diff --git a/.github/workflows/exp.yml b/.github/workflows/exp.yml
index 13dcaff..c527fb7 100644
--- a/.github/workflows/exp.yml
+++ b/.github/workflows/exp.yml
@@ -23,6 +23,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 2 # get parent
 
       - name: Report
         shell: bash