diff --git a/execution/execution.proto b/execution/execution.proto
index 8356e09..576f258 100644
--- a/execution/execution.proto
+++ b/execution/execution.proto
@@ -131,6 +131,7 @@ message AssembleBlockRequest {
     repeated bytes transactions = 7;
     bool no_tx_pool = 8;
     optional uint64 gas_limit = 9;
+    optional bytes eip_1559_params = 10;
 }
 
 message AssembleBlockResponse {