diff --git a/test-requirements.txt b/test-requirements.txt
index 2185997..693daff 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,6 @@
 pep8==1.4.5
 pyflakes==0.7.2
 flake8==2.0
-hacking>=0.5.3,<0.6
+hacking>=0.5.6,<0.7
 # needed for doc build
 sphinx>=1.1.2
-