diff --git a/.gitignore b/.gitignore
index 21038d5..2c86369 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 .cache/
 .eggs/
 .installed.cfg
+.idea
 bin
 develop-eggs
 django_multisite.egg-info/
@@ -15,3 +16,5 @@ multisite/*.egg-info
 .coverage
 .tox/
 .pytest_cache/
+.env
+build
diff --git a/README.rst b/README.rst
index 67f39b3..d0c08ee 100644
--- a/README.rst
+++ b/README.rst
@@ -35,6 +35,12 @@ Replace your SITE_ID in settings.py to::
     from multisite import SiteID
     SITE_ID = SiteID(default=1)
 
+Beginning with django 3.2 the sites framework performs a check to ensure that :code:`SITE_ID` is an integer.
+Add the following to the top of settings.py to use our check to allow integer or :code:`SiteID`::
+
+    from multisite import checks
+
+
 Add these to your INSTALLED_APPS::
 
     INSTALLED_APPS = [
diff --git a/multisite/admin.py b/multisite/admin.py
index 374708f..d51b5ac 100644
--- a/multisite/admin.py
+++ b/multisite/admin.py
@@ -1,6 +1,3 @@
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 from django.contrib import admin
 from django.contrib.admin.views.main import ChangeList
 from django.contrib.sites.models import Site
@@ -19,6 +16,7 @@ class AliasAdmin(admin.ModelAdmin):
     readonly_fields = ('is_canonical',)
     search_fields = ('domain',)
 
+
 admin.site.register(Alias, AliasAdmin)
 
 
@@ -36,6 +34,7 @@ def get_queryset(self, request):
             qs = qs.order_by(*ordering)
         return qs
 
+
 # HACK: Monkeypatch AliasInline into SiteAdmin
 SiteAdmin.inlines = type(SiteAdmin.inlines)([AliasInline]) + SiteAdmin.inlines
 
diff --git a/multisite/checks.py b/multisite/checks.py
new file mode 100644
index 0000000..a26b66d
--- /dev/null
+++ b/multisite/checks.py
@@ -0,0 +1,20 @@
+from django.conf import settings
+from django.contrib.sites import checks
+from django.core.checks import Error
+
+from . import SiteID
+
+
+def check_site_id(app_configs, **kwargs):
+    """ Patch sites check because django 3.2 insists on an integer value for SITE_ID """
+    if (
+        hasattr(settings, 'SITE_ID') and
+        not isinstance(settings.SITE_ID, (type(None), int, SiteID))
+    ):
+        return [
+            Error('The SITE_ID setting must be an integer or SiteID', id='sites.E101'),
+        ]
+    return []
+
+
+checks.check_site_id = check_site_id
diff --git a/multisite/forms.py b/multisite/forms.py
index a100888..0eeeca1 100644
--- a/multisite/forms.py
+++ b/multisite/forms.py
@@ -1,7 +1,3 @@
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
-
 from django.contrib.sites.admin import SiteAdmin
 from django.core.exceptions import ValidationError
 
diff --git a/multisite/hacks.py b/multisite/hacks.py
index d0e2002..f275889 100644
--- a/multisite/hacks.py
+++ b/multisite/hacks.py
@@ -1,6 +1,3 @@
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import sys
 
 from django.conf import settings
diff --git a/multisite/hosts.py b/multisite/hosts.py
index 90525a9..7a01971 100644
--- a/multisite/hosts.py
+++ b/multisite/hosts.py
@@ -1,6 +1,3 @@
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 from django.utils.functional import empty, SimpleLazyObject
 
 
@@ -41,4 +38,5 @@ def __iter__(self):
         for host in self.alias_model.objects.values_list('domain'):
             yield host[0]
 
+
 ALLOWED_HOSTS = IterableLazyObject(lambda: AllowedHosts())
diff --git a/multisite/management/commands/update_public_suffix_list.py b/multisite/management/commands/update_public_suffix_list.py
index 88e6fdb..d71f301 100644
--- a/multisite/management/commands/update_public_suffix_list.py
+++ b/multisite/management/commands/update_public_suffix_list.py
@@ -1,7 +1,3 @@
-from __future__ import print_function
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import logging
 import os
 import tempfile
diff --git a/multisite/managers.py b/multisite/managers.py
index c4fee11..df94697 100644
--- a/multisite/managers.py
+++ b/multisite/managers.py
@@ -1,10 +1,7 @@
 # -*- coding: utf-8 -*
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
-from django.db import models
 from django.contrib.sites import managers
-from django.db.models.fields import FieldDoesNotExist
+from django.core.exceptions import FieldDoesNotExist
+from django.db import models
 from django.db.models.sql import constants
 
 
diff --git a/multisite/middleware.py b/multisite/middleware.py
index 5f37828..f444160 100644
--- a/multisite/middleware.py
+++ b/multisite/middleware.py
@@ -1,47 +1,29 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import os
 import tempfile
-try:
-    from urlparse import urlsplit, urlunsplit
-except ImportError:
-    from urllib.parse import urlsplit, urlunsplit
+from urllib.parse import urlsplit, urlunsplit
 
 import django
 from django.conf import settings
 from django.contrib.sites.models import Site, SITE_CACHE
 from django.core.exceptions import DisallowedHost
 from django.core import mail
-
 from django.core.cache import caches
-
-try:
-    # Django > 1.10 uses MiddlewareMixin
-    from django.utils.deprecation import MiddlewareMixin
-except ImportError:
-    MiddlewareMixin = object
-
 from django.core.exceptions import ImproperlyConfigured
-
-try:
-    from django.urls import get_callable
-except ImportError:
-    # Django < 1.10 compatibility
-    from django.core.urlresolvers import get_callable
-
+from django.urls import get_callable
 from django.db.models.signals import pre_save, post_delete, post_init
 from django.http import Http404, HttpResponsePermanentRedirect
 
 from hashlib import md5 as md5_constructor
 
+from django.utils.deprecation import MiddlewareMixin
+
 from .models import Alias
 
 
 class DynamicSiteMiddleware(MiddlewareMixin):
-    def __init__(self, *args, **kwargs):
-        super(DynamicSiteMiddleware, self).__init__(*args, **kwargs)
+    def __init__(self, get_response=None):
+        super().__init__(get_response)
         if not hasattr(settings.SITE_ID, 'set'):
             raise TypeError('Invalid type for settings.SITE_ID: %s' %
                             type(settings.SITE_ID).__name__)
@@ -222,8 +204,8 @@ def site_deleted_hook(self, *args, **kwargs):
 
 
 class CookieDomainMiddleware(MiddlewareMixin):
-    def __init__(self, *args, **kwargs):
-        super(CookieDomainMiddleware, self).__init__(*args, **kwargs)
+    def __init__(self, get_response=None):
+        super().__init__(get_response)
         self.depth = int(getattr(settings, 'MULTISITE_COOKIE_DOMAIN_DEPTH', 0))
         if self.depth < 0:
             raise ValueError(
diff --git a/multisite/migrations/0002_auto_20210520_1618.py b/multisite/migrations/0002_auto_20210520_1618.py
new file mode 100644
index 0000000..994682b
--- /dev/null
+++ b/multisite/migrations/0002_auto_20210520_1618.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.2.23 on 2021-05-20 16:18
+
+from django.db import migrations, models
+import multisite.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('multisite', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='alias',
+            name='is_canonical',
+            field=models.BooleanField(default=None, editable=False, help_text='Does this domain name match the one in site?', null=True, validators=[multisite.models.validate_true_or_none], verbose_name='is canonical?'),
+        ),
+    ]
diff --git a/multisite/models.py b/multisite/models.py
index 48b493d..eb2cfb5 100644
--- a/multisite/models.py
+++ b/multisite/models.py
@@ -1,6 +1,3 @@
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import operator
 from functools import reduce
 
@@ -11,15 +8,10 @@
 from django.db.models import Q
 from django.db.models.signals import pre_save, post_save
 from django.db.models.signals import post_migrate
-from django.utils.encoding import python_2_unicode_compatible
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 from .hacks import use_framework_for_site_cache
 
-try:
-    xrange
-except NameError:  # python3
-    xrange = range
 
 _site_domain = Site._meta.get_field('domain')
 
@@ -85,7 +77,7 @@ def _expand_netloc(cls, host, port=None):
             bits = host.split('.')
 
         result = []
-        for i in xrange(0, (len(bits) + 1)):
+        for i in range(0, (len(bits) + 1)):
             if i == 0:
                 host = '.'.join(bits[i:])
             else:
@@ -149,7 +141,6 @@ def validate_true_or_none(value):
         raise ValidationError(u'%r must be True or None' % value)
 
 
-@python_2_unicode_compatible
 class Alias(models.Model):
     """
     Model for domain-name aliases for Site objects.
@@ -168,9 +159,11 @@ class Alias(models.Model):
     site = models.ForeignKey(
         Site, related_name='aliases', on_delete=models.CASCADE
     )
-    is_canonical = models.NullBooleanField(
+    is_canonical = models.BooleanField(
         _('is canonical?'),
-        default=None, editable=False,
+        default=None,
+        editable=False,
+        null=True,
         validators=[validate_true_or_none],
         help_text=_('Does this domain name match the one in site?'),
     )
diff --git a/multisite/template/loaders/filesystem.py b/multisite/template/loaders/filesystem.py
index b061754..772e8df 100644
--- a/multisite/template/loaders/filesystem.py
+++ b/multisite/template/loaders/filesystem.py
@@ -1,25 +1,20 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import os
+
 from django.conf import settings
 from django.contrib.sites.models import Site
 from django.template.loaders.filesystem import Loader as FilesystemLoader
-from django import VERSION as django_version
 
 
 class Loader(FilesystemLoader):
     def get_template_sources(self, *args, **kwargs):
         template_name = args[0]
         domain = Site.objects.get_current().domain
-        default_dir = getattr(settings, 'MULTISITE_DEFAULT_TEMPLATE_DIR',
-                                        'default')
+        default_dir = getattr(
+            settings, 'MULTISITE_DEFAULT_TEMPLATE_DIR', 'default'
+        )
         for tname in (os.path.join(domain, template_name),
                       os.path.join(default_dir, template_name)):
-            if django_version < (2, 0, 0):
-                args = [tname, None]
-            else:
-                args = [tname]
+            args = [tname]
             for item in super(Loader, self).get_template_sources(*args, **kwargs):
                 yield item
diff --git a/multisite/template_loader.py b/multisite/template_loader.py
index 5461d86..1270a68 100644
--- a/multisite/template_loader.py
+++ b/multisite/template_loader.py
@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-from __future__ import absolute_import
 
 from .template.loaders.filesystem import Loader
 
diff --git a/multisite/test_settings.py b/multisite/test_settings.py
index 0f437b7..7519daa 100644
--- a/multisite/test_settings.py
+++ b/multisite/test_settings.py
@@ -1,4 +1,3 @@
-import django
 from multisite import SiteID
 
 SECRET_KEY = "iufoj=mibkpdz*%bob952x(%49rqgv8gg45k36kjcg76&-y5=!"
@@ -21,11 +20,5 @@
 MIDDLEWARE = [
     'multisite.middleware.DynamicSiteMiddleware',
 ]
-if django.VERSION < (1,10,0):
-    # we are backwards compatible, but the settings file format has changed post-1.10:
-    # https://docs.djangoproject.com/en/1.10/topics/http/middleware/#upgrading-pre-django-1-10-style-middleware
-    MIDDLEWARE_CLASSES = list(MIDDLEWARE)
-    del MIDDLEWARE
-
 
 TEST_RUNNER = 'django.test.runner.DiscoverRunner'
diff --git a/multisite/tests.py b/multisite/tests.py
index 2b46b4a..11fb6b7 100644
--- a/multisite/tests.py
+++ b/multisite/tests.py
@@ -9,26 +9,18 @@
 
 This file uses relative imports and so cannot be run standalone.
 """
-
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import django
 import logging
 import os
 import pytest
 import sys
 import tempfile
-import warnings
-from unittest import skipUnless
+from io import StringIO
+from unittest import mock, skipUnless
 
-try:
-    from unittest import mock
-except ImportError:
-    import mock
+from django.urls import re_path
 
 from django.conf import settings
-from django.conf.urls import url
 from django.contrib.sites.models import Site
 from django.core.exceptions import ImproperlyConfigured, ValidationError
 from django.core.management import call_command
@@ -36,9 +28,8 @@
 from django.template.loader import get_template
 from django.test import TestCase, override_settings
 from django.test.client import RequestFactory as DjangoRequestFactory
-from django.utils.six import StringIO
 
-from multisite import SiteDomain, SiteID, threadlocals
+from multisite import SiteDomain, SiteID
 
 from .hacks import use_framework_for_site_cache
 from .hosts import ALLOWED_HOSTS, AllowedHosts, IterableLazyObject
@@ -79,7 +70,7 @@ def test_get_current_site(self):
 # So create one:
 # (This is only used by test_integration)
 urlpatterns = [
-    url(r'^domain/$', lambda request, *args, **kwargs: HttpResponse(str(Site.objects.get_current())))
+    re_path(r'^domain/$', lambda request, *args, **kwargs: HttpResponse(str(Site.objects.get_current())))
 ]
 
 @pytest.mark.django_db
diff --git a/multisite/threadlocals.py b/multisite/threadlocals.py
index ec57c5f..47e8cad 100644
--- a/multisite/threadlocals.py
+++ b/multisite/threadlocals.py
@@ -1,17 +1,7 @@
 # -*- coding: utf-8 -*
-from __future__ import unicode_literals
-from __future__ import absolute_import
-
 import sys
-
-from django.utils import six
 from contextlib import contextmanager
-from warnings import warn
-
-try:
-    from threading import local
-except ImportError:
-    from django.utils._threading_local import local
+from threading import local
 
 from django.core.exceptions import ImproperlyConfigured
 
@@ -46,7 +36,7 @@ def __init__(self, default=None, *args, **kwargs):
         ``default``, if specified, determines the default SITE_ID,
         if that is unset.
         """
-        if default is not None and not isinstance(default, six.integer_types):
+        if default is not None and not isinstance(default, int):
             raise ValueError("%r is not a valid default." % default)
         self.default = default
         self.reset()
@@ -63,21 +53,21 @@ def __int__(self):
         return self.site_id
 
     def __lt__(self, other):
-        if isinstance(other, six.integer_types):
+        if isinstance(other, int):
             return self.__int__() < other
         elif isinstance(other, SiteID):
             return self.__int__() < other.__int__()
         return True
 
     def __le__(self, other):
-        if isinstance(other, six.integer_types):
+        if isinstance(other, int):
             return self.__int__() <= other
         elif isinstance(other, SiteID):
             return self.__int__() <= other.__int__()
         return True
 
     def __eq__(self, other):
-        if isinstance(other, six.integer_types):
+        if isinstance(other, int):
             return self.__int__() == other
         elif isinstance(other, SiteID):
             return self.__int__() == other.__int__()
@@ -137,7 +127,7 @@ def __init__(self, default, *args, **kwargs):
         # http://python-future.org/compatible_idioms.html#basestring and
         # https://github.com/PythonCharmers/python-future/blob/master/src/past/types/basestring.py
         # are not super informative, so just fall back on a literal version check:
-        if not isinstance(default, basestring if sys.version_info.major == 2 else str):
+        if not isinstance(default, str):
             raise TypeError("%r is not a valid default domain." % default)
         self.default_domain = default
         self.default = None
diff --git a/setup.py b/setup.py
index 757fc44..80f6390 100644
--- a/setup.py
+++ b/setup.py
@@ -1,15 +1,13 @@
 import os
-import sys
 
 from setuptools import find_packages, setup
 
 _dir_ = os.path.dirname(__file__)
 
-
-if sys.version_info < (3, 4):
-    install_requires = ['Django>=1.8,<2.0', 'tldextract>=1.2']
-else:
-    install_requires = ['Django>=1.8,<2.3', 'tldextract>=1.2']
+install_requires = [
+    'Django>=2.2,<4.0',
+    'tldextract>=1.2,<3'
+]
 
 
 def long_description():
@@ -17,6 +15,7 @@ def long_description():
     with open(os.path.join(_dir_, 'README.rst')) as f:
         return f.read()
 
+
 here = os.path.abspath(_dir_)
 version = {}
 with open(os.path.join(here, 'multisite', '__version__.py')) as f:
@@ -49,10 +48,10 @@ def long_description():
                    'License :: OSI Approved :: BSD License',
                    'Operating System :: OS Independent',
                    'Programming Language :: Python',
-                   'Programming Language :: Python :: 2.7',
-                   'Programming Language :: Python :: 3.4',
-                   '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',
                    'Topic :: Internet',
                    'Topic :: Internet :: WWW/HTTP',
                    'Topic :: Software Development :: Libraries',
diff --git a/tox.ini b/tox.ini
index 044bc32..4425f52 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,9 +8,10 @@ setenv=
     PYTHONPATH = {toxinidir}:{env:PYTHONPATH:}
 usedevelop = True
 envlist =
-    py36-django{2.2,2.1,2.0,1.11}
-    py35-django{2.1,2.0,1.11,1.10,1.9,1.8}
-    py27-django{1.11,1.10,1.9,1.8}
+    py36-django{2.2,3.0,3.1,3.2}
+    py37-django{2.2,3.0,3.1,3.2}
+    py38-django{2.2,3.0,3.1,3.2}
+    py39-django{2.2,3.0,3.1,3.2}
 
 [testenv]
 commands = pytest --cov --cov-config .coveragerc --pyargs multisite
@@ -21,11 +22,7 @@ deps =
     pytest-pythonpath
     pytest-django
 
-    py27: mock
     django2.2: Django>=2.2,<2.3
-    django2.1: Django>=2.1,<2.2
-    django2.0: Django>=2.0,<2.1
-    django1.11: Django>=1.11,<2.0
-    django1.10: Django>=1.10,<1.11
-    django1.9: Django>=1.9,<1.10
-    django1.8: Django>=1.8,<1.9
+    django3.0: Django>=3.0,<3.1
+    django3.1: Django>=3.1,<3.2
+    django3.2: Django>=3.2,<4.0