diff --git a/schema.py b/schema.py
index f79c977..8122371 100644
--- a/schema.py
+++ b/schema.py
@@ -4,7 +4,7 @@
 
 import re
 
-__version__ = '0.6.3'
+__version__ = '0.6.4'
 __all__ = ['Schema',
            'And', 'Or', 'Regex', 'Optional',
            'SchemaError',