diff --git a/test-requirements.txt b/test-requirements.txt
index c98855c..b4a3f4a 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -12,4 +12,4 @@ python-subunit>=0.0.18
 sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
 testrepository>=0.0.18
 testscenarios>=0.4
-testtools>=0.9.36,!=1.2.0
+testtools>=0.9.36,!=1.2.0,!=1.4.0