diff --git a/src/saml2/__init__.py b/src/saml2/__init__.py
index 2bea922..831adf3 100644
--- a/src/saml2/__init__.py
+++ b/src/saml2/__init__.py
@@ -17,7 +17,7 @@
     provides methods and functions to convert SAML classes to and from strings.
 """
 
-__version__ = "4.0.0"
+__version__ = "4.0.1"
 
 import logging
 import six