diff --git a/test-requirements.txt b/test-requirements.txt
index 92fe7e5..9d266dd 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -14,3 +14,4 @@ oslotest>=1.1.0.0a1
 testrepository>=0.0.18
 testscenarios>=0.4
 testtools>=0.9.34
+voluptuous<0.13.0;python_version=='2.7'