diff --git a/rpc_util.go b/rpc_util.go
index eae2264b..07d03a85 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -510,6 +510,6 @@ const (
 )
 
 // Version is the current grpc version.
-const Version = "1.8.0-dev"
+const Version = "1.9.0-dev"
 
 const grpcUA = "grpc-go/" + Version