diff --git a/test-requirements.txt b/test-requirements.txt
index 492886de0..f93050c62 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,3 +2,4 @@ coverage>=3.6
 hacking>=0.8.0,<0.9
 mock>=1.0
 testrepository>=0.0.17
+testtools>=0.9.32,<0.9.35