diff --git a/beacon_chain/beacon_chain_db_immutable.nim b/beacon_chain/beacon_chain_db_immutable.nim
index 7596c8bf8..1df23968e 100644
--- a/beacon_chain/beacon_chain_db_immutable.nim
+++ b/beacon_chain/beacon_chain_db_immutable.nim
@@ -72,7 +72,7 @@ type
     current_justified_checkpoint*: Checkpoint
     finalized_checkpoint*: Checkpoint
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#beaconstate
   # Memory-representation-equivalent to an Altair BeaconState for in-place SSZ
   # reading and writing
   AltairBeaconStateNoImmutableValidators* = object
diff --git a/beacon_chain/spec/datatypes/altair.nim b/beacon_chain/spec/datatypes/altair.nim
index c9e099774..7cbcbd3d7 100644
--- a/beacon_chain/spec/datatypes/altair.nim
+++ b/beacon_chain/spec/datatypes/altair.nim
@@ -49,7 +49,7 @@ const
   PARTICIPATION_FLAG_WEIGHTS* =
     [TIMELY_SOURCE_WEIGHT, TIMELY_TARGET_WEIGHT, TIMELY_HEAD_WEIGHT]
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/validator.md#misc
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/validator.md#misc
   TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE* = 4
   SYNC_COMMITTEE_SUBNET_COUNT* = 4
 
@@ -74,7 +74,7 @@ static: doAssert TIMELY_SOURCE_WEIGHT + TIMELY_TARGET_WEIGHT +
 type
   ### New types
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#custom-types
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#custom-types
   # TODO could be distinct
   ParticipationFlags* = uint8
 
@@ -83,7 +83,7 @@ type
     sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
     sync_committee_signature*: ValidatorSig
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#synccommittee
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#synccommittee
   SyncCommittee* = object
     pubkeys*: HashArray[Limit SYNC_COMMITTEE_SIZE, ValidatorPubKey]
     aggregate_pubkey*: ValidatorPubKey
@@ -128,19 +128,19 @@ type
     contribution*: SyncCommitteeContribution
     selection_proof*: ValidatorSig
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/validator.md#signedcontributionandproof
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/validator.md#signedcontributionandproof
   SignedContributionAndProof* = object
     message*: ContributionAndProof
     signature*: ValidatorSig
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/validator.md#syncaggregatorselectiondata
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/validator.md#syncaggregatorselectiondata
   SyncAggregatorSelectionData* = object
     slot*: Slot
     subcommittee_index*: uint64
 
   ### Modified/overloaded
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/sync-protocol.md#lightclientsnapshot
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/sync-protocol.md#lightclientsnapshot
   LightClientSnapshot* = object
     header*: BeaconBlockHeader ##\
     ## Beacon block header
@@ -150,7 +150,7 @@ type
 
     next_sync_committee*: SyncCommittee
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/sync-protocol.md#lightclientupdate
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/sync-protocol.md#lightclientupdate
   LightClientUpdate* = object
     header*: BeaconBlockHeader  ##\
     ## Update beacon block header
@@ -308,7 +308,7 @@ type
     state_root*: Eth2Digest ##\
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data ##\
@@ -369,7 +369,7 @@ type
     # [New in Altair]
     sync_aggregate*: SyncAggregate
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/phase0/beacon-chain.md#signedbeaconblock
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/phase0/beacon-chain.md#signedbeaconblock
   SignedBeaconBlock* = object
     message*: BeaconBlock
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/helpers.nim b/beacon_chain/spec/helpers.nim
index 9e6233f36..b9c0c10bb 100644
--- a/beacon_chain/spec/helpers.nim
+++ b/beacon_chain/spec/helpers.nim
@@ -185,7 +185,7 @@ func add_flag*(flags: ParticipationFlags, flag_index: int): ParticipationFlags =
   let flag = ParticipationFlags(1'u8 shl flag_index)
   flags or flag
 
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#has_flag
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#has_flag
 func has_flag*(flags: ParticipationFlags, flag_index: int): bool =
   let flag = ParticipationFlags(1'u8 shl flag_index)
   (flags and flag) == flag
diff --git a/beacon_chain/spec/presets/altair/mainnet.nim b/beacon_chain/spec/presets/altair/mainnet.nim
index 6d9887ca0..d04cc840d 100644
--- a/beacon_chain/spec/presets/altair/mainnet.nim
+++ b/beacon_chain/spec/presets/altair/mainnet.nim
@@ -11,7 +11,7 @@
 const
   # Updated penalty values
   # ---------------------------------------------------------------
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/presets/mainnet/altair.yaml#L3
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/presets/mainnet/altair.yaml#L3
   CONFIG_NAME* = "mainnet"
 
   INACTIVITY_PENALTY_QUOTIENT_ALTAIR* = 50331648 ##\
@@ -30,5 +30,5 @@ const
 
   # Sync protocol
   # ---------------------------------------------------------------
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/presets/mainnet/altair.yaml#L21
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/presets/mainnet/altair.yaml#L21
   MIN_SYNC_COMMITTEE_PARTICIPANTS* = 1
diff --git a/beacon_chain/spec/presets/altair/minimal.nim b/beacon_chain/spec/presets/altair/minimal.nim
index 0668fcce8..00c67dcc5 100644
--- a/beacon_chain/spec/presets/altair/minimal.nim
+++ b/beacon_chain/spec/presets/altair/minimal.nim
@@ -28,5 +28,5 @@ const
 
   # Sync protocol
   # ---------------------------------------------------------------
-  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/presets/minimal/altair.yaml#L21
+  # https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/presets/minimal/altair.yaml#L21
   MIN_SYNC_COMMITTEE_PARTICIPANTS* = 1
diff --git a/beacon_chain/spec/state_transition_block.nim b/beacon_chain/spec/state_transition_block.nim
index 734a790a7..11fa0ed92 100644
--- a/beacon_chain/spec/state_transition_block.nim
+++ b/beacon_chain/spec/state_transition_block.nim
@@ -422,7 +422,7 @@ proc process_block*(
   # The transition-triggering block creates, not acts on, an Altair state
   err("process_block: Altair state with Phase 0 block")
 
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#block-processing
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 # copy of datatypes/altair.nim
 type SomeAltairBlock =
diff --git a/beacon_chain/spec/state_transition_epoch.nim b/beacon_chain/spec/state_transition_epoch.nim
index 82c997338..064eedbab 100644
--- a/beacon_chain/spec/state_transition_epoch.nim
+++ b/beacon_chain/spec/state_transition_epoch.nim
@@ -412,7 +412,7 @@ func is_in_inactivity_leak(finality_delay: uint64): bool =
 func get_finality_delay(state: SomeBeaconState): uint64 =
   get_previous_epoch(state) - state.finalized_checkpoint.epoch
 
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/phase0/beacon-chain.md#rewards-and-penalties-1
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/phase0/beacon-chain.md#rewards-and-penalties-1
 func is_in_inactivity_leak(state: altair.BeaconState): bool =
   # TODO remove this, see above
   get_finality_delay(state) > MIN_EPOCHS_TO_INACTIVITY_PENALTY
@@ -566,7 +566,7 @@ func get_base_reward_per_increment(
   EFFECTIVE_BALANCE_INCREMENT * BASE_REWARD_FACTOR div
     integer_squareroot(total_active_balance)
 
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#get_base_reward
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#get_base_reward
 func get_base_reward(
     state: altair.BeaconState, index: ValidatorIndex, total_active_balance: Gwei):
     Gwei =
@@ -661,7 +661,7 @@ func process_rewards_and_penalties(
     increase_balance(state.balances.asSeq()[idx], v.delta.rewards)
     decrease_balance(state.balances.asSeq()[idx], v.delta.penalties)
 
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#rewards-and-penalties
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#rewards-and-penalties
 func process_rewards_and_penalties(
     state: var altair.BeaconState, total_active_balance: Gwei) {.nbench.} =
   if get_current_epoch(state) == GENESIS_EPOCH:
@@ -691,7 +691,7 @@ func process_rewards_and_penalties(
     decrease_balance(state, ValidatorIndex(index), penalties[index])
 
 # https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/beacon-chain.md#slashings
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#slashings
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#slashings
 func process_slashings*(state: var SomeBeaconState, total_balance: Gwei) {.nbench.}=
   let
     epoch = get_current_epoch(state)
@@ -805,7 +805,7 @@ proc process_sync_committee_updates*(state: var altair.BeaconState) =
     state.current_sync_committee = state.next_sync_committee
     state.next_sync_committee = get_next_sync_committee(state)
 
-# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.7/specs/altair/beacon-chain.md#inactivity-scores
+# https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.8/specs/altair/beacon-chain.md#inactivity-scores
 func process_inactivity_updates*(state: var altair.BeaconState) =
   # Score updates based on previous epoch participation, skip genesis epoch
   if get_current_epoch(state) == GENESIS_EPOCH: