diff --git a/.travis.yml b/.travis.yml
index 4c39d04..f41ca1c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+dist: focal
 language: python
 matrix:
   include:
@@ -8,13 +9,7 @@ matrix:
     env: TOX_ENV=check_rst
   - python: "3.9"
     env: TOX_ENV=coverage
-  # Debian strech support
-  - python: "3.5"
-    env: TOX_ENV=py35-django111
-  - python: "3.5"
-    env: TOX_ENV=py35-django111
-    arch: ppc64le
-  # Ubuntu bionic and EPEL 7 support
+  # REHL 7 support and Ubuntu bionic
   - python: "3.6"
     env: TOX_ENV=py36-django111
   - python: "3.6"
@@ -38,17 +33,25 @@ matrix:
   - python: "3.8"
     env: TOX_ENV=py38-django22
     arch: ppc64le
-  # Debian bullseye and Ubuntu hirsute support
+  # Debian bullseye and Ubuntu hirsute and impish support
   - python: "3.9"
     env: TOX_ENV=py39-django22
   - python: "3.9"
     env: TOX_ENV=py39-django22
     arch: ppc64le
+  # Ubuntu jammy and kinetic support
+  - python: "3.10"
+    env: TOX_ENV=py310-django32
+  - python: "3.10"
+    env: TOX_ENV=py310-django32
+    arch: ppc64le
   # Django additional supported version
-  - python: "3.9"
-    env: TOX_ENV=py39-django31
   - python: "3.9"
     env: TOX_ENV=py39-django32
+  - python: "3.10"
+    env: TOX_ENV=py310-django40
+  - python: "3.10"
+    env: TOX_ENV=py310-django41
 
 cache:
   directories:
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f2a8071..a8ea1ce 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,34 @@ All notable changes to this project will be documented in this file.
 .. contents:: Table of Contents
    :depth: 2
 
+v2.0.0 - 2022-10-17
+===================
+
+Added
+-----
+* Support for Django 4.0 and 4.1
+* Add locale for zh_Hans
+* Add a unit test with a non ascii char in service url
+* Add settings to allow deletings Django cookies upon logout
+
+Changed
+-------
+* Update CI: require pytest >= 7 and remove pytest-pythonpath dependancy
+
+Fixes
+-----
+* Fix unicode sandwich issue in cas_server.utils.update_url
+* Fix DeprecationWarning about default_app_config in Django 3.2
+* Fix DeprecationWarning about USE_L10N in Django 4.0
+
+Removed
+-------
+* Drop support for python 2.7 (now deprecated for more than 2 years,
+  expect it to break now or in a near future)
+* Drop support for python 3.5 (but it should keep working for a while.
+  pytest >= 7 do not support python 3.5 and Debian Stretch support ended)
+
+
 v1.3.1 - 2021-07-03
 ===================
 
diff --git a/README.rst b/README.rst
index 50bc8c7..69d8fc1 100644
--- a/README.rst
+++ b/README.rst
@@ -21,15 +21,15 @@ Features
 * Possibility to rename/rewrite attributes per service
 * Possibility to require some attribute values per service
 * Federated mode between multiple CAS
-* Supports Django 1.11, 2.2, 3.1 and 3.2
-* Supports Python 3.5+
+* Supports Django 1.11, 2.2, 3.2, 4.0 and 4.1
+* Supports Python 3.6+
 
 Dependencies
 ============
 
 ``django-cas-server`` depends on the following python packages:
 
-* Django >= 1.11 < 3.3
+* Django >= 1.11 < 4.2
 * requests >= 2.4
 * requests_futures >= 0.9.5
 * lxml >= 3.4
@@ -285,6 +285,17 @@ Authentication settings
   
 * ``CAS_SLO_TIMEOUT``: Timeout for a single SLO request in seconds. The default is ``5``.
 
+* ``CAS_REMOVE_DJANGO_SESSION_COOKIE_ON_LOGOUT``: If `True` Django session cookie will be removed
+  on logout from CAS server (default `False`). Note that Django session middleware will generate
+  a new session cookie.
+
+* ``CAS_REMOVE_DJANGO_CSRF_COOKIE_ON_LOGOUT``: If `True` Django csrf cookie will be removed on
+  logout from CAS server (default `False`). Note that Django csrf middleware will generate a new
+  csrf token cookie.
+
+* ``CAS_REMOVE_DJANGO_LANGUAGE_COOKIE_ON_LOGOUT``: If `True` Django language cookie will be
+  removed on logout from CAS server (default `False`).
+
 
 Federation settings
 -------------------
diff --git a/cas_server/__init__.py b/cas_server/__init__.py
index 2ac3122..72c98ae 100644
--- a/cas_server/__init__.py
+++ b/cas_server/__init__.py
@@ -9,9 +9,14 @@
 #
 # (c) 2015-2016 Valentin Samir
 """A django CAS server application"""
+try:
+    import django
+except ModuleNotFoundError:
+    django = None
 
 #: version of the application
-VERSION = '1.3.1'
+VERSION = '2.0.0'
 
-#: path the the application configuration class
-default_app_config = 'cas_server.apps.CasAppConfig'
+if django is None or django.VERSION < (3, 2):
+    #: path the the application configuration class
+    default_app_config = 'cas_server.apps.CasAppConfig'
diff --git a/cas_server/default_settings.py b/cas_server/default_settings.py
index cbdb7f8..408e146 100644
--- a/cas_server/default_settings.py
+++ b/cas_server/default_settings.py
@@ -239,6 +239,13 @@
 #: Let the list empty to disable messages display.
 CAS_INFO_MESSAGES_ORDER = []
 
+#: :class:`bool` If `True` Django session cookie will be removed on logout from CAS server
+CAS_REMOVE_DJANGO_SESSION_COOKIE_ON_LOGOUT = False
+#: :class:`bool` If `True` Django csrf cookie will be removed on logout from CAS server
+CAS_REMOVE_DJANGO_CSRF_COOKIE_ON_LOGOUT = False
+#: :class:`bool` If `True` Django language cookie will be removed on logout from CAS server
+CAS_REMOVE_DJANGO_LANGUAGE_COOKIE_ON_LOGOUT = False
+
 
 GLOBALS = globals().copy()
 for name, default_value in GLOBALS.items():
diff --git a/cas_server/locale/zh_Hans/LC_MESSAGES/django.mo b/cas_server/locale/zh_Hans/LC_MESSAGES/django.mo
new file mode 100644
index 0000000..7c166c4
Binary files /dev/null and b/cas_server/locale/zh_Hans/LC_MESSAGES/django.mo differ
diff --git a/cas_server/locale/zh_Hans/LC_MESSAGES/django.po b/cas_server/locale/zh_Hans/LC_MESSAGES/django.po
new file mode 100644
index 0000000..1f2c9c4
--- /dev/null
+++ b/cas_server/locale/zh_Hans/LC_MESSAGES/django.po
@@ -0,0 +1,421 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2021-08-01 22:18+0800\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=1; plural=0;\n"
+
+#: apps.py:30 templates/cas_server/bs3/base.html:7
+#: templates/cas_server/bs3/base.html:26 templates/cas_server/bs4/base.html:6
+#: templates/cas_server/bs4/base.html:17
+msgid "Central Authentication Service"
+msgstr "认证中心服务"
+
+#: default_settings.py:230
+msgid ""
+"The Central Authentication Service grants you access to most of our websites "
+"by authenticating only once, so you don't need to type your credentials "
+"again unless your session expires or you logout."
+msgstr ""
+"您仅需在认证中心认证一次，就可以访问您的多数网站, "
+"这样您不再需要重复输入认证，除非您的会话过期，或者您登出了."
+
+#: forms.py:93
+msgid "Identity provider"
+msgstr "身份提供者"
+
+#: forms.py:97 forms.py:119
+msgid "Warn me before logging me into other sites."
+msgstr "登录到其它网站时警告我"
+
+#: forms.py:101
+msgid "Remember the identity provider"
+msgstr "记住此身份提供者"
+
+#: forms.py:112 models.py:646
+msgid "username"
+msgstr "用户名"
+
+#: forms.py:116
+msgid "password"
+msgstr "密码"
+
+#: forms.py:139
+msgid "The credentials you provided cannot be determined to be authentic."
+msgstr "您提供的令牌不能通过鉴权"
+
+#: forms.py:191
+msgid "User not found in the temporary database, please try to reconnect"
+msgstr "在临时数据库找不到此用户，请尝试重新连接"
+
+#: forms.py:205
+msgid "service"
+msgstr "服务"
+
+#: management/commands/cas_clean_federate.py:25
+msgid "Clean old federated users"
+msgstr "清除过期联盟用户"
+
+#: management/commands/cas_clean_sessions.py:27
+msgid "Clean deleted sessions"
+msgstr "清除被删除的会话"
+
+#: management/commands/cas_clean_tickets.py:27
+msgid "Clean old tickets"
+msgstr "清除过期凭证"
+
+#: models.py:79
+msgid "identity provider"
+msgstr "身份提供者"
+
+#: models.py:80
+msgid "identity providers"
+msgstr "身份证供者"
+
+#: models.py:86
+msgid "suffix"
+msgstr "后缀"
+
+#: models.py:88
+msgid ""
+"Suffix append to backend CAS returned username: ``returned_username`` @ "
+"``suffix``."
+msgstr "后端 CAS 附加后缀返回的用户名: ``returned_username`` @ "
+"``suffix``."
+
+#: models.py:95
+msgid "server url"
+msgstr "服务 url"
+
+#: models.py:105
+msgid "CAS protocol version"
+msgstr "CAS 协议版本"
+
+#: models.py:107
+msgid ""
+"Version of the CAS protocol to use when sending requests the the backend CAS."
+msgstr ""
+"后端 CAS 发送请求时使用的 CAS 协议版本"
+
+#: models.py:114
+msgid "verbose name"
+msgstr "详细名称"
+
+#: models.py:115
+msgid "Name for this identity provider displayed on the login page."
+msgstr "在登录页显示的身份提供者的名字"
+
+#: models.py:121 models.py:498
+msgid "position"
+msgstr "位置"
+
+#: models.py:135
+msgid "display"
+msgstr "显示"
+
+#: models.py:136
+msgid "Display the provider on the login page."
+msgstr "在登录页显示提供者"
+
+#: models.py:174
+msgid "Federated user"
+msgstr "联盟用户"
+
+#: models.py:175
+msgid "Federated users"
+msgstr "联盟用户"
+
+#: models.py:254
+msgid "User attributes cache"
+msgstr "用户属性缓存"
+
+#: models.py:255
+msgid "User attributes caches"
+msgstr "用户属性缓存"
+
+#: models.py:279
+msgid "User"
+msgstr "用户"
+
+#: models.py:280
+msgid "Users"
+msgstr "用户"
+
+#: models.py:372
+#, python-format
+msgid "Error during service logout %s"
+msgstr "服务登出中的异常 %s"
+
+#: models.py:492
+msgid "Service pattern"
+msgstr "服务范式"
+
+#: models.py:493
+msgid "Services patterns"
+msgstr "服务范式"
+
+#: models.py:499
+msgid "service patterns are sorted using the position attribute"
+msgstr "服务范式会按照位置属性排序"
+
+#: models.py:507 models.py:676
+msgid "name"
+msgstr "名称"
+
+#: models.py:508
+msgid "A name for the service"
+msgstr "服务的名称"
+
+#: models.py:516 models.py:723 models.py:757
+msgid "pattern"
+msgstr "范式"
+
+#: models.py:518
+msgid ""
+"A regular expression matching services. Will usually looks like '^https://"
+"some\\.server\\.com/path/.*$'.As it is a regular expression, special "
+"character must be escaped with a '\\'."
+msgstr ""
+"用一个正则表示式来匹配服务。一般如 '^https://"
+"some\\.server\\.com/path/.*$'. 在正则表达式中，特殊"
+"字符必须用 '\\' 转码."
+
+#: models.py:529
+msgid "user field"
+msgstr "用户字段"
+
+#: models.py:530
+msgid "Name of the attribute to transmit as username, empty = login"
+msgstr "被转译作为用户名的属性字段，空 = login"
+
+#: models.py:535
+msgid "restrict username"
+msgstr "用户名限制"
+
+#: models.py:536
+msgid "Limit username allowed to connect to the list provided bellow"
+msgstr "只允许下面列表提供的用户名连接"
+
+#: models.py:541
+msgid "proxy"
+msgstr "代理"
+
+#: models.py:542
+msgid "Proxy tickets can be delivered to the service"
+msgstr "可以对服务分发的代理凭证"
+
+#: models.py:548
+msgid "proxy callback"
+msgstr "代理回调"
+
+#: models.py:549
+msgid "can be used as a proxy callback to deliver PGT"
+msgstr "可以作为代理回调来分发PGT"
+
+#: models.py:556
+msgid "single log out"
+msgstr "单点登出"
+
+#: models.py:557
+msgid "Enable SLO for the service"
+msgstr "为服务启用 SLO"
+
+#: models.py:565
+msgid "single log out callback"
+msgstr "单点登出回调"
+
+#: models.py:566
+msgid ""
+"URL where the SLO request will be POST. empty = service url\n"
+"This is usefull for non HTTP proxied services."
+msgstr ""
+"SLO 的 POST 请求使用的 URL. 空 = 服务地址\n"
+"在为非 HTTP 代理服务时有用"
+
+#: models.py:647
+msgid "username allowed to connect to the service"
+msgstr "允许连接到服务的用户名"
+
+#: models.py:677
+msgid "name of an attribute to send to the service, use * for all attributes"
+msgstr "发给服务的属性名, 使用 * 表示所有属性"
+
+#: models.py:684 models.py:765
+msgid "replace"
+msgstr "替换"
+
+#: models.py:685
+msgid ""
+"name under which the attribute will be show to the service. empty = default "
+"name of the attribut"
+msgstr ""
+"展示给服务的属性的名字. 空 = default"
+"属性的名字"
+
+#: models.py:716 models.py:751
+msgid "attribute"
+msgstr "属性"
+
+#: models.py:717
+msgid "Name of the attribute which must verify pattern"
+msgstr "必须校验范式的属性的名字"
+
+#: models.py:724
+msgid "a regular expression"
+msgstr "一个正则表达式"
+
+#: models.py:752
+msgid "Name of the attribute for which the value must be replace"
+msgstr "必须被替换的值的属性的名字"
+
+#: models.py:758
+msgid "An regular expression maching whats need to be replaced"
+msgstr "一个正则表达式，符合的将要被替换"
+
+#: models.py:766
+msgid "replace expression, groups are capture by \\1, \\2 …"
+msgstr "替换表达式, 用 \\`, \\2 等等来替换组"
+
+#: templates/cas_server/bs3/base.html:43 templates/cas_server/bs4/base.html:28
+#, python-format
+msgid ""
+"A new version of the application is available. This instance runs "
+"%(VERSION)s and the last version is %(LAST_VERSION)s. Please consider "
+"upgrading."
+msgstr ""
+"此应用有一个新版本可用. 此实例运行于 %(VERSION)s, 最新的版本是 %(LAST_VERSION)s. 请考虑升级"
+
+#: templates/cas_server/bs3/logged.html:4
+#: templates/cas_server/bs4/logged.html:4
+msgid ""
+"<h3>Log In Successful</h3>You have successfully logged into the Central "
+"Authentication Service.<br/>For security reasons, please Log Out and Exit "
+"your web browser when you are done accessing services that require "
+"authentication!"
+msgstr ""
+"<h3>登入成功</h3>您已经成功登入认证中心."
+"<br/>出于安全考虑, 当您用完需要认证的服务时，请您登出并退出您的浏览器!"
+
+#: templates/cas_server/bs3/logged.html:8
+#: templates/cas_server/bs4/logged.html:8
+msgid "Log me out from all my sessions"
+msgstr "从我的所有会话中登出"
+
+#: templates/cas_server/bs3/logged.html:14
+#: templates/cas_server/bs4/logged.html:14
+msgid "Forget the identity provider"
+msgstr "忘掉身份提供者"
+
+#: templates/cas_server/bs3/logged.html:18
+#: templates/cas_server/bs4/logged.html:18
+msgid "Logout"
+msgstr "登出"
+
+#: templates/cas_server/bs3/login.html:6 templates/cas_server/bs4/login.html:7
+msgid "Please log in"
+msgstr "请登录"
+
+#: templates/cas_server/bs3/login.html:14
+#: templates/cas_server/bs4/login.html:17
+msgid "Login"
+msgstr "登录"
+
+#: templates/cas_server/bs3/warn.html:9 templates/cas_server/bs4/warn.html:9
+msgid "Connect to the service"
+msgstr "连接到服务"
+
+#: utils.py:753
+#, python-format
+msgid "\"%(value)s\" is not a valid regular expression"
+msgstr "\"%(value)s\" 不是一个有效的正则表达式"
+
+#: views.py:197
+msgid ""
+"<h3>Logout successful</h3>You have successfully logged out from the Central "
+"Authentication Service. For security reasons, close your web browser."
+msgstr ""
+"<h3>登出成功</h3>您成功从认证中心登出."
+"安全起见，请关闭您的浏览器"
+
+
+#: views.py:203
+#, python-format
+msgid ""
+"<h3>Logout successful</h3>You have successfully logged out from %d sessions "
+"of the Central Authentication Service. For security reasons, close your web "
+"browser."
+msgstr ""
+"<h3>登出成功</h3>您已经从认证中心服务的会话 %d 中成功登出"
+"为安全起见，请关闭您的浏览器"
+
+#: views.py:210
+msgid ""
+"<h3>Logout successful</h3>You were already logged out from the Central "
+"Authentication Service. For security reasons, close your web browser."
+msgstr ""
+"<h3>登出成功</h3>您已经从认证中心服务登出. "
+"为安全起见，请关闭您的浏览器"
+
+#: views.py:391
+#, python-format
+msgid ""
+"Invalid response from your identity provider CAS upon ticket %(ticket)s "
+"validation: %(error)r"
+msgstr ""
+"您的身份提供者 CAS 对凭证 %(ticket)s 返回了无效响应"
+"校验: %(error)r"
+
+#: views.py:513
+msgid "Invalid login ticket, please try to log in again"
+msgstr "无效登录凭证, 请尝试重新登录"
+
+#: views.py:706
+#, python-format
+msgid "Authentication has been required by service %(name)s (%(url)s)"
+msgstr "服务 %(name)s (%(url)s) 需要认证"
+
+#: views.py:744
+#, python-format
+msgid "Service %(url)s not allowed."
+msgstr "不允许的服务 %(url)s"
+
+#: views.py:751
+msgid "Username not allowed"
+msgstr "不允许的用户名"
+
+#: views.py:758
+msgid "User characteristics not allowed"
+msgstr "不允许的用户特征"
+
+#: views.py:765
+#, python-format
+msgid "The attribute %(field)s is needed to use that service"
+msgstr "使用那个服务需要属性 %(field)s"
+
+#: views.py:857
+#, python-format
+msgid "Authentication renewal required by service %(name)s (%(url)s)."
+msgstr "服务 %(name)s (%(url)s) 需要更新认证"
+
+#: views.py:864
+#, python-format
+msgid "Authentication required by service %(name)s (%(url)s)."
+msgstr "服务 %(name)s (%(url)s) 需要认证."
+
+#: views.py:872
+#, python-format
+msgid "Service %s not allowed"
+msgstr "不允许的服务 %s"
diff --git a/cas_server/tests/settings.py b/cas_server/tests/settings.py
index 1a06d3c..5fb28e5 100644
--- a/cas_server/tests/settings.py
+++ b/cas_server/tests/settings.py
@@ -90,7 +90,8 @@
 
 USE_I18N = True
 
-USE_L10N = True
+if django.VERSION < (4, 0):
+    USE_L10N = True
 
 USE_TZ = True
 
diff --git a/cas_server/tests/test_utils.py b/cas_server/tests/test_utils.py
index 3064abf..d690724 100644
--- a/cas_server/tests/test_utils.py
+++ b/cas_server/tests/test_utils.py
@@ -10,6 +10,7 @@
 #
 # (c) 2016 Valentin Samir
 """Tests module for utils"""
+import django
 from django.test import TestCase, RequestFactory
 from django.db import connection
 
@@ -173,10 +174,11 @@ def test_import_attr(self):
             utils.import_attr('cas_server.utils.toto')
         with self.assertRaises(ValueError):
             utils.import_attr('toto')
-        self.assertEqual(
-            utils.import_attr('cas_server.default_app_config'),
-            'cas_server.apps.CasAppConfig'
-        )
+        if django.VERSION < (3, 2):
+            self.assertEqual(
+                utils.import_attr('cas_server.default_app_config'),
+                'cas_server.apps.CasAppConfig'
+            )
         self.assertEqual(utils.import_attr(utils), utils)
 
     def test_update_url(self):
diff --git a/cas_server/tests/test_view.py b/cas_server/tests/test_view.py
index a1aba1b..99ef9ce 100644
--- a/cas_server/tests/test_view.py
+++ b/cas_server/tests/test_view.py
@@ -262,7 +262,7 @@ def assert_ticket_attributes(self, client, ticket_value):
         # check that the service pattern registered on the ticket is the on we use for tests
         self.assertEqual(ticket.service_pattern, self.service_pattern)
 
-    def assert_service_ticket(self, client, response):
+    def assert_service_ticket(self, client, response, service="https://www.example.com"):
         """check that a ticket is well emited when requested on a allowed service"""
         # On ticket emission, we should be redirected to the service url, setting the ticket
         # GET parameter
@@ -270,7 +270,7 @@ def assert_service_ticket(self, client, response):
         self.assertTrue(response.has_header('Location'))
         self.assertTrue(
             response['Location'].startswith(
-                "https://www.example.com?ticket=%s-" % settings.CAS_SERVICE_TICKET_PREFIX
+                "%s?ticket=%s-" % (service, settings.CAS_SERVICE_TICKET_PREFIX)
             )
         )
         # check that the value of the ticket GET parameter match the value of the ticket
@@ -337,6 +337,19 @@ def test_view_login_get_denied_service_no_message(self):
         self.assertFalse(b"Service https://www.example.net not allowed" in response.content)
 
     def test_view_login_get_auth_allowed_service(self):
+        """
+        Request a ticket for an allowed service by an authenticated client containing
+        non ascii char in url
+        """
+        # get a client that is already authenticated
+        client = get_auth_client()
+        # ask for a ticket for https://www.example.com
+        response = client.get("/login?service=https://www.example.com/é")
+        # as https://www.example.com/é is a valid service a ticket should be created and the
+        # user redirected to the service url
+        self.assert_service_ticket(client, response, service="https://www.example.com/%C3%A9")
+
+    def test_view_login_get_auth_allowed_service_non_ascii(self):
         """Request a ticket for an allowed service by an authenticated client"""
         # get a client that is already authenticated
         client = get_auth_client()
diff --git a/cas_server/utils.py b/cas_server/utils.py
index 4ec2333..31d923e 100644
--- a/cas_server/utils.py
+++ b/cas_server/utils.py
@@ -249,15 +249,25 @@ def update_url(url, params):
         :return: The URL with an updated querystring
         :rtype: unicode
     """
-    if not isinstance(url, bytes):
-        url = url.encode('utf-8')
-    for key, value in list(params.items()):
-        if not isinstance(key, bytes):
-            del params[key]
-            key = key.encode('utf-8')
-        if not isinstance(value, bytes):
-            value = value.encode('utf-8')
-        params[key] = value
+    def to_unicode(data):
+        if isinstance(data, bytes):
+            return data.decode('utf-8')
+        else:
+            return data
+
+    def to_bytes(data):
+        if not isinstance(data, bytes):
+            return data.encode('utf-8')
+        else:
+            return data
+
+    if six.PY3:
+        url = to_unicode(url)
+        params = {to_unicode(key): to_unicode(value) for (key, value) in params.items()}
+    else:
+        url = to_bytes(url)
+        params = {to_bytes(key): to_bytes(value) for (key, value) in params.items()}
+
     url_parts = list(urlparse(url))
     query = dict(parse_qsl(url_parts[4], keep_blank_values=True))
     query.update(params)
@@ -265,10 +275,12 @@ def update_url(url, params):
     query = list(query.items())
     query.sort()
     url_query = urlencode(query)
-    if not isinstance(url_query, bytes):  # pragma: no cover in python3 urlencode return an unicode
-        url_query = url_query.encode("utf-8")
     url_parts[4] = url_query
-    return urlunparse(url_parts).decode('utf-8')
+    url = urlunparse(url_parts)
+
+    if isinstance(url, bytes):
+        url = url.decode('utf-8')
+    return url
 
 
 def unpack_nested_exception(error):
diff --git a/cas_server/views.py b/cas_server/views.py
index bbf5490..d26309e 100644
--- a/cas_server/views.py
+++ b/cas_server/views.py
@@ -153,6 +153,16 @@ def init_get(self, request):
         self.url = request.GET.get('url')
         self.ajax = settings.CAS_ENABLE_AJAX_AUTH and 'HTTP_X_AJAX' in request.META
 
+    @staticmethod
+    def delete_cookies(response):
+        if settings.CAS_REMOVE_DJANGO_SESSION_COOKIE_ON_LOGOUT:
+            response.delete_cookie(settings.SESSION_COOKIE_NAME)
+        if settings.CAS_REMOVE_DJANGO_CSRF_COOKIE_ON_LOGOUT:
+            response.delete_cookie(settings.CSRF_COOKIE_NAME)
+        if settings.CAS_REMOVE_DJANGO_LANGUAGE_COOKIE_ON_LOGOUT:
+            response.delete_cookie(settings.LANGUAGE_COOKIE_NAME)
+        return response
+
     def get(self, request, *args, **kwargs):
         """
             method called on GET request on this view
@@ -181,15 +191,15 @@ def get(self, request, *args, **kwargs):
                 response = HttpResponseRedirect(utils.update_url(url, params))
                 if request.GET.get("forget_provider"):
                     response.delete_cookie("remember_provider")
-                return response
+                return self.delete_cookies(response)
         # if service is set, redirect to service after logout
         if self.service:
             list(messages.get_messages(request))  # clean messages before leaving the django app
-            return HttpResponseRedirect(self.service)
+            return self.delete_cookies(HttpResponseRedirect(self.service))
         # if service is not set but url is set, redirect to url after logout
         elif self.url:
             list(messages.get_messages(request))  # clean messages before leaving the django app
-            return HttpResponseRedirect(self.url)
+            return self.delete_cookies(HttpResponseRedirect(self.url))
         else:
             # build logout message depending of the number of sessions the user logs out
             if session_nb == 1:
@@ -224,19 +234,19 @@ def get(self, request, *args, **kwargs):
                         'url': url,
                         'session_nb': session_nb
                     }
-                    return json_response(request, data)
+                    return self.delete_cookies(json_response(request, data))
                 else:
-                    return redirect("cas_server:login")
+                    return self.delete_cookies(redirect("cas_server:login"))
             else:
                 if self.ajax:
                     data = {'status': 'success', 'detail': 'logout', 'session_nb': session_nb}
-                    return json_response(request, data)
+                    return self.delete_cookies(json_response(request, data))
                 else:
-                    return render(
+                    return self.delete_cookies(render(
                         request,
                         settings.CAS_LOGOUT_TEMPLATE,
                         utils.context({'logout_msg': logout_msg})
-                    )
+                    ))
 
 
 class FederateAuth(CsrfExemptView):
diff --git a/pytest.ini b/pytest.ini
index 74acafe..809f960 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,4 +2,4 @@
 testpaths = cas_server/tests/
 DJANGO_SETTINGS_MODULE = cas_server.tests.settings
 norecursedirs = .* build dist docs
-python_paths = .
+pythonpath = .
diff --git a/requirements-dev.txt b/requirements-dev.txt
index b793b42..eb0f952 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,8 +4,7 @@ requests_futures>=0.9.5
 lxml>=3.4
 six>=1.8
 tox>=1.8.1
-pytest>=2.6.4
+pytest>=7
 pytest-django>=2.8.0
-pytest-pythonpath>=0.3
 pytest-cov>=2.2.1
 mock>=1
diff --git a/requirements.txt b/requirements.txt
index ced9200..da78ada 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-Django >= 1.11,<3.3
+Django >= 1.11,<4.2
 setuptools>=5.5
 requests>=2.4
 requests_futures>=0.9.5
diff --git a/setup.py b/setup.py
index 6210936..53d2b14 100644
--- a/setup.py
+++ b/setup.py
@@ -40,14 +40,13 @@
             'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
             'Operating System :: OS Independent',
             'Programming Language :: Python',
-            'Programming Language :: Python :: 2',
-            'Programming Language :: Python :: 2.7',
             'Programming Language :: Python :: 3',
             'Programming Language :: Python :: 3.5',
             'Programming Language :: Python :: 3.6',
             'Programming Language :: Python :: 3.7',
             'Programming Language :: Python :: 3.8',
             'Programming Language :: Python :: 3.9',
+            'Programming Language :: Python :: 3.10',
             'Topic :: Software Development :: Libraries :: Python Modules',
             'Topic :: Internet :: WWW/HTTP',
             'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
@@ -62,7 +61,7 @@
         },
         keywords=['django', 'cas', 'cas3', 'server', 'sso', 'single sign-on', 'authentication', 'auth'],
         install_requires=[
-            'Django >= 1.11,<3.3', 'requests >= 2.4', 'requests_futures >= 0.9.5',
+            'Django >= 1.11,<4.2', 'requests >= 2.4', 'requests_futures >= 0.9.5',
             'lxml >= 3.4', 'six >= 1'
         ],
         url="https://github.com/nitmir/django-cas-server",
diff --git a/tox.ini b/tox.ini
index 265b4ef..8838364 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,11 +2,12 @@
 envlist=
     flake8,
     check_rst,
-    py27-django111,
     py3-django111,
     py3-django22,
     py3-django31,
     py3-django32,
+    py3-django40,
+    py3-django41,
 
 ##################
 # generic config #
@@ -117,6 +118,18 @@ deps =
     Django>=3.2,<3.3
     {[base]deps}
 
+[testenv:py3-django40]
+basepython=python3
+deps =
+    Django>=4.0,<4.1
+    {[base]deps}
+
+[testenv:py3-django41]
+basepython=python3
+deps =
+    Django>=4.1,<4.2
+    {[base]deps}
+
 #########################
 # Debian strech support #
 #########################
@@ -167,9 +180,9 @@ deps =
     Django>=2.2,<3.0
     {[base]deps}
 
-##############################################
-# Debian bullseye and Ubuntu hirsute support #
-##############################################
+#########################################################
+# Debian bullseye and Ubuntu hirsute and impish support #
+#########################################################
 
 [testenv:py39-django22]
 basepython=python3.9
@@ -177,6 +190,17 @@ deps =
     Django>=2.2,<3.0
     {[base]deps}
 
+####################################
+# Ubuntu jammy and kinetic support #
+####################################
+
+[testenv:py310-django32]
+basepython=python3.10
+deps =
+    Django>=3.2,<3.3
+    {[base]deps}
+
+
 #######################################
 # Django additional supported version #
 #######################################
@@ -193,3 +217,15 @@ basepython=python3.9
 deps =
     Django>=3.2,<3.3
     {[base]deps}
+
+[testenv:py310-django40]
+basepython=python3.10
+deps =
+    Django>=4.0,<4.1
+    {[base]deps}
+
+[testenv:py310-django41]
+basepython=python3.10
+deps =
+    Django>=4.1,<4.2
+    {[base]deps}