diff --git a/api/api.proto b/api/api.proto
index 9a7534cf6..2505fa48d 100644
--- a/api/api.proto
+++ b/api/api.proto
@@ -1051,6 +1051,8 @@ message Return {
     SERVER_BUSY = 9;
     NO_CONNECTION = 10;
     NOT_ENOUGH_EFFECTIVE_CONNECTION = 11;
+    BLOCK_UNSOLIDIFIED = 12;
+
     OTHER_ERROR = 20;
   }
 
diff --git a/core/Tron.proto b/core/Tron.proto
index 2fc08901e..41ef968d9 100644
--- a/core/Tron.proto
+++ b/core/Tron.proto
@@ -626,6 +626,7 @@ message HelloMessage {
   bytes signature = 8;
   int32 nodeType = 9;
   int64 lowestBlockNum = 10;
+  bytes codeVersion = 11;
 }
 
 message InternalTransaction {