diff --git a/optuna_integration/version.py b/optuna_integration/version.py
index afdb35b5..70397087 100644
--- a/optuna_integration/version.py
+++ b/optuna_integration/version.py
@@ -1 +1 @@
-__version__ = "4.1.0.dev"
+__version__ = "4.1.0"