diff --git a/requirements.txt b/requirements.txt
index 40b0b707fea..a7fef0b9b42 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+cffi>=1.8
 cryptography==1.4
 Django==1.10
 django-debug-toolbar==1.4