diff --git a/.github/workflows/sanity_check.yml b/.github/workflows/sanity_check.yml
index 02aa600b0..69f7bd74f 100644
--- a/.github/workflows/sanity_check.yml
+++ b/.github/workflows/sanity_check.yml
@@ -17,6 +17,7 @@ jobs:
         echo git status && git status
         echo "git remote -v" && git remote -v
         echo git branch && git branch
+        git merge-base upstream/master HEAD
 
     - name: Setup Python
       uses: actions/setup-python@v1