diff --git a/optuna_dashboard/_app.py b/optuna_dashboard/_app.py
index b6c02c2d..ceeda084 100644
--- a/optuna_dashboard/_app.py
+++ b/optuna_dashboard/_app.py
@@ -43,10 +43,11 @@ from ._serializer import serialize_study_summary
 
 if typing.TYPE_CHECKING:
     from _typeshed.wsgi import WSGIApplication
+
     try:
         from optuna.study._frozen import FrozenStudy
     except ImportError:
-        FrozenStudy = None
+        FrozenStudy = None  # type: ignore
 
 BottleViewReturn = Union[str, bytes, Dict[str, Any], BaseResponse]
 BottleView = TypeVar("BottleView", bound=Callable[..., BottleViewReturn])
@@ -141,10 +142,7 @@ def json_api_view(view: BottleView) -> BottleView:
 def get_study_summaries(storage: BaseStorage) -> List[StudySummary]:
     if version.parse(optuna_ver) >= version.Version("3.0.0rc0.dev"):
         frozen_studies = storage.get_all_studies()  # type: ignore
-        return [
-            _frozen_study_to_study_summary(s)
-            for s in frozen_studies
-        ]
+        return [_frozen_study_to_study_summary(s) for s in frozen_studies]
     elif version.parse(optuna_ver) >= version.Version("3.0.0b0.dev"):
         return storage.get_all_study_summaries(include_best_trial=False)  # type: ignore
     else:
diff --git a/python_tests/test_api.py b/python_tests/test_api.py
index ad981187..5a795c71 100644
--- a/python_tests/test_api.py
+++ b/python_tests/test_api.py
@@ -1,25 +1,13 @@
 import json
-from typing import List
 from unittest import TestCase
 
 import optuna
-from optuna.storages import BaseStorage
-from optuna.study import StudySummary
-from optuna.version import __version__ as optuna_ver
+from optuna import get_all_study_summaries
 from optuna_dashboard._app import create_app
-from packaging import version
 
 from .wsgi_client import send_request
 
 
-def get_all_study_summaries(storage: BaseStorage) -> List[StudySummary]:
-    if version.parse(optuna_ver) >= version.Version("3.0.0b0.dev"):
-        summaries = storage.get_all_study_summaries(include_best_trial=True)  # type: ignore
-    else:
-        summaries = storage.get_all_study_summaries()  # type: ignore
-    return summaries
-
-
 def objective(trial: optuna.trial.Trial) -> float:
     x = trial.suggest_float("x", -1, 1)
     return x
diff --git a/visual_regression_test.py b/visual_regression_test.py
index 13ce514f..3e259d7f 100644
--- a/visual_regression_test.py
+++ b/visual_regression_test.py
@@ -9,9 +9,8 @@ from typing import Tuple
 from wsgiref.simple_server import make_server
 
 import optuna
-from optuna.version import __version__ as optuna_ver
+from optuna import get_all_study_summaries
 from optuna_dashboard import wsgi
-from packaging import version
 from pyppeteer import launch
 from pyppeteer.page import Page
 
@@ -186,10 +185,7 @@ async def take_screenshots(storage: optuna.storages.BaseStorage) -> List[str]:
         time.sleep(1)
         await page.screenshot({"path": os.path.join(args.output_dir, "study-list.png")})
 
-    if version.parse(optuna_ver) >= version.Version("3.0.0b0.dev"):
-        summaries = storage.get_all_study_summaries(include_best_trial=True)  # type: ignore
-    else:
-        summaries = storage.get_all_study_summaries()  # type: ignore
+    summaries = get_all_study_summaries(storage)
     study_ids = {s._study_id: s.study_name for s in summaries}
     for study_id, study_name in study_ids.items():
         await page.goto(f"http://{args.host}:{args.port}/dashboard/studies/{study_id}")