diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 13d67be..338cfb0 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -20,6 +20,7 @@ jobs:
         name: Authenticate to Google Cloud
         uses: google-github-actions/auth@v2
         with:
+          token_format: 'access_token'
           workload_identity_provider: ${{ secrets.WORKLOAD_IDENTITY_PROVIDER }}
           service_account: ${{ secrets.SERVICE_ACCOUNT }}