diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 85377ed..2399c1d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -28,3 +28,8 @@ repos:
     hooks:
       - id: bandit
         args: ['-x', 'tests']
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v3.18.0
+    hooks:
+      - id: pyupgrade
+        args: [--py3-only]
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 828b915..06a7769 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Copyright (C) 2020 Red Hat, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/oslo_limit/exception.py b/oslo_limit/exception.py
index 3f1d0ec..0bd8486 100644
--- a/oslo_limit/exception.py
+++ b/oslo_limit/exception.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
 # a copy of the License at
@@ -35,10 +33,10 @@ class ProjectOverLimit(Exception):
         msg = _("Project %(project_id)s is over a limit for "
                 "%(limits)s") % {'project_id': project_id,
                                  'limits': over_limit_info_list}
-        super(ProjectOverLimit, self).__init__(msg)
+        super().__init__(msg)
 
 
-class OverLimitInfo(object):
+class OverLimitInfo:
     def __init__(self, resource_name, limit, current_usage, delta):
         self.resource_name = resource_name
         self.limit = int(limit)
@@ -60,4 +58,4 @@ class SessionInitError(Exception):
         msg = _(
             "Can't initialise OpenStackSDK session: %(reason)s."
         ) % {'reason': reason}
-        super(SessionInitError, self).__init__(msg)
+        super().__init__(msg)
diff --git a/oslo_limit/fixture.py b/oslo_limit/fixture.py
index dfea2cb..38aad0c 100644
--- a/oslo_limit/fixture.py
+++ b/oslo_limit/fixture.py
@@ -37,7 +37,7 @@ class LimitFixture(fixtures.Fixture):
         self.projlimits = projlimits
 
     def setUp(self):
-        super(LimitFixture, self).setUp()
+        super().setUp()
 
         # We mock our own cached connection to Keystone
         self.mock_conn = mock.MagicMock()
diff --git a/oslo_limit/limit.py b/oslo_limit/limit.py
index ef53fbc..552f3ec 100644
--- a/oslo_limit/limit.py
+++ b/oslo_limit/limit.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
 # a copy of the License at
@@ -54,7 +52,7 @@ def _get_keystone_connection():
     return _SDK_CONNECTION
 
 
-class Enforcer(object):
+class Enforcer:
 
     def __init__(self, usage_callback, cache=True):
         """An object for checking usage against resource limits and requests.
@@ -189,7 +187,7 @@ class Enforcer(object):
                                              resources_to_check)
 
 
-class _FlatEnforcer(object):
+class _FlatEnforcer:
 
     name = 'flat'
 
@@ -220,7 +218,7 @@ class _FlatEnforcer(object):
                                    current_usage, deltas)
 
 
-class _StrictTwoLevelEnforcer(object):
+class _StrictTwoLevelEnforcer:
 
     name = 'strict-two-level'
 
@@ -245,13 +243,13 @@ _MODELS = [_FlatEnforcer, _StrictTwoLevelEnforcer]
 
 class _LimitNotFound(Exception):
     def __init__(self, resource):
-        msg = "Can't find the limit for resource %(resource)s" % {
-            'resource': resource}
+        msg = "Can't find the limit for resource {resource}".format(
+            resource=resource)
         self.resource = resource
-        super(_LimitNotFound, self).__init__(msg)
+        super().__init__(msg)
 
 
-class _EnforcerUtils(object):
+class _EnforcerUtils:
     """Logic common used by multiple enforcers"""
 
     def __init__(self, cache=True):
diff --git a/oslo_limit/tests/test_fixture.py b/oslo_limit/tests/test_fixture.py
index 61fde1b..95b5c1f 100644
--- a/oslo_limit/tests/test_fixture.py
+++ b/oslo_limit/tests/test_fixture.py
@@ -26,7 +26,7 @@ CONF = cfg.CONF
 
 class TestFixture(base.BaseTestCase):
     def setUp(self):
-        super(TestFixture, self).setUp()
+        super().setUp()
 
         self.config_fixture = self.useFixture(config_fixture.Config(CONF))
         self.config_fixture.config(
diff --git a/oslo_limit/tests/test_limit.py b/oslo_limit/tests/test_limit.py
index 7a300bb..e1ae3ab 100644
--- a/oslo_limit/tests/test_limit.py
+++ b/oslo_limit/tests/test_limit.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
 # a copy of the License at
@@ -39,7 +37,7 @@ CONF = cfg.CONF
 class TestEnforcer(base.BaseTestCase):
 
     def setUp(self):
-        super(TestEnforcer, self).setUp()
+        super().setUp()
         self.deltas = dict()
         self.config_fixture = self.useFixture(config_fixture.Config(CONF))
         self.config_fixture.config(
@@ -226,7 +224,7 @@ class TestEnforcer(base.BaseTestCase):
 
 class TestFlatEnforcer(base.BaseTestCase):
     def setUp(self):
-        super(TestFlatEnforcer, self).setUp()
+        super().setUp()
         self.config_fixture = self.useFixture(config_fixture.Config(CONF))
         self.config_fixture.config(
             group='oslo_limit',
@@ -319,7 +317,7 @@ class TestFlatEnforcer(base.BaseTestCase):
 
 class TestEnforcerUtils(base.BaseTestCase):
     def setUp(self):
-        super(TestEnforcerUtils, self).setUp()
+        super().setUp()
         self.config_fixture = self.useFixture(config_fixture.Config(CONF))
         self.config_fixture.config(
             group='oslo_limit',
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 61d652b..b0dd26a 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Copyright (C) 2020 Red Hat, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");