diff --git a/test-requirements.txt b/test-requirements.txt
index d25ed6f..d9c3271 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,8 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 hacking<0.11,>=0.10.0
-mock>=1.0
+mock>=1.1;python_version!='2.6'
+mock==1.0.1;python_version=='2.6'
 netaddr>=0.7.12
 
 # this is required for the docs build jobs