diff --git a/.github/actions/check_style/action.yml b/.github/actions/check_style/action.yml
index 74bb871bf5..1577377911 100644
--- a/.github/actions/check_style/action.yml
+++ b/.github/actions/check_style/action.yml
@@ -22,3 +22,9 @@ runs:
       run: |
         export SQUAWK_GITHUB_TOKEN=${{ github.token }}
         . ./script/squawk
+
+    - uses: bufbuild/buf-setup-action@v1
+    - uses: bufbuild/buf-breaking-action@v1
+      with:
+        input: "crates/rpc/proto/"
+        against: "https://github.com/${GITHUB_REPOSITORY}.git#branch=main,subdir=crates/rpc/proto/"