diff --git a/test-requirements.txt b/test-requirements.txt
index 542a18ef7..ead68554b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -13,5 +13,5 @@ sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 oslosphinx<2.6.0,>=2.5.0 # Apache-2.0
 testrepository>=0.0.18
 testscenarios>=0.4
-testtools!=1.2.0,>=0.9.36
+testtools!=1.2.0,<2.0.0,>=0.9.36
 tempest-lib<0.5.0,>=0.4.0