diff --git a/src/pretix/helpers/i18n.py b/src/pretix/helpers/i18n.py
index bdcd89c741..27a74175c3 100644
--- a/src/pretix/helpers/i18n.py
+++ b/src/pretix/helpers/i18n.py
@@ -86,8 +86,8 @@ moment_locales = {
     'te', 'tzm', 'zh-cn',
 }
 
-toJavascript_re = re.compile(r'(?<!\w)(' + '|'.join(date_conversion_to_moment.keys()) + r')\b')
-toJavascriptOut_re = re.compile(r'(?<!\w)(' + '|'.join(out_date_conversion_to_moment.keys()) + r')\b')
+toJavascript_re = re.compile(r'(?<!\w)(' + '|'.join(date_conversion_to_moment.keys()) + r')\b')  # noqa
+toJavascriptOut_re = re.compile(r'(?<!\w)(' + '|'.join(out_date_conversion_to_moment.keys()) + r')\b')  # noqa
 
 
 def get_javascript_output_format(format_name):
diff --git a/src/pretix/plugins/reports/exporters.py b/src/pretix/plugins/reports/exporters.py
index 874c29f776..b24a1e2367 100644
--- a/src/pretix/plugins/reports/exporters.py
+++ b/src/pretix/plugins/reports/exporters.py
@@ -22,7 +22,7 @@ from pretix.base.services.stats import order_overview
 
 
 class ReportlabExportMixin:
-    multiBuild = False
+    multiBuild = False  # noqa
 
     @property
     def pagesize(self):
diff --git a/src/requirements/dev.txt b/src/requirements/dev.txt
index d34548b411..8019455530 100644
--- a/src/requirements/dev.txt
+++ b/src/requirements/dev.txt
@@ -1,10 +1,10 @@
 django-debug-toolbar==1.9.1
 sqlparse==0.2.1  # pinned due to difficulties with django-debug-toolbar
 # Testing requirements
-pycodestyle >= 2.4.0, < 2.5.0 # requirement by flake8 3.6.0
-pyflakes >= 2.0.0, < 2.1.0 # requirement by flake8 3.6.0
+pycodestyle==2.5.*
+pyflakes==2.1.*
 pep8-naming
-flake8
+flake8==3.7.*
 codecov
 coverage
 pytest==3.6.*
diff --git a/src/setup.cfg b/src/setup.cfg
index dcdc749f22..5873633d91 100644
--- a/src/setup.cfg
+++ b/src/setup.cfg
@@ -1,5 +1,5 @@
 [flake8]
-ignore = N802,W503,E402,C901,E722,W504,E252,N812
+ignore = N802,W503,E402,C901,E722,W504,E252,N812,N806
 max-line-length = 160
 exclude = migrations,.ropeproject,static,mt940.py,_static,build,make_testdata.py,*/testutils/settings.py,tests/settings.py,pretix/base/models/__init__.py
 max-complexity = 11