diff --git a/.gitmodules b/.gitmodules
index 069ca5c..44a5029 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "third_party/grpc-proto"]
 	path = third_party/grpc-proto
 	url = https://git.anthrove.art/Anthrove/grpc-proto.git
-	branch = release/v3.2.0
+	branch = release/v4.0.0