diff --git a/optuna_dashboard/streamlit/_streamlit_helper.py b/optuna_dashboard/streamlit/_streamlit_helper.py
index 814a6327..e6e92307 100644
--- a/optuna_dashboard/streamlit/_streamlit_helper.py
+++ b/optuna_dashboard/streamlit/_streamlit_helper.py
@@ -4,6 +4,7 @@ from typing import TYPE_CHECKING
 
 import optuna
 from optuna.trial import FrozenTrial
+
 import streamlit as st
 
 from .._form_widget import get_form_widgets_json