diff --git a/connections/implementation/proto/offline_wire_formats.proto b/connections/implementation/proto/offline_wire_formats.proto
index 1044ecee..81a0996a 100644
--- a/connections/implementation/proto/offline_wire_formats.proto
+++ b/connections/implementation/proto/offline_wire_formats.proto
@@ -418,6 +418,7 @@ message AutoResumeFrame {
   optional EventType event_type = 1;
   optional int64 pending_payload_id = 2;
   optional int32 next_payload_chunk_index = 3;
+  optional int32 version = 4;
 }
 
 message AutoReconnectFrame {