diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7f8d80b..80e31b8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -34,3 +34,5 @@ jobs:
           echo 'syntax = "proto3"; message A { string a = 1; }' >> test.proto
       - name: Validate Action
         uses: ./
+        with:
+          against: 'https://github.com/bufbuild/setup-breaking-action.git#branch=main'