diff --git a/.zuul.yaml b/.zuul.yaml
index 9e7b191..5e09d41 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -2,7 +2,6 @@
     templates:
       - publish-openstack-docs-pti
       - openstack-cover-jobs
-      - openstack-python35-jobs
       - openstack-python3-jobs
       - release-notes-jobs-python3
     check:
diff --git a/requirements.txt b/requirements.txt
index 8367022..0c5f0f9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-flake8<3.9.0,>=3.8.0 # MIT
+flake8~=4.0.1 # MIT
diff --git a/setup.cfg b/setup.cfg
index 6c1cbf7..5885e44 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,7 +6,7 @@ summary = OpenStack Hacking Guideline Enforcement
 description_file =
     README.rst
 home_page = https://docs.openstack.org/hacking/latest/
-python_requires = >=3.5
+python_requires = >=3.6
 project_urls =
   Bug Tracker = https://bugs.launchpad.net/hacking
   Reviews = https://review.opendev.org/q/p:openstack/hacking+status:open
@@ -22,7 +22,6 @@ classifier =
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8