diff --git a/requirements.txt b/requirements.txt
index 192b6a0a8..d45fb6976 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Twisted==16.6.0
-cryptography==1.9
+cryptography==2.0.3
 appdirs==1.4.3
 argparse==1.2.1
 docopt==0.6.2