.previous_epoch[flag_index] div EFFECTIVE_BALANCE_INCREMENT
@@ -666,7 +666,7 @@ func get_active_increments*(
     info: altair.EpochInfo | bellatrix.BeaconState): Gwei =
   info.balances.current_epoch div EFFECTIVE_BALANCE_INCREMENT
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#get_flag_index_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#get_flag_index_deltas
 iterator get_flag_index_deltas*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
            deneb.BeaconState,
@@ -889,12 +889,12 @@ func get_adjusted_total_slashing_balance*(
 
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/altair/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#slashings
 func slashing_penalty_applies*(validator: Validator, epoch: Epoch): bool =
   validator.slashed and
   epoch + EPOCHS_PER_SLASHINGS_VECTOR div 2 == validator.withdrawable_epoch
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/altair/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/beacon-chain.md#slashings
 func get_slashing_penalty*(validator: Validator,
@@ -907,8 +907,8 @@ func get_slashing_penalty*(validator: Validator,
   penalty_numerator div total_balance * increment
 
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/bellatrix/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/beacon-chain.md#slashings
 func process_slashings*(state: var ForkyBeaconState, total_balance: Gwei) =
   let
     epoch = get_current_epoch(state)
@@ -952,7 +952,7 @@ func process_effective_balance_updates*(state: var ForkyBeaconState) =
       if new_effective_balance != effective_balance:
         state.validators.mitem(vidx).effective_balance = new_effective_balance
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#slashings-balances-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#slashings-balances-updates
 func process_slashings_reset*(state: var ForkyBeaconState) =
   let next_epoch = get_current_epoch(state) + 1
 
@@ -985,7 +985,7 @@ func process_historical_roots_update*(state: var ForkyBeaconState) =
   if next_epoch mod (SLOTS_PER_HISTORICAL_ROOT div SLOTS_PER_EPOCH) == 0:
     # Equivalent to hash_tree_root(foo: HistoricalBatch), but without using
     # significant additional stack or heap.
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#historicalbatch
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#historicalbatch
     # In response to https://github.com/status-im/nimbus-eth2/issues/921
     if not state.historical_roots.add state.compute_historical_root():
       raiseAssert "no more room for historical roots, so long and thanks for the fish!"
@@ -1057,7 +1057,7 @@ func process_inactivity_updates*(
     if pre_inactivity_score != inactivity_score:
       state.inactivity_scores[index] = inactivity_score
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#historical-summaries-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#historical-summaries-updates
 func process_historical_summaries_update*(
     state: var (capella.BeaconState | deneb.BeaconState)):
     Result[void, cstring] =
@@ -1073,7 +1073,7 @@ func process_historical_summaries_update*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#epoch-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#epoch-processing
 proc process_epoch*(
     cfg: RuntimeConfig, state: var phase0.BeaconState, flags: UpdateFlags,
     cache: var StateCache, info: var phase0.EpochInfo): Result[void, cstring] =
@@ -1177,7 +1177,7 @@ proc process_epoch*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/capella/beacon-chain.md#epoch-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/beacon-chain.md#epoch-processing
 proc process_epoch*(
     cfg: RuntimeConfig,
     state: var (capella.BeaconState | deneb.BeaconState),
@@ -1188,7 +1188,7 @@ proc process_epoch*(
 
   info.init(state)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#justification-and-finalization
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#justification-and-finalization
   process_justification_and_finalization(state, info.balances, flags)
 
   # state.slot hasn't been incremented yet.
@@ -1207,10 +1207,10 @@ proc process_epoch*(
   # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#rewards-and-penalties
   process_rewards_and_penalties(cfg, state, info)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#registry-updates
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#registry-updates
   ? process_registry_updates(cfg, state, cache)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/beacon-chain.md#slashings
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/beacon-chain.md#slashings
   process_slashings(state, info.balances.current_epoch)
 
   process_eth1_data_reset(state)
diff --git a/beacon_chain/spec/validator.nim b/beacon_chain/spec/validator.nim
index 329eec08f..d28e6327e 100644
--- a/beacon_chain/spec/validator.nim
+++ b/beacon_chain/spec/validator.nim
@@ -21,7 +21,7 @@ const
   PIVOT_VIEW_SIZE = SEED_SIZE + ROUND_SIZE
   TOTAL_SIZE = PIVOT_VIEW_SIZE + POSITION_WINDOW_SIZE
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#compute_shuffled_index
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#compute_shuffled_index
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#compute_committee
 # Port of https://github.com/protolambda/zrnt/blob/master/eth2/beacon/shuffle.go
 # Shuffles or unshuffles, depending on the `dir` (true for shuffling, false for unshuffling
@@ -301,7 +301,7 @@ func get_beacon_committee_len*(
   withState(state):
     get_beacon_committee_len(forkyState.data, slot, index, cache)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#compute_shuffled_index
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#compute_shuffled_index
 func compute_shuffled_index*(
     index: uint64, index_count: uint64, seed: Eth2Digest): uint64 =
   ## Return the shuffled index corresponding to ``seed`` (and ``index_count``).
@@ -336,7 +336,7 @@ func compute_shuffled_index*(
 
   cur_idx_permuted
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#compute_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#compute_proposer_index
 func compute_proposer_index(state: ForkyBeaconState,
     indices: seq[ValidatorIndex], seed: Eth2Digest): Opt[ValidatorIndex] =
   ## Return from ``indices`` a random index sampled by effective balance.
@@ -363,7 +363,7 @@ func compute_proposer_index(state: ForkyBeaconState,
       return Opt.some(candidate_index)
     i += 1
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_beacon_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_beacon_proposer_index
 func get_beacon_proposer_index*(
     state: ForkyBeaconState, cache: var StateCache, slot: Slot):
     Opt[ValidatorIndex] =
@@ -401,7 +401,7 @@ func get_beacon_proposer_index*(
 
     return res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#get_beacon_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_beacon_proposer_index
 func get_beacon_proposer_index*(state: ForkyBeaconState, cache: var StateCache):
     Opt[ValidatorIndex] =
   ## Return the beacon proposer index at the current slot.
@@ -413,7 +413,7 @@ func get_beacon_proposer_index*(state: ForkedHashedBeaconState,
   withState(state):
     get_beacon_proposer_index(forkyState.data, cache, slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#aggregation-selection
 func is_aggregator*(committee_len: uint64, slot_signature: ValidatorSig): bool =
   let modulo = max(1'u64, committee_len div TARGET_AGGREGATORS_PER_COMMITTEE)
   bytes_to_uint64(eth2digest(
diff --git a/beacon_chain/spec/weak_subjectivity.nim b/beacon_chain/spec/weak_subjectivity.nim
index ffd2cd19b..a100a2443 100644
--- a/beacon_chain/spec/weak_subjectivity.nim
+++ b/beacon_chain/spec/weak_subjectivity.nim
@@ -10,10 +10,10 @@
 import
   ./datatypes/base, ./beaconstate, ./forks, ./helpers
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/weak-subjectivity.md#configuration
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/weak-subjectivity.md#configuration
 const SAFETY_DECAY* = 10'u64
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/weak-subjectivity.md#compute_weak_subjectivity_period
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/weak-subjectivity.md#compute_weak_subjectivity_period
 func compute_weak_subjectivity_period(
     cfg: RuntimeConfig, state: ForkyBeaconState): uint64 =
   ## Returns the weak subjectivity period for the current ``state``.
@@ -49,7 +49,7 @@ func compute_weak_subjectivity_period(
 
   ws_period
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/weak-subjectivity.md#is_within_weak_subjectivity_period
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/weak-subjectivity.md#is_within_weak_subjectivity_period
 func is_within_weak_subjectivity_period*(cfg: RuntimeConfig, current_slot: Slot,
                                          ws_state: ForkedHashedBeaconState,
                                          ws_checkpoint: Checkpoint): bool =
diff --git a/beacon_chain/sync/light_client_manager.nim b/beacon_chain/sync/light_client_manager.nim
index 78f99d692..dfc2f067b 100644
--- a/beacon_chain/sync/light_client_manager.nim
+++ b/beacon_chain/sync/light_client_manager.nim
@@ -110,7 +110,7 @@ proc isGossipSupported*(
     finalizedPeriod = self.getFinalizedPeriod(),
     isNextSyncCommitteeKnown = self.isNextSyncCommitteeKnown())
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
 proc doRequest(
     e: typedesc[Bootstrap],
     peer: Peer,
@@ -119,7 +119,7 @@ proc doRequest(
     raises: [Defect, IOError].} =
   peer.lightClientBootstrap(blockRoot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
 type LightClientUpdatesByRangeResponse =
   NetRes[List[ForkedLightClientUpdate, MAX_REQUEST_LIGHT_CLIENT_UPDATES]]
 proc doRequest(
@@ -138,7 +138,7 @@ proc doRequest(
       raise newException(ResponseError, e.error)
   return response
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
 proc doRequest(
     e: typedesc[FinalityUpdate],
     peer: Peer
@@ -146,7 +146,7 @@ proc doRequest(
     raises: [Defect, IOError].} =
   peer.lightClientFinalityUpdate()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
 proc doRequest(
     e: typedesc[OptimisticUpdate],
     peer: Peer
@@ -335,7 +335,7 @@ template query[E](
 ): Future[bool] =
   self.query(e, Nothing())
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/light-client.md#light-client-sync-process
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/light-client.md#light-client-sync-process
 proc loop(self: LightClientManager) {.async.} =
   var nextSyncTaskTime = self.getBeaconTime()
   while true:
diff --git a/beacon_chain/sync/sync_protocol.nim b/beacon_chain/sync/sync_protocol.nim
index abb9984f7..30144544c 100644
--- a/beacon_chain/sync/sync_protocol.nim
+++ b/beacon_chain/sync/sync_protocol.nim
@@ -548,7 +548,7 @@ p2pProtocol BeaconSync(version = 1,
     debug "BlobSidecar range request done",
       peer, startSlot, count = reqCount, found
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
   proc lightClientBootstrap(
       peer: Peer,
       blockRoot: Eth2Digest,
@@ -576,7 +576,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC bootstrap request done", peer, blockRoot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
   proc lightClientUpdatesByRange(
       peer: Peer,
       startPeriod: SyncCommitteePeriod,
@@ -621,7 +621,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC updates by range request done", peer, startPeriod, count, found
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
   proc lightClientFinalityUpdate(
       peer: Peer,
       response: SingleChunkResponse[ForkedLightClientFinalityUpdate])
@@ -648,7 +648,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC finality update request done", peer
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
   proc lightClientOptimisticUpdate(
       peer: Peer,
       response: SingleChunkResponse[ForkedLightClientOptimisticUpdate])
diff --git a/beacon_chain/trusted_node_sync.nim b/beacon_chain/trusted_node_sync.nim
index 42c441d33..b3d377c88 100644
--- a/beacon_chain/trusted_node_sync.nim
+++ b/beacon_chain/trusted_node_sync.nim
@@ -181,7 +181,7 @@ proc doTrustedNodeSync*(
     let stateId =
       case syncTarget.kind
       of TrustedNodeSyncKind.TrustedBlockRoot:
-        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/light-client.md#light-client-sync-process
+        # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/light-client.md#light-client-sync-process
         const lcDataFork = LightClientDataFork.high
         var bestViableCheckpoint: Opt[tuple[slot: Slot, state_root: Eth2Digest]]
         func trackBestViableCheckpoint(store: lcDataFork.LightClientStore) =
diff --git a/beacon_chain/validator_client/duties_service.nim b/beacon_chain/validator_client/duties_service.nim
index 38a5d78eb..75e30ca8a 100644
--- a/beacon_chain/validator_client/duties_service.nim
+++ b/beacon_chain/validator_client/duties_service.nim
@@ -405,7 +405,7 @@ proc pollForSyncCommitteeDuties*(service: DutiesServiceRef) {.async.} =
   let vc = service.client
   let
     currentSlot = vc.getCurrentSlot().get(Slot(0))
-    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#sync-committee
+    # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#sync-committee
     dutySlot = currentSlot + 1
     dutyEpoch = dutySlot.epoch()
 
diff --git a/beacon_chain/validators/validator_duties.nim b/beacon_chain/validators/validator_duties.nim
index 3698a0065..ef9452f36 100644
--- a/beacon_chain/validators/validator_duties.nim
+++ b/beacon_chain/validators/validator_duties.nim
@@ -1717,7 +1717,7 @@ proc handleValidatorDuties*(node: BeaconNode, lastSlot, slot: Slot) {.async.} =
   updateValidatorMetrics(node) # the important stuff is done, update the vanity numbers
 
   # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/validator.md#broadcast-aggregate
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#broadcast-sync-committee-contribution
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#broadcast-sync-committee-contribution
   # Wait 2 / 3 of the slot time to allow messages to propagate, then collect
   # the result in aggregates
   static:
diff --git a/beacon_chain/validators/validator_pool.nim b/beacon_chain/validators/validator_pool.nim
index 3dea1d9fd..a11bb096a 100644
--- a/beacon_chain/validators/validator_pool.nim
+++ b/beacon_chain/validators/validator_pool.nim
@@ -429,7 +429,7 @@ proc signData(v: AttachedValidator,
   else:
     v.signWithDistributedKey(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#signature
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#signature
 proc getBlockSignature*(v: AttachedValidator, fork: Fork,
                         genesis_validators_root: Eth2Digest, slot: Slot,
                         block_root: Eth2Digest,
@@ -618,7 +618,7 @@ proc getAggregateAndProofSignature*(v: AttachedValidator,
         fork, genesis_validators_root, aggregate_and_proof)
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#prepare-sync-committee-message
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#prepare-sync-committee-message
 proc getSyncCommitteeMessage*(v: AttachedValidator,
                               fork: Fork,
                               genesis_validators_root: Eth2Digest,
@@ -649,7 +649,7 @@ proc getSyncCommitteeMessage*(v: AttachedValidator,
       )
     )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#aggregation-selection
 proc getSyncCommitteeSelectionProof*(v: AttachedValidator, fork: Fork,
                                      genesis_validators_root: Eth2Digest,
                                      slot: Slot,
@@ -669,7 +669,7 @@ proc getSyncCommitteeSelectionProof*(v: AttachedValidator, fork: Fork,
       )
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/validator.md#broadcast-sync-committee-contribution
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#broadcast-sync-committee-contribution
 proc getContributionAndProofSignature*(v: AttachedValidator, fork: Fork,
                                        genesis_validators_root: Eth2Digest,
                                        contribution_and_proof: ContributionAndProof
@@ -700,7 +700,7 @@ proc getEpochSignature*(v: AttachedValidator, fork: Fork,
         fork, genesis_validators_root, epoch)
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#aggregation-selection
 proc getSlotSignature*(v: AttachedValidator, fork: Fork,
                        genesis_validators_root: Eth2Digest, slot: Slot
                       ): Future[SignatureResult] {.async.} =
diff --git a/docs/attestation_flow.md b/docs/attestation_flow.md
index 1be3a3aa9..136c9a8ef 100644
--- a/docs/attestation_flow.md
+++ b/docs/attestation_flow.md
@@ -7,7 +7,7 @@ This is a WIP document to explain the attestation flows.
 It is important to distinguish attestation `validation` from attestation `verification`.
 - Attestation `validation` is defined in the P2P specs. Validated attestations can be forwarded on GossipSub.
   - Aggregated: https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
-  - Unaggregated: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
+  - Unaggregated: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
 - Attestation `verification` is defined in the consensus specs. Verified attestations can affect fork choice and may be included in a block.
   - https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#attestations
 
@@ -51,7 +51,7 @@ These GossipSub topics are used to listen for attestations:
 - Unaggregated: `/eth2/{$forkDigest}/beacon_attestation_{subnetIndex}/ssz_snappy`
 
 The attestations are then validated by `validateAttestation()` or `validateAggregate()` in either `attestationValidator()` or `aggregateValidator()` according to the P2P specs.
-- https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
+- https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
 - https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/p2p-interface.md#attestation-subnets
 
 Finally, valid attestations are added to the local `attestationPool`.
diff --git a/docs/block_flow.md b/docs/block_flow.md
index c2c5b9d7a..4e29e85a9 100644
--- a/docs/block_flow.md
+++ b/docs/block_flow.md
@@ -6,10 +6,10 @@ This is a WIP document to explain the beacon block flows.
 
 Important distinction:
 - We distinguish block `validation` which is defined in the P2P specs:
-  https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/p2p-interface.md#beacon_block.
+  https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_block.
   A validated block can be forwarded on gossipsub.
 - and we distinguish `verification` which is defined in consensus specs:
-  https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/beacon-chain.md#block-processing
+  https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#block-processing
   A block needs to be verified to enter fork choice, the DAG and the BeaconChainDB
 
 In particular in terms of costly checks validating a block only requires checking:
diff --git a/docs/the_nimbus_book/src/el-light-client.md b/docs/the_nimbus_book/src/el-light-client.md
index 41cfb718e..fa7c028f2 100644
--- a/docs/the_nimbus_book/src/el-light-client.md
+++ b/docs/the_nimbus_book/src/el-light-client.md
@@ -104,7 +104,7 @@ The following sections explain how to do this for certain EL clients.
 ## Running the light client
 
 The light client starts syncing from a trusted block.
-This trusted block should be somewhat recent ([~1-2 weeks](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/weak-subjectivity.md)) and needs to be configured each time when starting the light client.
+This trusted block should be somewhat recent ([~1-2 weeks](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/weak-subjectivity.md)) and needs to be configured each time when starting the light client.
 
 ### 1. Obtaining a trusted block root
 
@@ -188,7 +188,7 @@ NOT 2022-11-21 18:04:03.982+01:00 New LC optimistic block                    opt
 ```
 
 !!! note
-    The [light client protocol](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md) depends on consensus layer (CL) full nodes to serve additional data.
+    The [light client protocol](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md) depends on consensus layer (CL) full nodes to serve additional data.
     As this is a new protocol, not all implementations are supporting it yet.
     Therefore, it may take several minutes to discover supporting peers, during which no log messages may be produced.
 
diff --git a/docs/the_nimbus_book/src/light-client-data.md b/docs/the_nimbus_book/src/light-client-data.md
index eecf708ff..2ca4e9d9d 100644
--- a/docs/the_nimbus_book/src/light-client-data.md
+++ b/docs/the_nimbus_book/src/light-client-data.md
@@ -2,7 +2,7 @@
 
 Nimbus is configured by default to serve data that allows light clients to stay in sync with the Ethereum network.
 Light client data is imported incrementally and does not affect validator performance.
-Information about the light client sync protocol can be found in the [Ethereum consensus specs](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md).
+Information about the light client sync protocol can be found in the [Ethereum consensus specs](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md).
 
 !!! note
     Nimbus also implements a [standalone light client](./el-light-client.md) that may be used to sync an execution layer (EL) client.
diff --git a/docs/the_nimbus_book/src/web3signer.md b/docs/the_nimbus_book/src/web3signer.md
index 08f1bc4a0..988aa385e 100644
--- a/docs/the_nimbus_book/src/web3signer.md
+++ b/docs/the_nimbus_book/src/web3signer.md
@@ -125,7 +125,7 @@ If you are already using a threshold signing setup (e.g. based on Vouch and Dirk
 
 The verifying Web3Signer is an experimental extension to the [Web3Signer protocol](https://consensys.github.io/web3signer/web3signer-eth2.html#tag/Signing/operation/ETH2_SIGN) which allows the remote signer to verify certain details of the signed blocks before creating a signature (for example, the signer may require the signed block to have a particular fee recipient value).
 
-To enable this use case, the `BLOCK_V2` request type of the `/api/v1/eth2/sign/{identifier}` endpoint is extended with an additional array field named `proofs`. The array consists of objects with the properties `index`, `proof` and `value`, where `index` is an arbitrary [generalized index](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/ssz/merkle-proofs.md#generalized-merkle-tree-index) of any property nested under the block body and `proof` is its corresponding Merkle proof against the block body root included in the request. The `value` property is optional and it is included only when the SSZ hash of the field included in the Merkle proof doesn't match its value.
+To enable this use case, the `BLOCK_V2` request type of the `/api/v1/eth2/sign/{identifier}` endpoint is extended with an additional array field named `proofs`. The array consists of objects with the properties `index`, `proof` and `value`, where `index` is an arbitrary [generalized index](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/ssz/merkle-proofs.md#generalized-merkle-tree-index) of any property nested under the block body and `proof` is its corresponding Merkle proof against the block body root included in the request. The `value` property is optional and it is included only when the SSZ hash of the field included in the Merkle proof doesn't match its value.
 
 Since the generalized index of a particular field may change in a hard-fork, in the remote keystore format the proven fields are usually specified by their name:
 
diff --git a/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim b/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim
index e90c830e7..52e7c6d9e 100644
--- a/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim
+++ b/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim
@@ -22,7 +22,7 @@ import
   # Test utilities
   ../../testutil, ../../testblockutil
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/tests/core/pyspec/eth2spec/test/helpers/sync_committee.py#L27-L44
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/tests/core/pyspec/eth2spec/test/helpers/sync_committee.py#L27-L44
 proc compute_aggregate_sync_committee_signature(
     cfg: RuntimeConfig,
     forked: ForkedHashedBeaconState,
@@ -53,7 +53,7 @@ proc compute_aggregate_sync_committee_signature(
       aggregateSig.aggregate(signature)
   aggregateSig.finish.toValidatorSig
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L11-L41
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L11-L41
 proc get_sync_aggregate(
     cfg: RuntimeConfig,
     forked: ForkedHashedBeaconState,
@@ -137,7 +137,7 @@ let full_sync_committee_bits = block:
   res.bytes.fill(byte.high)
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
 func initialize_light_client_store(
     state: auto, storeDataFork: static LightClientDataFork): auto =
   storeDataFork.LightClientStore(
diff --git a/tests/consensus_spec/fixtures_utils.nim b/tests/consensus_spec/fixtures_utils.nim
index 9d009e02e..e62c780f3 100644
--- a/tests/consensus_spec/fixtures_utils.nim
+++ b/tests/consensus_spec/fixtures_utils.nim
@@ -75,7 +75,7 @@ type
     rewards*: List[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
     penalties*: List[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#eth1block
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#eth1block
   Eth1Block* = object
     timestamp*: uint64
     deposit_root*: Eth2Digest
diff --git a/tests/testblockutil.nim b/tests/testblockutil.nim
index 030c05d01..57a1c93af 100644
--- a/tests/testblockutil.nim
+++ b/tests/testblockutil.nim
@@ -25,7 +25,7 @@ const
   MockPrivKeys* = MockPrivKeysT()
   MockPubKeys* = MockPubKeysT()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/tests/core/pyspec/eth2spec/test/helpers/keys.py
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/tests/core/pyspec/eth2spec/test/helpers/keys.py
 func `[]`*(_: MockPrivKeysT, index: ValidatorIndex|uint64): ValidatorPrivKey =
   var bytes = (index.uint64 + 1'u64).toBytesLE()  # Consistent with EF tests
   static: doAssert sizeof(bytes) <= sizeof(result)
@@ -266,7 +266,7 @@ func makeAttestationData*(
     "Computed epoch was " & $slot.epoch &
     "  while the state current_epoch was " & $current_epoch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.0/specs/phase0/validator.md#attestation-data
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#attestation-data
   AttestationData(
     slot: slot,
     index: committee_index.uint64,