diff --git a/README.md b/README.md
index 392ad34..0a3d9c0 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,6 @@ jobs:
       name: 'Authenticate to Google Cloud'
       uses: 'google-github-actions/auth@v0'
       with:
-        token_format: 'access_token'
         workload_identity_provider: 'projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider'
         service_account: 'my-service-account@my-project.iam.gserviceaccount.com'