diff --git a/stubs/Authlib/authlib/oauth2/client.pyi b/stubs/Authlib/authlib/oauth2/client.pyi
index c502a92b5e67..ec4028af4372 100644
--- a/stubs/Authlib/authlib/oauth2/client.pyi
+++ b/stubs/Authlib/authlib/oauth2/client.pyi
@@ -62,7 +62,16 @@ class OAuth2Client:
     def refresh_token(self, url=None, refresh_token=None, body: str = "", auth=None, headers=None, **kwargs): ...
     def ensure_active_token(self, token=None): ...
     def revoke_token(self, url, token=None, token_type_hint=None, body=None, auth=None, headers=None, **kwargs): ...
-    def introspect_token(self, url, token=None, token_type_hint=None, body=None, auth=None, headers=None, **kwargs): ...
+    def introspect_token(
+        self,
+        url: str,
+        token: str | None = None,
+        token_type_hint: str | None = None,
+        body: str | None = None,
+        auth=None,
+        headers=None,
+        **kwargs,
+    ): ...
     def register_compliance_hook(self, hook_type, hook) -> None: ...
     def parse_response_token(self, resp): ...
     def __del__(self) -> None: ...