diff --git a/optuna_dashboard/_pareto_front.py b/optuna_dashboard/_pareto_front.py
index f6af6831..7754d887 100644
--- a/optuna_dashboard/_pareto_front.py
+++ b/optuna_dashboard/_pareto_front.py
@@ -2,6 +2,7 @@
 # https://github.com/optuna/optuna/blob/v3.0.5/optuna/study/_multi_objective.py
 
 from __future__ import annotations
+
 from typing import Optional
 from typing import Sequence