diff --git a/requirements.txt b/requirements.txt
index c848114fd..086a74507 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ six==1.11.0
 unittest-xml-reporting==2.1.1
 uWSGI==2.0.14
 ijson==2.3
+cffi==1.11.5