diff --git a/test-requirements.txt b/test-requirements.txt
index 470eb04e4..75c66a9d7 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -12,6 +12,7 @@ redis
 pymongo>=2.5
 
 # Unit testing
+coverage>=3.6
 ddt>=0.4.0
 discover
 fixtures>=0.3.14