diff --git a/optuna_dashboard/_preference_setting.py b/optuna_dashboard/_preference_setting.py
index 2310aa03..acc64ccd 100644
--- a/optuna_dashboard/_preference_setting.py
+++ b/optuna_dashboard/_preference_setting.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
 from typing import Any
+from typing import TYPE_CHECKING
 
 from optuna.storages import BaseStorage