diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
index 426371f..1a4bb04 100644
--- a/.github/workflows/mirror.yml
+++ b/.github/workflows/mirror.yml
@@ -13,6 +13,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         ref: ${{ github.head_ref }}
+        fetch-depth: 0
     - name: load ssh key
       env:
         SSH_AUTH_SOCK: /tmp/ssh_agent.sock