diff --git a/backend/export/property_scenarios/main.py b/backend/export/property_scenarios/main.py
index 56886a8b..eb97df2f 100644
--- a/backend/export/property_scenarios/main.py
+++ b/backend/export/property_scenarios/main.py
@@ -99,7 +99,7 @@ def process_export(payload: ExportRequest, session: Session) -> Dict[Union[str,
 # Lambda Handler
 # ============================================================
 
-def handler(event: dict, context: Optional[Any]) -> Mapping[str, int | str]:
+def handler(event: Mapping[str, Any], context: Optional[Any]) -> Mapping[str, int | str]:
     """
     Lambda event should have the following structure:
     1) task id - unique identifier for the export task (optional, can be used for tracking/logging)