diff --git a/requirements.txt b/requirements.txt
index 645eafb0d..98ef334b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 boto3==1.4.7
+cffi==1.11.0
 celery==3.1.25 # pyup: <4
 docopt==0.6.2
 Flask-Bcrypt==0.7.1