diff --git a/test-requirements.txt b/test-requirements.txt
index ab13bd4d..fa2aec27 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -22,4 +22,5 @@ sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 oslosphinx>=2.5.0 # Apache-2.0
 
 # mocking framework
-mock>=1.0
+mock>=1.1;python_version!='2.6'
+mock==1.0.1;python_version=='2.6'