diff --git a/rpc_util.go b/rpc_util.go
index d61ede64..9b9d3883 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -519,6 +519,6 @@ const SupportPackageIsVersion3 = true
 const SupportPackageIsVersion4 = true
 
 // Version is the current grpc version.
-const Version = "1.5.0-dev"
+const Version = "1.6.0-dev"
 
 const grpcUA = "grpc-go/" + Version