diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..44a5029
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "third_party/grpc-proto"]
+	path = third_party/grpc-proto
+	url = https://git.anthrove.art/Anthrove/grpc-proto.git
+	branch = release/v4.0.0
diff --git a/third_party/grpc-proto b/third_party/grpc-proto
new file mode 160000
index 0000000..1c64286
--- /dev/null
+++ b/third_party/grpc-proto
@@ -0,0 +1 @@
+Subproject commit 1c642867c2b6deee50c9997dafe721eb2e76ebbc