diff --git a/setup.py b/setup.py
index abff164..14c0755 100644
--- a/setup.py
+++ b/setup.py
@@ -31,8 +31,9 @@ setup(
         'Environment :: Web Environment',
         'Framework :: Django',
         'Framework :: Django :: 2.2',
-        'Framework :: Django :: 3.0',
         'Framework :: Django :: 3.1',
+        'Framework :: Django :: 3.2',
+        'Framework :: Django :: 4.0',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
diff --git a/tests/testproject/settings.py b/tests/testproject/settings.py
index ccd75a6..687037a 100644
--- a/tests/testproject/settings.py
+++ b/tests/testproject/settings.py
@@ -29,3 +29,5 @@ TEMPLATES = [
         'APP_DIRS': True,
     },
 ]
+
+USE_TZ = False
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index b30307f..8a9bd13 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -37,7 +37,7 @@ class MyUser(AbstractBaseUser):
     USERNAME_FIELD = 'identity'
 
     class Meta:
-        abstract = True
+        abstract = False
         app_label = 'testapp'
 
 
diff --git a/tox.ini b/tox.ini
index 7bea9f2..6690cb6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,8 @@
 [tox]
 envlist =
     # Python/Django combinations that are officially supported
-    py{36,37,38,39}-django{22,30,31}
+    py{36,37,38,39}-django{22,31,32}
+    py{38,39}-django{40}
     py37-{flake8,bandit,readme,docs,isort}
 
 [testenv]
@@ -10,8 +11,9 @@ deps =
     coverage
     pytest-django
     django22: Django>=2.2,<3.0
-    django30: Django>=3.0,<3.1
     django31: Django>=3.1,<3.2
+    django32: Django>=3.2,<4.0
+    django40: Django>=4.0a1,<4.1
 
 commands =
     coverage run -m pytest