diff --git a/test-requirements.txt b/test-requirements.txt
index e1891ca6..b64bb4bb 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,8 @@ coverage>=3.6
 discover
 fixtures>=1.3.1
 requests-mock>=0.6.0 # Apache-2.0
-mock>=1.0
+mock>=1.1;python_version!='2.6'
+mock==1.0.1;python_version=='2.6'
 mox3>=0.7.0
 oslosphinx>=2.5.0 # Apache-2.0
 oslotest>=1.5.1 # Apache-2.0