diff --git a/anno3d/kitti/scene_uploader.py b/anno3d/kitti/scene_uploader.py
index 9572501..efa59b9 100644
--- a/anno3d/kitti/scene_uploader.py
+++ b/anno3d/kitti/scene_uploader.py
@@ -138,7 +138,7 @@ def _get_task_to_data_dict(
 
         return result_dict
 
-    def _create_tasks(self, project_id: str, task_to_data_dict: Dict[TaskId, List[Tuple[DataId, FilePaths]]]):
+    def _create_tasks(self, project_id: str, task_to_data_dict: Dict[TaskId, List[Tuple[DataId, FilePaths]]]) -> None:
         """タスクを作成します。
 
         Notes: