diff --git a/test-requirements.txt b/test-requirements.txt
index 7b7ba6ac..db7c23c6 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hacking>=0.11.0,<0.12 # Apache-2.0
+hacking>=0.12.0,!=0.13.0,<0.14  # Apache-2.0
 sphinx
 nose
 openstack.nose_plugin
diff --git a/tox.ini b/tox.ini
index c9f8f751..93ca8681 100644
--- a/tox.ini
+++ b/tox.ini
@@ -104,6 +104,9 @@ setenv = VIRTUAL_ENV={envdir}
 ignore = F812,H101,H202,H233,H237,H301,H306,H401,H403,H404,H405,H501
 exclude = .venv,.git,.tox,dist,doc,*egg,build,scratch
 show-source = True
+# Add in some optional checks:
+# H203: Use assertIs(Not)None to check for None
+enable-extensions = H203
 
 
 [testenv:bindep]