diff --git a/lower-constraints.txt b/lower-constraints.txt
index ecdd65e1..03572e1c 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -25,11 +25,9 @@ eventlet==0.18.2
 extras==1.0.0
 fasteners==0.7.0
 fixtures==3.0.0
-flake8==2.5.5
 funcsigs==1.0.0
 futurist==1.2.0
 greenlet==0.4.10
-hacking==0.12.0
 horizon==17.1.0
 idna==2.6
 imagesize==0.7.1
@@ -72,14 +70,12 @@ osprofiler==1.4.0
 Paste==2.0.2
 PasteDeploy==1.5.0
 pbr==2.0.0
-pep8==1.5.7
 pika-pool==0.1.3
 pika==0.10.0
 Pint==0.5
 positional==1.2.1
 prettytable==0.7.2
 pycparser==2.18
-pyflakes==0.8.1
 Pygments==2.2.0
 pyinotify==0.9.6
 pymongo==3.0.2
diff --git a/monitoring/alarms/forms.py b/monitoring/alarms/forms.py
index 0ea14939..9424b780 100644
--- a/monitoring/alarms/forms.py
+++ b/monitoring/alarms/forms.py
@@ -65,7 +65,7 @@ class SimpleExpressionWidget(django_forms.MultiWidget):
 
     def decompress(self, expr):
         if expr:
-            return re.search('^(\w+)\((.*)\) ([<>=]*) (.*)$', expr).groups()
+            return re.search(r'^(\w+)\((.*)\) ([<>=]*) (.*)$', expr).groups()
         else:
             return [None, None, None, None]
 
diff --git a/monitoring/dashboard.py b/monitoring/dashboard.py
index 99523b05..e941d5df 100644
--- a/monitoring/dashboard.py
+++ b/monitoring/dashboard.py
@@ -26,4 +26,5 @@ class Monitoring(horizon.Dashboard):
     policy_rules = (("monitoring", "monitoring:monitoring"),)
     permissions = (('openstack.services.' + settings.MONITORING_SERVICE_TYPE),)
 
+
 horizon.register(Monitoring)
diff --git a/monitoring/notifications/constants.py b/monitoring/notifications/constants.py
index e21ee06e..4ac463c6 100644
--- a/monitoring/notifications/constants.py
+++ b/monitoring/notifications/constants.py
@@ -21,6 +21,7 @@ class NotificationType(object):
     WEBHOOK = "WEBHOOK"
     PAGERDUTY = "PAGERDUTY"
 
+
 EMAIL_VALIDATOR = validators.EmailValidator(
     message=_("Address must contain a valid email address."))
 WEBHOOK_VALIDATOR = validators.URLValidator(
diff --git a/test-requirements.txt b/test-requirements.txt
index 2ffd7959..03af7ac4 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 # Hacking already pins down pep8, pyflakes and flake8
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
diff --git a/tools/install_venv.py b/tools/install_venv.py
index 547a4470..6675cc8c 100644
--- a/tools/install_venv.py
+++ b/tools/install_venv.py
@@ -22,6 +22,8 @@
 Installation script for the OpenStack Dashboard development virtualenv.
 """
 
+# flake8: noqa
+
 from __future__ import print_function
 
 import os
diff --git a/tox.ini b/tox.ini
index d6a5a7f6..044c83de 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,7 +37,9 @@ commands = /bin/bash run_tests.sh -N --coverage {posargs}
 [flake8]
 # F405 TEMPLATES may be undefined, or defined from star imports
 # (because it is not easy to avoid this in openstack_dashboard.test.settings)
-ignore = F405
+# W504 line break after binary operator
+# (we use W503 instead)
+ignore = F405,W504
 max-line-length = 100
 builtins = _
 exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,panel_template,dash_template,local_settings.py,*/local/*,*/test/test_plugins/*