diff --git a/src/casdoor/main.py b/src/casdoor/main.py
index fae1427..b9f9ee9 100644
--- a/src/casdoor/main.py
+++ b/src/casdoor/main.py
@@ -78,7 +78,7 @@ def get_oauth_token(
             code: Optional[str] = None,
             username: Optional[str] = None,
             password: Optional[str] = None
-    ) -> str:
+    ) -> dict:
         """
         Request the Casdoor server to get OAuth token.
         Must be set code or username and password for grant type.