diff --git a/src/dapla/auth.py b/src/dapla/auth.py
index 112e52b..03d4f8d 100644
--- a/src/dapla/auth.py
+++ b/src/dapla/auth.py
@@ -108,7 +108,7 @@ def fetch_local_user_from_jupyter() -> dict[str, Any]:
             raise AuthError
 
     @staticmethod
-    def fetch_google_credentials() -> Credentials:
+    def fetch_google_credentials() -> Optional[Credentials]:
         """Fetches the Google credentials for the current user.
 
         Returns: