diff --git a/web3/engine_api.nim b/web3/engine_api.nim
index 5a6b2f8..5917887 100644
--- a/web3/engine_api.nim
+++ b/web3/engine_api.nim
@@ -24,6 +24,12 @@ template forkchoiceUpdated*(
     payloadAttributes: Option[PayloadAttributesV2]): Future[ForkchoiceUpdatedResponse] =
   engine_forkchoiceUpdatedV2(rpcClient, forkchoiceState, payloadAttributes)
 
+template forkchoiceUpdated*(
+    rpcClient: RpcClient,
+    forkchoiceState: ForkchoiceStateV1,
+    payloadAttributes: Option[PayloadAttributesV3]): Future[ForkchoiceUpdatedResponse] =
+  engine_forkchoiceUpdatedV3(rpcClient, forkchoiceState, payloadAttributes)
+
 template getPayload*(
     rpcClient: RpcClient,
     T: type ExecutionPayloadV1,
@@ -61,5 +67,7 @@ template newPayload*(
 template newPayload*(
     rpcClient: RpcClient,
     payload: ExecutionPayloadV3,
-    versioned_hashes: seq[VersionedHash]): Future[PayloadStatusV1] =
-  engine_newPayloadV3(rpcClient, payload, versioned_hashes)
+    versionedHashes: seq[VersionedHash],
+    parentBeaconBlockRoot: FixedBytes[32]): Future[PayloadStatusV1] =
+  engine_newPayloadV3(
+    rpcClient, payload, versionedHashes, parentBeaconBlockRoot)
diff --git a/web3/engine_api_callsigs.nim b/web3/engine_api_callsigs.nim
index 2c35987..4d0b248 100644
--- a/web3/engine_api_callsigs.nim
+++ b/web3/engine_api_callsigs.nim
@@ -1,5 +1,6 @@
 # https://github.com/ethereum/execution-apis/blob/v1.0.0-beta.3/src/engine/paris.md#methods
 # https://github.com/ethereum/execution-apis/blob/v1.0.0-beta.3/src/engine/shanghai.md#methods
+# https://github.com/ethereum/execution-apis/blob/ee3df5bc38f28ef35385cefc9d9ca18d5e502778/src/engine/cancun.md#methods
 
 import ethtypes, engine_api_types
 
@@ -8,6 +9,7 @@ proc engine_newPayloadV2(payload: ExecutionPayloadV2): PayloadStatusV1
 proc engine_newPayloadV3(payload: ExecutionPayloadV3, versioned_hashes: seq[VersionedHash]): PayloadStatusV1
 proc engine_forkchoiceUpdatedV1(forkchoiceState: ForkchoiceStateV1, payloadAttributes: Option[PayloadAttributesV1]): ForkchoiceUpdatedResponse
 proc engine_forkchoiceUpdatedV2(forkchoiceState: ForkchoiceStateV1, payloadAttributes: Option[PayloadAttributesV2]): ForkchoiceUpdatedResponse
+proc engine_forkchoiceUpdatedV3(forkchoiceState: ForkchoiceStateV1, payloadAttributes: Option[PayloadAttributesV3]): ForkchoiceUpdatedResponse
 proc engine_getPayloadV1(payloadId: PayloadID): ExecutionPayloadV1
 proc engine_getPayloadV2(payloadId: PayloadID): GetPayloadV2Response
 proc engine_getPayloadV2_exact(payloadId: PayloadID): GetPayloadV2ResponseExact
diff --git a/web3/engine_api_types.nim b/web3/engine_api_types.nim
index 5a307bd..de707d1 100644
--- a/web3/engine_api_types.nim
+++ b/web3/engine_api_types.nim
@@ -25,6 +25,14 @@ type
     suggestedFeeRecipient*: Address
     withdrawals*: seq[WithdrawalV1]
 
+  # https://github.com/ethereum/execution-apis/blob/ee3df5bc38f28ef35385cefc9d9ca18d5e502778/src/engine/cancun.md#payloadattributesv3
+  PayloadAttributesV3* = object
+    timestamp*: Quantity
+    prevRandao*: FixedBytes[32]
+    suggestedFeeRecipient*: Address
+    withdrawals*: seq[WithdrawalV1]
+    parentBeaconBlockRoot*: FixedBytes[32]
+
   # This is ugly, but see the comment on ExecutionPayloadV1OrV2.
   PayloadAttributesV1OrV2* = object
     timestamp*: Quantity
@@ -73,7 +81,7 @@ type
     executionPayload*: ExecutionPayloadV2
     blockValue*: UInt256
 
-  # https://github.com/ethereum/execution-apis/blob/v1.0.0-beta.3/src/engine/experimental/blob-extension.md#response-1
+  # https://github.com/ethereum/execution-apis/blob/ee3df5bc38f28ef35385cefc9d9ca18d5e502778/src/engine/cancun.md#response-2
   GetPayloadV3Response* = object
     executionPayload*: ExecutionPayloadV3
     blockValue*: UInt256
diff --git a/web3/ethtypes.nim b/web3/ethtypes.nim
index b25f99e..e234fb2 100644
--- a/web3/ethtypes.nim
+++ b/web3/ethtypes.nim
@@ -293,7 +293,7 @@ type
     transactions*: seq[TypedTransaction]
     withdrawals*: Option[seq[WithdrawalV1]]
 
-  # https://github.com/ethereum/execution-apis/pull/417
+  # https://github.com/ethereum/execution-apis/blob/ee3df5bc38f28ef35385cefc9d9ca18d5e502778/src/engine/cancun.md#executionpayloadv3
   ExecutionPayloadV3* = object
     parentHash*: Hash256
     feeRecipient*: Address
@@ -318,7 +318,7 @@ type
     ExecutionPayloadV2 |
     ExecutionPayloadV3
 
-  # https://github.com/ethereum/execution-apis/blob/v1.0.0-beta.3/src/engine/experimental/blob-extension.md#BlobsBundleV1
+  # https://github.com/ethereum/execution-apis/blob/ee3df5bc38f28ef35385cefc9d9ca18d5e502778/src/engine/cancun.md#blobsbundlev1
   BlobsBundleV1* = object
     commitments*: seq[KZGCommitment]
     proofs*: seq[KZGProof]