diff --git a/neutron_vpnaas_dashboard/dashboards/project/vpn/workflows.py b/neutron_vpnaas_dashboard/dashboards/project/vpn/workflows.py
index 36cf298..c898ecc 100644
--- a/neutron_vpnaas_dashboard/dashboards/project/vpn/workflows.py
+++ b/neutron_vpnaas_dashboard/dashboards/project/vpn/workflows.py
@@ -153,7 +153,7 @@ class AddEndpointGroupAction(workflows.Action):
             'class': 'switched',
             'data-switch-on': 'type',
             'data-type-subnet': _("External System Subnets"),
-            }),
+        }),
         help_text=_("Local subnet(s). "
                     "This field is valid if type is Subnet"),)
 
diff --git a/test-requirements.txt b/test-requirements.txt
index bcdedd6..e55e4bc 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 # Hacking should appear first in case something else depends on pep8
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+hacking>=1.1.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 flake8-import-order==0.13 # LGPLv3
diff --git a/tox.ini b/tox.ini
index b76dcc6..969085a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -64,7 +64,13 @@ exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,node_modules,.tmp
 # Enable the following hacking rules which are disabled by default
 # H203 Use assertIs(Not)None to check for None
 # H904 Delay string interpolations at logging calls
-enable-extensions=H203,H904
+enable-extensions = H203,H904
+# W504 line break after binary operator
+# (W503 and W504 are incompatible and we need to choose one of them.
+#  Existing codes follows W503, so we disable W504.)
+# F405 TEMPLATES may be undefined, or defined from star imports
+# (because it is not easy to avoid this in openstack_dashboard.test.settings)
+ignore = W504,F405
 max-complexity = 20
 
 # flake8-import-order configurations