diff --git a/actions/github-app-auth/action.yml b/actions/github-app-auth/action.yml
index dfe9a3c..7a0f1b7 100644
--- a/actions/github-app-auth/action.yml
+++ b/actions/github-app-auth/action.yml
@@ -19,10 +19,12 @@ runs:
       permission-contents: write
   - name: Get GitHub App User ID
     id: get-user-id
+    shell: bash
     run: echo "user-id=$(gh api "/users/${{ steps.app-token.outputs.app-slug }}[bot]" --jq .id)" >> "$GITHUB_OUTPUT"
     env:
       GH_TOKEN: ${{ steps.app-token.outputs.token }}
   - name: Set Git environment
+    shell: bash
     run: |
       git config --global user.name '${{ steps.app-token.outputs.app-slug }}[bot]'
       git config --global user.email '${{ steps.get-user-id.outputs.user-id }}+${{ steps.app-token.outputs.app-slug }}[bot]@users.noreply.github.com'