diff --git a/releasenotes/notes/drop-python36-834bb59e53d5fd71.yaml b/releasenotes/notes/drop-python36-834bb59e53d5fd71.yaml
new file mode 100644
index 0000000..5fb5e1c
--- /dev/null
+++ b/releasenotes/notes/drop-python36-834bb59e53d5fd71.yaml
@@ -0,0 +1,8 @@
+---
+upgrade:
+  - |
+    Support for Python 3.5 through 3.7 has been dropped. The minimum
+    supported Python version is now 3.8.
+  - |
+    ``hacking`` is now compatible with ``flake8~=4.0.1``. flake8 3.x
+    is no longer supported.
diff --git a/setup.cfg b/setup.cfg
index 5885e44..e7b155a 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 = >=3.6
+python_requires = >=3.8
 project_urls =
   Bug Tracker = https://bugs.launchpad.net/hacking
   Reviews = https://review.opendev.org/q/p:openstack/hacking+status:open
@@ -22,8 +22,6 @@ classifier =
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9