diff --git a/tox.ini b/tox.ini
index 4ace62d..85358ec 100644
--- a/tox.ini
+++ b/tox.ini
@@ -82,7 +82,7 @@ commands = python setup.py testr --slowest --coverage --testr-args="{posargs}"
 commands = python setup.py build_sphinx
 
 [testenv:pep8]
-deps = hacking<0.11,>=0.10.0
+deps = hacking<0.13,>=0.12
       doc8
 commands =
     flake8
@@ -92,10 +92,6 @@ commands =
 exclude=.venv,.git,.tox,dist,*egg,*.egg-info,build,examples,doc
 show-source = True
 
-[hacking]
-import_exceptions = six.moves
-    unittest.mock
-
 [doc8]
 
 ignore-path = doc/source/compatibility.rst,doc/source/history.rst