diff --git a/.github/workflows/publish-gem-package.yml b/.github/workflows/publish-gem-package.yml
index 49375ec..d7674ec 100644
--- a/.github/workflows/publish-gem-package.yml
+++ b/.github/workflows/publish-gem-package.yml
@@ -45,6 +45,7 @@ jobs:
         ---
         :github: Bearer ${GITHUB_TOKEN}
         EOF
+        chmod 0600 ~/.gem/credentials
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     - name: publish package