diff --git a/requirements.txt b/requirements.txt
index f08a6c08..79633b69 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-cryptography==2.3.1
+cryptography==2.7
 jsonschema==2.6.0
 lxml==4.2.1
 ndg-httpsclient==0.5.0