diff --git a/packages/beacon-node/src/chain/errors/executionPayloadBid.ts b/packages/beacon-node/src/chain/errors/executionPayloadBid.ts
index b3d090eb95d0..6d5e41e0bf31 100644
--- a/packages/beacon-node/src/chain/errors/executionPayloadBid.ts
+++ b/packages/beacon-node/src/chain/errors/executionPayloadBid.ts
@@ -12,6 +12,7 @@ export enum ExecutionPayloadBidErrorCode {
   UNKNOWN_PARENT_BLOCK_HASH = "EXECUTION_PAYLOAD_BID_ERROR_UNKNOWN_PARENT_BLOCK_HASH",
   INVALID_SLOT = "EXECUTION_PAYLOAD_BID_ERROR_INVALID_SLOT",
   NOT_LATER_THAN_PARENT = "EXECUTION_PAYLOAD_BID_ERROR_NOT_LATER_THAN_PARENT",
+  INVALID_PREV_RANDAO = "EXECUTION_PAYLOAD_BID_ERROR_INVALID_PREV_RANDAO",
   INVALID_SIGNATURE = "EXECUTION_PAYLOAD_BID_ERROR_INVALID_SIGNATURE",
   NO_MATCHING_PROPOSER_PREFERENCES = "EXECUTION_PAYLOAD_BID_ERROR_NO_MATCHING_PROPOSER_PREFERENCES",
   PROPOSER_PREFERENCES_FEE_RECIPIENT_MISMATCH = "EXECUTION_PAYLOAD_BID_ERROR_PROPOSER_PREFERENCES_FEE_RECIPIENT_MISMATCH",
@@ -43,6 +44,12 @@ export type ExecutionPayloadBidErrorType =
   | {code: ExecutionPayloadBidErrorCode.UNKNOWN_PARENT_BLOCK_HASH; parentBlockHash: RootHex}
   | {code: ExecutionPayloadBidErrorCode.INVALID_SLOT; builderIndex: BuilderIndex; slot: Slot}
   | {code: ExecutionPayloadBidErrorCode.NOT_LATER_THAN_PARENT; parentSlot: Slot; slot: Slot}
+  | {
+      code: ExecutionPayloadBidErrorCode.INVALID_PREV_RANDAO;
+      builderIndex: BuilderIndex;
+      bidPrevRandao: string;
+      expectedPrevRandao: string;
+    }
   | {code: ExecutionPayloadBidErrorCode.INVALID_SIGNATURE; builderIndex: BuilderIndex; slot: Slot}
   | {
       code: ExecutionPayloadBidErrorCode.NO_MATCHING_PROPOSER_PREFERENCES;
diff --git a/packages/beacon-node/src/chain/validation/executionPayloadBid.ts b/packages/beacon-node/src/chain/validation/executionPayloadBid.ts
index 6e062a13d653..47228d6faf2f 100644
--- a/packages/beacon-node/src/chain/validation/executionPayloadBid.ts
+++ b/packages/beacon-node/src/chain/validation/executionPayloadBid.ts
@@ -232,6 +232,18 @@ async function validateExecutionPayloadBid(
     });
   }
 
+  // [REJECT] `bid.prev_randao` is the correct RANDAO mix -- i.e. validate that
+  // `bid.prev_randao == get_randao_mix(parent_state, get_current_epoch(parent_state))`.
+  const randaoMix = state.getRandaoMix(computeEpochAtSlot(state.slot));
+  if (!byteArrayEquals(bid.prevRandao, randaoMix)) {
+    throw new ExecutionPayloadBidError(GossipAction.REJECT, {
+      code: ExecutionPayloadBidErrorCode.INVALID_PREV_RANDAO,
+      builderIndex: bid.builderIndex,
+      bidPrevRandao: toHex(bid.prevRandao),
+      expectedPrevRandao: toHex(randaoMix),
+    });
+  }
+
   // [REJECT] `signed_execution_payload_bid.signature` is valid with respect to the `bid.builder_index`.
   const signatureSet = createSingleSignatureSetFromComponents(
     PublicKey.fromBytes(builder.pubkey),