diff --git a/.github/workflows/publish-gem.yml b/.github/workflows/publish-gem.yml
index bcaf634..8d696ec 100644
--- a/.github/workflows/publish-gem.yml
+++ b/.github/workflows/publish-gem.yml
@@ -12,7 +12,7 @@ jobs:
     steps:
     - uses: actions/checkout@master
       with:
-        ref: ${GITHUB_REF}
+        ref: "${{ github.event.release.tag_name }}"
     - name: Set up Ruby 2.6
       uses: actions/setup-ruby@v1
       with: