diff --git a/test-requirements.txt b/test-requirements.txt
index c68b2db..d461078 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -11,3 +11,4 @@
 testrepository>=0.0.17
 testtools>=0.9.32
 sphinxcontrib-programoutput
+mock