diff --git a/setup.py b/setup.py
index 492ccaae4..b607a6a45 100644
--- a/setup.py
+++ b/setup.py
@@ -133,7 +133,7 @@ def build_extension(self, ext):
 # logic and declaration, and simpler if you include description/version in a file.
 setup(
     name="mjx",
-    version="0.0.3",
+    version="0.0.4",
     author="Mjx Project Team",
     author_email="koyamada-s@sys.i.kyoto-u.ac.jp",
     description="",