diff --git a/.github/workflows/auto-tag.yml b/.github/workflows/auto-tag.yml
index a165682c8..387f71b81 100644
--- a/.github/workflows/auto-tag.yml
+++ b/.github/workflows/auto-tag.yml
@@ -18,8 +18,8 @@ jobs:
     steps:
       - uses: actions/checkout@v7
         with:
-          ref: refs/heads/${{ github.event.pull_request.head.ref }}
-          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.merged && github.event.pull_request.merge_commit_sha || format('refs/heads/{0}', github.event.pull_request.head.ref) }}
+          repository: ${{ github.event.pull_request.merged && github.event.repository.full_name || github.event.pull_request.head.repo.full_name }}
           allow-unsafe-pr-checkout: true
           persist-credentials: false
       - name: get changelog version