diff --git a/tianshou/__init__.py b/tianshou/__init__.py
index bc61c15fc..c9416847d 100644
--- a/tianshou/__init__.py
+++ b/tianshou/__init__.py
@@ -1,6 +1,6 @@
 from tianshou import data, env, exploration, policy, trainer, utils
 
-__version__ = "0.4.4"
+__version__ = "0.4.5"
 
 __all__ = [
     "env",