diff --git a/canopen/version.py b/canopen/version.py
index d79dd2b5..4ec40078 100644
--- a/canopen/version.py
+++ b/canopen/version.py
@@ -1,2 +1,2 @@
 
-__version__ = "0.4.0.dev9"
+__version__ = "0.4.0"