diff --git a/beacon_chain/consensus_object_pools/README.md b/beacon_chain/consensus_object_pools/README.md
index ecc16080a..b054883c0 100644
--- a/beacon_chain/consensus_object_pools/README.md
+++ b/beacon_chain/consensus_object_pools/README.md
@@ -15,7 +15,7 @@ After "gossip validation" the consensus objects can be rebroadcasted as they are
 For blocks, this means verifying state transition and all contained cryptographic signatures (instead of just the proposer signature).
 For other consensus objects, it is possible that gossip validation is a superset of consensus verification (TODO).
 
-The pools presenet in this folder are:
+The pools present in this folder are:
 - block_pools:
   - block_quarantine: for seemingly valid blocks that are on a fork unknown to us.
   - block_clearance: to verify (state_transition + cryptography) candidate blocks.
diff --git a/beacon_chain/consensus_object_pools/attestation_pool.nim b/beacon_chain/consensus_object_pools/attestation_pool.nim
index 30a41142d..9c61e8e15 100644
--- a/beacon_chain/consensus_object_pools/attestation_pool.nim
+++ b/beacon_chain/consensus_object_pools/attestation_pool.nim
@@ -37,7 +37,7 @@ type
     proc(data: SingleAttestation) {.gcsafe, raises: [].}
 
   Validation[CVBType] = object
-    ## Validations collect a set of signatures for a distict attestation - in
+    ## Validations collect a set of signatures for a distinct attestation - in
     ## eth2, a single bit is used to keep track of which signatures have been
     ## added to the aggregate meaning that only non-overlapping aggregates may
     ## be further combined.
@@ -740,7 +740,7 @@ func score(
     doAssert aggregation_bits.len() == xxx[].len(),
       "check_attestation ensures committee length"
 
-    # How many votes were in the attestation minues the votes that are the same
+    # How many votes were in the attestation minus the votes that are the same
     return bitsScore - aggregation_bits.countOverlap(xxx[])
 
   # Not found in cache - fresh vote meaning all attestations count
@@ -1002,7 +1002,7 @@ proc getElectraAttestationsForBlock*(
 
       #TODO: Merge candidates per block structure with the candidates one
       # and score possible on-chain attestations while collecting candidates
-      # (previous loop) and reavaluate cache key definition
+      # (previous loop) and reevaluate cache key definition
       let
         entry2 = block:
           var e2 = entry.data
@@ -1241,7 +1241,7 @@ proc selectOptimisticHead*(
 proc prune*(pool: var AttestationPool) =
   if (let v = pool.forkChoice.prune(); v.isErr):
     # If pruning fails, it's likely the result of a bug - this shouldn't happen
-    # but we'll keep running hoping that the fork chocie will recover eventually
+    # but we'll keep running hoping that the fork choice will recover eventually
     error "Couldn't prune fork choice, bug?", err = v.error()
 
 func validatorSeenAtEpoch*(pool: AttestationPool, epoch: Epoch,
diff --git a/beacon_chain/consensus_object_pools/block_clearance.nim b/beacon_chain/consensus_object_pools/block_clearance.nim
index 2792f6d4d..1d010acec 100644
--- a/beacon_chain/consensus_object_pools/block_clearance.nim
+++ b/beacon_chain/consensus_object_pools/block_clearance.nim
@@ -266,7 +266,7 @@ proc addHeadBlockWithParent*(
   var cache = StateCache()
 
   # We've verified that the slot of the new block is newer than that of the
-  # parent, so we should now be able to create an approriate clearance state
+  # parent, so we should now be able to create an appropriate clearance state
   # onto which we can apply the new block
   let clearanceBlock = BlockSlotId.init(parent.bid, signedBlock.message.slot)
   if not updateState(
diff --git a/beacon_chain/consensus_object_pools/block_pools_types.nim b/beacon_chain/consensus_object_pools/block_pools_types.nim
index d7f4c34d5..6235ea2bf 100644
--- a/beacon_chain/consensus_object_pools/block_pools_types.nim
+++ b/beacon_chain/consensus_object_pools/block_pools_types.nim
@@ -89,7 +89,7 @@ type
     ## instantiated: sync from genesis or checkpoint, and therefore, what
     ## features we can offer in terms of historical replay.
     ##
-    ## Beacuse the state transition is forwards-only, checkpoint sync generally
+    ## Because the state transition is forwards-only, checkpoint sync generally
     ## allows replaying states from that point onwards - anything earlier
     ## would require a backfill of blocks and a subsequent replay from genesis.
     ##
diff --git a/nix/default.nix b/nix/default.nix
index a84a538e2..6e61e80c1 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -59,11 +59,7 @@ in stdenv.mkDerivation rec {
     pushd vendor/nimbus-build-system/vendor/Nim
     mkdir dist
     cp -r ${callPackage ./nimble.nix {}}    dist/nimble
-    chmod 777 -R dist/nimble
-    mkdir -p dist/nimble/dist
-    cp -r ${callPackage ./sat.nix {}}       dist/nimble/dist/sat
-    cp -r ${callPackage ./checksums.nix {}} dist/checksums  # need both
-    cp -r ${callPackage ./checksums.nix {}} dist/nimble/dist/checksums
+    cp -r ${callPackage ./checksums.nix {}} dist/checksums
     cp -r ${callPackage ./csources.nix {}}  csources_v2
     chmod 777 -R dist/nimble csources_v2
     popd
diff --git a/nix/nimble.nix b/nix/nimble.nix
index 5343aaa81..39c5e0fff 100644
--- a/nix/nimble.nix
+++ b/nix/nimble.nix
@@ -6,7 +6,8 @@ let
 in pkgs.fetchFromGitHub {
   owner = "nim-lang";
   repo = "nimble";
+  fetchSubmodules = true;
   rev = tools.findKeyValue "^ +NimbleStableCommit = \"([a-f0-9]+)\".+" sourceFile;
   # WARNING: Requires manual updates when Nim compiler version changes.
-  hash = "sha256-sa0irAZjQRZLduEMBPf7sHlY1FigBJTR/vIH4ihii/w=";
+  hash = "sha256-Rz48sGUKZEAp+UySla+MlsOfsERekuGKw69Tm11fDz8=";
 }
diff --git a/vendor/nimbus-build-system b/vendor/nimbus-build-system
index 8fafcd0ba..4c6ff070c 160000
--- a/vendor/nimbus-build-system
+++ b/vendor/nimbus-build-system
@@ -1 +1 @@
-Subproject commit 8fafcd0bac9f409091b7bcaee62ab6330f57441e
+Subproject commit 4c6ff070c116450bb2c285691724ac9e6202cb28