diff --git a/beacon_chain/spec/datatypes.nim b/beacon_chain/spec/datatypes.nim
index 12a601007..9ba3538d0 100644
--- a/beacon_chain/spec/datatypes.nim
+++ b/beacon_chain/spec/datatypes.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
diff --git a/beacon_chain/spec/presets/mainnet.nim b/beacon_chain/spec/presets/mainnet.nim
index d18d1f335..a24c9a6c4 100644
--- a/beacon_chain/spec/presets/mainnet.nim
+++ b/beacon_chain/spec/presets/mainnet.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -136,7 +136,7 @@ const
 
   # Reward and penalty quotients
   # ---------------------------------------------------------------
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L110
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/configs/mainnet.yaml#L114
   BASE_REWARD_FACTOR* = 2'u64^6
   WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
   PROPOSER_REWARD_QUOTIENT* = 2'u64^3
diff --git a/beacon_chain/spec/presets/minimal.nim b/beacon_chain/spec/presets/minimal.nim
index 2d221f5df..7b42b5836 100644
--- a/beacon_chain/spec/presets/minimal.nim
+++ b/beacon_chain/spec/presets/minimal.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -118,7 +118,7 @@ const
 
   # Max operations per block
   # ---------------------------------------------------------------
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/minimal.yaml#L127
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/configs/minimal.yaml#L131
 
   MAX_PROPOSER_SLASHINGS* = 2^4
   MAX_ATTESTER_SLASHINGS* = 2^0
@@ -135,7 +135,7 @@ const
 
   # Validators
   # ---------------------------------------------------------------
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/validator/0_beacon-chain-validator.md#misc
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/configs/minimal.yaml#L32
 
   # Changed
   ETH1_FOLLOW_DISTANCE* = 16 # blocks
diff --git a/beacon_chain/spec/state_transition_epoch.nim b/beacon_chain/spec/state_transition_epoch.nim
index 2c59355f5..4df420f5e 100644
--- a/beacon_chain/spec/state_transition_epoch.nim
+++ b/beacon_chain/spec/state_transition_epoch.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -71,7 +71,7 @@ func get_total_active_balance*(state: BeaconState): Gwei =
     state,
     get_active_validator_indices(state, get_current_epoch(state)))
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#helper-functions-1
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#helper-functions-1
 func get_matching_source_attestations(state: BeaconState, epoch: Epoch):
     seq[PendingAttestation] =
   doAssert epoch in [get_current_epoch(state), get_previous_epoch(state)]
@@ -233,7 +233,7 @@ proc process_justification_and_finalization*(
       checkpoint = shortLog(state.finalized_checkpoint),
       cat = "finalization"
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#rewards-and-penalties-1
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#rewards-and-penalties-1
 func get_base_reward(state: BeaconState, index: ValidatorIndex,
     total_balance: auto): Gwei =
   # Spec function recalculates total_balance every time, which creates an
diff --git a/beacon_chain/spec/state_transition_helpers.nim b/beacon_chain/spec/state_transition_helpers.nim
index f8a339ed4..f6eb6c668 100644
--- a/beacon_chain/spec/state_transition_helpers.nim
+++ b/beacon_chain/spec/state_transition_helpers.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -22,7 +22,7 @@ func shortLog*(x: Checkpoint): string =
 # Helpers used in epoch transition and trace-level block transition
 # --------------------------------------------------------
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#helper-functions-1
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#helper-functions-1
 func get_attesting_indices*(
     state: BeaconState, attestations: openarray[PendingAttestation],
     stateCache: var StateCache): HashSet[ValidatorIndex] =
@@ -32,7 +32,7 @@ func get_attesting_indices*(
     result = result.union(get_attesting_indices(
       state, a.data, a.aggregation_bits, stateCache))
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.4/specs/core/0_beacon-chain.md#helper-functions-1
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#helper-functions-1
 func get_unslashed_attesting_indices*(
     state: BeaconState, attestations: openarray[PendingAttestation],
     stateCache: var StateCache): HashSet[ValidatorIndex] =
diff --git a/beacon_chain/spec/validator.nim b/beacon_chain/spec/validator.nim
index eb52b97bb..beaf709f8 100644
--- a/beacon_chain/spec/validator.nim
+++ b/beacon_chain/spec/validator.nim
@@ -1,4 +1,4 @@
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -146,7 +146,7 @@ func get_empty_per_epoch_cache*(): StateCache =
     initTable[Epoch, seq[ValidatorIndex]]()
   result.committee_count_cache = initTable[Epoch, uint64]()
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#compute_proposer_index
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#compute_proposer_index
 func compute_proposer_index(state: BeaconState, indices: seq[ValidatorIndex],
     seed: Eth2Digest, stateCache: var StateCache): Option[ValidatorIndex] =
   # Return from ``indices`` a random index sampled by effective balance.
diff --git a/beacon_chain/state_transition.nim b/beacon_chain/state_transition.nim
index fa1c97226..5b5e6db26 100644
--- a/beacon_chain/state_transition.nim
+++ b/beacon_chain/state_transition.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -44,7 +44,7 @@ declareGauge beacon_previous_validators, """Number of status="pending|active|exi
 # Canonical state transition functions
 # ---------------------------------------------------------------
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 func process_slot*(state: var BeaconState) {.nbench.}=
   # Cache state root
   let previous_state_root = hash_tree_root(state)
@@ -81,7 +81,7 @@ func get_epoch_validator_count(state: BeaconState): int64 =
        validator.withdrawable_epoch > get_current_epoch(state):
       result += 1
 
-# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 proc process_slots*(state: var BeaconState, slot: Slot) {.nbench.}=
   doAssert state.slot <= slot
 
diff --git a/tests/official/fixtures b/tests/official/fixtures
index 0328f9d52..1359bab0a 160000
--- a/tests/official/fixtures
+++ b/tests/official/fixtures
@@ -1 +1 @@
-Subproject commit 0328f9d525c74e14f36a5a63408b699483376f82
+Subproject commit 1359bab0ae93cec24183e7ae8dd12be3b8275198
diff --git a/tests/official/test_fixture_const_sanity_check.nim b/tests/official/test_fixture_const_sanity_check.nim
index be837c9c1..c9d4b768b 100644
--- a/tests/official/test_fixture_const_sanity_check.nim
+++ b/tests/official/test_fixture_const_sanity_check.nim
@@ -122,5 +122,5 @@ proc checkConfig() =
       else:
         check: ConstsToCheck[constant] == value.getBiggestInt().uint64()
 
-suite "Official - 0.10.0 - constants & config " & preset():
+suite "Official - 0.10.1 - constants & config " & preset():
   checkConfig()
diff --git a/tests/official/test_fixture_ssz_consensus_objects.nim b/tests/official/test_fixture_ssz_consensus_objects.nim
index 8d5fba047..9ae458910 100644
--- a/tests/official/test_fixture_ssz_consensus_objects.nim
+++ b/tests/official/test_fixture_ssz_consensus_objects.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -104,5 +104,5 @@ proc runSSZtests() =
           else:
             raise newException(ValueError, "Unsupported test: " & sszType)
 
-suite "Official - 0.10.0 - SSZ consensus objects " & preset():
+suite "Official - 0.10.1 - SSZ consensus objects " & preset():
   runSSZtests()
diff --git a/tests/official/test_fixture_ssz_generic_types.nim b/tests/official/test_fixture_ssz_generic_types.nim
index fd9ef541e..a6050cd39 100644
--- a/tests/official/test_fixture_ssz_generic_types.nim
+++ b/tests/official/test_fixture_ssz_generic_types.nim
@@ -1,5 +1,5 @@
 # beacon_chain
-# Copyright (c) 2018 Status Research & Development GmbH
+# Copyright (c) 2018-2020 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).