diff --git a/masque/__init__.py b/masque/__init__.py
index 38925c1..0f478d6 100644
--- a/masque/__init__.py
+++ b/masque/__init__.py
@@ -106,5 +106,5 @@ from .utils import (
 
 __author__ = 'Jan Petykiewicz'
 
-__version__ = '3.4'
+__version__ = '4.0a1'
 version = __version__       # legacy