diff --git a/setup.py b/setup.py
index 750a6bd..fdd2c42 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
   install_requires=[
     'autobahn==17.6.2',
     'twisted==17.5.0',
-    'cryptography==2.0.3',
+    'cryptography==2.3',
     'pyOpenSSL==17.1.0',
     'pgpy==0.4.2',
     'six==1.10.0'