diff --git a/setup.py b/setup.py
index acc1cf09..7371881c 100644
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,7 @@ install_requires = [
     'six==1.9.0',
     'gunicorn==19.3.0',
     'pycrypto==2.6.1',
-    'cryptography==1.0dev',
+    'cryptography>=1.0dev',
     'pyopenssl==0.15.1',
     'pyjwt==1.0.1',
     'xmltodict==0.9.2'