diff --git a/remote/ethbackend.proto b/remote/ethbackend.proto
index 7406b8f..03f0b1b 100644
--- a/remote/ethbackend.proto
+++ b/remote/ethbackend.proto
@@ -70,10 +70,9 @@ message EngineExecutePayloadReply {
 }
 
 message EnginePreparePayload {
-  types.H256 parentHash = 1;
-  uint64 timestamp = 2;
-  types.H256 random = 3;
-  types.H160 feeRecipient = 4;
+  uint64 timestamp = 1;
+  types.H256 random = 2;
+  types.H160 feeRecipient = 3;
 }
 
 message EngineForkChoiceUpdated {
@@ -83,8 +82,8 @@ message EngineForkChoiceUpdated {
 }
 
 message EngineForkChoiceUpdatedRequest {
-  EnginePreparePayload headBlockHash = 1;
-  EngineForkChoiceUpdated safeBlockHash = 2;
+  EngineForkChoiceUpdated forkchoice = 1;
+  EnginePreparePayload prepare = 2;
 }
 
 message EngineForkChoiceUpdatedReply {
diff --git a/types/types.proto b/types/types.proto
index 3e6c7eb..9397aad 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -65,7 +65,7 @@ message ExecutionPayload {
   uint64 gasLimit = 8;
   uint64 gasUsed = 9;
   uint64 timestamp = 10;
-  types.H256 extraData = 11;
+  bytes extraData = 11;
   types.H256 baseFeePerGas = 12;
   types.H256 blockHash = 13;
   /*