diff --git a/setup.py b/setup.py
index 3a56e73b..cec4ad78 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ install_requires = [
     'six>=1.9.0',
     'gunicorn>=19.3.0',
     'pycrypto>=2.6.1',
-    'cryptography>=0.9',
+    'cryptography>=1.0dev',
     'pyopenssl>=0.15.1',
     'pyjwt>=1.0.1',
     'xmltodict>=0.9.2'