diff --git a/test-requirements.txt b/test-requirements.txt
index 325478f3..5377940f 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.
 nose
-mock>=1.0
+mock>=1.1;python_version!='2.6'
+mock==1.0.1;python_version=='2.6'
 coverage>=3.6
 # this is required for the docs build jobs
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2