diff --git a/test-requirements.txt b/test-requirements.txt
index d6e73bd..35e4e57 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-hacking>=1.0.0 # Apache-2.0
+hacking>=1.0.0,<1.1.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
 coverage!=4.4,>=4.0 # Apache-2.0