diff --git a/setup.py b/setup.py
index e1f6511a..b3b3945d 100755
--- a/setup.py
+++ b/setup.py
@@ -161,7 +161,7 @@ setup(
         'paramiko',
         'pdfrw',
         'httplib2',
-        'xmlschema',
+        'xmlschema<2.1',
         'pytz',
         'vobject',
         'Levenshtein',