diff --git a/beacon_chain/spec/state_transition.nim b/beacon_chain/spec/state_transition.nim
index d74400115f..6b8cb9ded6 100644
--- a/beacon_chain/spec/state_transition.nim
+++ b/beacon_chain/spec/state_transition.nim
@@ -403,7 +403,8 @@ proc makeBeaconBlock*(
     # removed if we don't use invalid signatures there
     verificationFlags: UpdateFlags,
     transactions_root: Opt[Eth2Digest],
-    execution_payload_root: Opt[Eth2Digest]):
+    execution_payload_root: Opt[Eth2Digest],
+    kzg_commitments: Opt[KzgCommitments]):
     Result[ForkedBeaconBlock, cstring] =
   ## Create a block for the given state. The latest block applied to it will
   ## be used for the parent_root value, and the slot will be take from
@@ -428,7 +429,7 @@ proc makeBeaconBlock*(
       rollback(state)
       return err(res.error())
 
-    # Override for MEV
+    # Override for Builder API
     if transactions_root.isSome and execution_payload_root.isSome:
       withState(state):
         when consensusFork < ConsensusFork.Capella:
@@ -455,6 +456,9 @@ proc makeBeaconBlock*(
              execution_payload_root.get,
              hash_tree_root(validator_changes.bls_to_execution_changes)])
         elif consensusFork == ConsensusFork.Deneb:
+          forkyState.data.latest_execution_payload_header.transactions_root =
+            transactions_root.get
+
           when executionPayload is deneb.ExecutionPayloadForSigning:
             # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/beacon-chain.md#beaconblockbody
             forkyState.data.latest_block_header.body_root = hash_tree_root(
@@ -469,7 +473,7 @@ proc makeBeaconBlock*(
                hash_tree_root(sync_aggregate),
                execution_payload_root.get,
                hash_tree_root(validator_changes.bls_to_execution_changes),
-               hash_tree_root(executionPayload.kzgs)
+               hash_tree_root(kzg_commitments.get)
             ])
           else:
             raiseAssert "Attempt to use non-Deneb payload with post-Deneb state"
@@ -517,7 +521,8 @@ proc makeBeaconBlock*(
     attestations, deposits, validator_changes, sync_aggregate,
     executionPayload, rollback, cache,
     verificationFlags = {}, transactions_root = Opt.none Eth2Digest,
-    execution_payload_root = Opt.none Eth2Digest)
+    execution_payload_root = Opt.none Eth2Digest,
+    kzg_commitments = Opt.none KzgCommitments)
 
 proc makeBeaconBlock*(
     cfg: RuntimeConfig, state: var ForkedHashedBeaconState,
@@ -536,4 +541,5 @@ proc makeBeaconBlock*(
     executionPayload, rollback, cache,
     verificationFlags = verificationFlags,
     transactions_root = Opt.none Eth2Digest,
-    execution_payload_root = Opt.none Eth2Digest)
+    execution_payload_root = Opt.none Eth2Digest,
+    kzg_commitments = Opt.none KzgCommitments)
diff --git a/beacon_chain/validators/beacon_validators.nim b/beacon_chain/validators/beacon_validators.nim
index 30afdaa927..7face4f0d2 100644
--- a/beacon_chain/validators/beacon_validators.nim
+++ b/beacon_chain/validators/beacon_validators.nim
@@ -440,7 +440,8 @@ proc makeBeaconBlockForHeadAndSlot*(
     execution_payload: Opt[PayloadType],
     transactions_root: Opt[Eth2Digest],
     execution_payload_root: Opt[Eth2Digest],
-    withdrawals_root: Opt[Eth2Digest]):
+    withdrawals_root: Opt[Eth2Digest],
+    kzg_commitments: Opt[KzgCommitments]):
     Future[ForkedBlockResult] {.async.} =
   # Advance state to the slot that we're proposing for
   var cache = StateCache()
@@ -528,7 +529,8 @@ proc makeBeaconBlockForHeadAndSlot*(
       cache,
       verificationFlags = {},
       transactions_root = transactions_root,
-      execution_payload_root = execution_payload_root).mapErr do (error: cstring) -> string:
+      execution_payload_root = execution_payload_root,
+      kzg_commitments = kzg_commitments).mapErr do (error: cstring) -> string:
     # This is almost certainly a bug, but it's complex enough that there's a
     # small risk it might happen even when most proposals succeed - thus we
     # log instead of asserting
@@ -560,7 +562,8 @@ proc makeBeaconBlockForHeadAndSlot*(
     execution_payload = Opt.none(PayloadType),
     transactions_root = Opt.none(Eth2Digest),
     execution_payload_root = Opt.none(Eth2Digest),
-    withdrawals_root = Opt.none(Eth2Digest))
+    withdrawals_root = Opt.none(Eth2Digest),
+    kzg_commitments = Opt.none(KzgCommitments))
 
 proc getBlindedExecutionPayload[
     EPH: capella.ExecutionPayloadHeader |
@@ -846,6 +849,7 @@ proc getBlindedBlockParts[
     template actualEPH: untyped = executionPayloadHeader.get.blindedBlckPart
     let withdrawals_root =
       Opt.some executionPayloadHeader.get.blindedBlckPart.withdrawals_root
+    const kzg_commitments = Opt.none KzgCommitments
 
     var shimExecutionPayload: PayloadType
     copyFields(
@@ -855,7 +859,10 @@ proc getBlindedBlockParts[
     type PayloadType = deneb.ExecutionPayloadForSigning
     template actualEPH: untyped =
       executionPayloadHeader.get.blindedBlckPart.execution_payload_header
-    let withdrawals_root = Opt.some actualEPH.withdrawals_root
+    let
+      withdrawals_root = Opt.some actualEPH.withdrawals_root
+      kzg_commitments = Opt.some(
+        executionPayloadHeader.get.blindedBlckPart.blinded_blobs_bundle.commitments)
 
     var shimExecutionPayload: PayloadType
     type DenebEPH =
@@ -870,7 +877,8 @@ proc getBlindedBlockParts[
     execution_payload = Opt.some shimExecutionPayload,
     transactions_root = Opt.some actualEPH.transactions_root,
     execution_payload_root = Opt.some hash_tree_root(actualEPH),
-    withdrawals_root = withdrawals_root)
+    withdrawals_root = withdrawals_root,
+    kzg_commitments = kzg_commitments)
 
   if newBlock.isErr():
     # Haven't committed to the MEV block, so allow EL fallback.