diff --git a/tox.ini b/tox.ini
index 086fccb..96d19de 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-minversion = 1.6
+minversion = 1.8
 envlist = py33,py34,py27,pypy,pep8
 skipsdist = True
 
@@ -13,7 +13,7 @@ deps = -r{toxinidir}/requirements.txt
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
-deps = hacking<0.11,>=0.10.0
+deps = hacking>=0.11,<0.12
 commands = flake8
 
 [testenv:venv]
@@ -29,9 +29,5 @@ commands = python setup.py build_sphinx
 commands = oslo_debug_helper {posargs}
 
 [flake8]
-# H803 skipped on purpose per list discussion.
-# E123, E125 skipped as they are invalid PEP-8.
-
 show-source = True
-ignore = E123,E125,H803
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build