diff --git a/optuna_dashboard/__init__.py b/optuna_dashboard/__init__.py
index 77590db9..ebd9110f 100644
--- a/optuna_dashboard/__init__.py
+++ b/optuna_dashboard/__init__.py
@@ -1,2 +1,5 @@
 from .app import run_server  # noqa
 from .app import wsgi  # noqa
+
+
+__version__ = "0.5.0"
diff --git a/optuna_dashboard/cli.py b/optuna_dashboard/cli.py
index ae4b91b5..146b3218 100644
--- a/optuna_dashboard/cli.py
+++ b/optuna_dashboard/cli.py
@@ -6,8 +6,8 @@ from optuna.storages import BaseStorage
 from optuna.storages import RDBStorage
 from optuna.storages import RedisStorage
 
+from . import __version__
 from .app import create_app
-from .version import __version__
 
 
 AUTO_RELOAD = os.environ.get("OPTUNA_DASHBOARD_AUTO_RELOAD") == "1"
diff --git a/optuna_dashboard/version.py b/optuna_dashboard/version.py
deleted file mode 100644
index 3d187266..00000000
--- a/optuna_dashboard/version.py
+++ /dev/null
@@ -1 +0,0 @@
-__version__ = "0.5.0"
diff --git a/setup.cfg b/setup.cfg
index 1abc769b..cd9f94e9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = optuna-dashboard
-version = attr: optuna_dashboard.version.__version__
+version = attr: optuna_dashboard.__version__
 
 url = https://github.com/optuna/optuna-dashboard
 author = Masashi Shibata