diff --git a/hacking/checks/python23.py b/hacking/checks/python23.py
index d44d2579..b1233187 100644
--- a/hacking/checks/python23.py
+++ b/hacking/checks/python23.py
@@ -158,8 +158,11 @@ def hacking_python3x_metaclass(logical_line, noqa):
     if noqa:
         return
     split_line = logical_line.split()
-    if(len(split_line) > 2 and split_line[0] == '__metaclass__' and
-       split_line[1] == '='):
+    if (
+        len(split_line) > 2
+        and split_line[0] == '__metaclass__'
+        and split_line[1] == '='
+    ):
         yield (logical_line.find('__metaclass__'),
                "H236: Python 3.x incompatible __metaclass__, "
                "use six.add_metaclass()")
diff --git a/hacking/tests/test_doctest.py b/hacking/tests/test_doctest.py
index 70f44acb..fbc8c3be 100644
--- a/hacking/tests/test_doctest.py
+++ b/hacking/tests/test_doctest.py
@@ -40,7 +40,8 @@ class HackingTestCase(hacking.tests.TestCase):
             f.write(''.join(self.lines))
 
         cmd = [sys.executable, '-mflake8', '--isolated',
-               '--select=%s' % self.code, '--ignore=F',
+               '--select=%s' % self.code,
+               '--enable-extensions=%s' % self.code, '--ignore=F',
                '--format=%(code)s\t%(path)s\t%(row)d', f.name]
         out, _ = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
 
@@ -52,6 +53,7 @@ class HackingTestCase(hacking.tests.TestCase):
             self.addDetail('reason',
                            content.text_content("Failed to trigger rule %s" %
                                                 self.code))
+
             self.assertNotEqual('', out)
             self.assertEqual(self.code, out.split('\t')[0].rstrip(':'), out)
 
diff --git a/requirements.txt b/requirements.txt
index 0c5f0f97..6f081d02 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-flake8~=4.0.1 # MIT
+flake8~=5.0.1 # MIT