diff --git a/python_tests/test_csv_download.py b/python_tests/test_csv_download.py
index e1ab12c9..bb4c2bf8 100644
--- a/python_tests/test_csv_download.py
+++ b/python_tests/test_csv_download.py
@@ -1,5 +1,8 @@
+from __future__ import annotations
+
 from typing import Any
 
+
 import optuna
 from optuna.trial import TrialState
 from optuna_dashboard._app import create_app