diff --git a/app/slack/router.py b/app/slack/router.py
index 987daa2..2b7e567 100644
--- a/app/slack/router.py
+++ b/app/slack/router.py
@@ -65,7 +65,7 @@ async def update_slack_message(response_url: str, message: dict[str, Any]) -> No
 # ============================================================
 
 
-@router.post("/events")
+@router.post("/events", response_model=None)
 async def handle_slack_events(
     request: Request,
     handler: GradCommandHandler,