diff --git a/test-requirements.txt b/test-requirements.txt
index 36857441c..3a669cb43 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,7 @@
 hacking>=0.9.2,<0.10
 oslotest>=1.2.0  # Apache-2.0
 mock>=1.0
-testtools>=0.9.36,!=1.2.0
+testtools>=0.9.36,!=1.2.0,!=1.4.0
 
 # Used for testing the WBE engine.
 kombu>=2.5.0