diff --git a/lower-constraints.txt b/lower-constraints.txt
index 77a10d33..4b4b5e4b 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -1,7 +1,7 @@
 alabaster==0.7.10
 alembic==0.8.10
 amqp==2.1.1
-appdirs==1.3.0
+appdirs==1.4.3
 astroid==1.6.5
 Babel==2.3.4
 bandit==1.1.0
diff --git a/tox.ini b/tox.ini
index 752e7312..6632e0f0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,6 +56,7 @@ commands = oslo_debug_helper {posargs}
 
 [flake8]
 show-source = True
+# E113: unexpected whitespace; skipped in os-ken because C-style comment blocks are used pervasively
 # E123, E125 skipped as they are invalid PEP-8.
 # Temporarily ignoring these warnings
 # W503: line break before binary operator
@@ -85,7 +86,7 @@ show-source = True
 # H404: Multi line docstrings should start without a leading new line.
 # H405: Multi line docstrings should start with a one line summary followed by an empty line.
 # H501: Do not use ``locals()`` or ``self.__dict__`` for formatting strings
-ignore = E123,E125,W503,E116,E128,E402,E501,E704,E722,E731,E741,F401,F403,F811,F812,F821,F841,H101,H102,H104,H105,H201,H301,H306,H401,H403,H404,H405,H501
+ignore = E113,E123,E125,W503,E116,E128,E402,E501,E704,E722,E731,E741,F401,F403,F811,F812,F821,F841,H101,H102,H104,H105,H201,H301,H306,H401,H403,H404,H405,H501
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools,os_ken/contrib