diff --git a/README.md b/README.md
index 102fe01..bb0cdfb 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 This project provides a `@hook` decorator as well as a base model and mixin to add lifecycle hooks to your Django models. Django's built-in approach to offering lifecycle hooks is [Signals](https://docs.djangoproject.com/en/dev/topics/signals/). However, my team often finds that Signals introduce unnecessary indirection and are at odds with Django's "fat models" approach.
 
-**Django Lifecycle Hooks** supports Python 3.5, 3.6, 3.7 and 3.8, Django 2.0.x, 2.1.x, 2.2.x and 3.0.x.
+**Django Lifecycle Hooks** supports Python 3.5, 3.6, 3.7, 3.8 and 3.9, Django 2.0.x, 2.1.x, 2.2.x, 3.0.x and 3.1.x.
 
 In short, you can write model code like this:
 
diff --git a/docs/index.md b/docs/index.md
index d763cb2..2f0cb75 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -52,8 +52,8 @@ Instead of overriding `save` and `__init__` in a clunky way that hurts readabili
 
 ## Requirements
 
-* Python (3.3+)
-* Django (1.8+)
+* Python (3.5+)
+* Django (2.0+)
 
 ## Installation
 
@@ -87,6 +87,4 @@ class YourModel(LifecycleModelMixin, models.Model):
 
 ```
 
-If you are using **Django 1.8 or below** and want to extend the base model, you also have to add `django_lifecycle` to `INSTALLED_APPS`.
-
 [Read on](examples.md) to see more examples of how to use lifecycle hooks.
diff --git a/setup.py b/setup.py
index b96956b..8b7c7e4 100644
--- a/setup.py
+++ b/setup.py
@@ -31,11 +31,13 @@ def readme():
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
     "Framework :: Django",
     "Framework :: Django :: 2.0",
     "Framework :: Django :: 2.1",
     "Framework :: Django :: 2.2",
     "Framework :: Django :: 3.0",
+    "Framework :: Django :: 3.1",
 ]
 setup(
     name="django-lifecycle",
diff --git a/tox.ini b/tox.ini
index effb263..4b58b81 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,11 @@
 [tox]
 toxworkdir={env:TOXWORKDIR:{toxinidir}/.tox}
 envlist =
-    {py35,py36,py37,py38}-django20
-    {py35,py36,py37,py38}-django21
-    {py35,py36,py37,py38}-django22
-    {py36,py37,py38}-django30
-    {py36,py37,py38}-django31
+    {py35,py36,py37}-django20
+    {py35,py36,py37}-django21
+    {py35,py36,py37,py38,py39}-django22
+    {py36,py37,py38,py39}-django30
+    {py36,py37,py38,py39}-django31
     flake8
 skip_missing_interpreters = True
 
@@ -24,11 +24,11 @@ deps =
     django21: django>=2.1,<2.2
     django22: django>=2.2,<3
     django30: django>=3.0,<3.1
-    django31: django>=3.1,<4
+    django31: django>=3.1,<3.2
 
 [testenv:flake8]
 basepython = python3.7
 deps =
-    flake8==3.8.2
+    flake8==3.8.4
 commands =
     flake8 . --exclude=venv/,.tox/,django_lifecycle/__init__.py