diff --git a/.github/actions/rubygems-publish/action.yml b/.github/actions/rubygems-publish/action.yml
index cb76a92f..fb41dd43 100644
--- a/.github/actions/rubygems-publish/action.yml
+++ b/.github/actions/rubygems-publish/action.yml
@@ -22,6 +22,7 @@ runs:
         ruby: ${{ inputs.ruby-version }}
 
     - name: Publish to RubyGems
+      shell: bash
       run: |
         gem build *.gemspec
         gem push *.gem