diff --git a/README.md b/README.md
index ad605d7..6c16f8d 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ you provide us your `moderngl.Context`.
 ## Install
 
 ```bash
-pip install moderngl-window
+$ pip install moderngl-window
 ```
 
 ## Supported Platforms
@@ -67,13 +67,13 @@ Test.run()
 Run the example with different window backends:
 
 ```bash
-python test.py --window pyglet
-python test.py --window pygame2
-python test.py --window glfw
-python test.py --window sdl2
-python test.py --window pyside2
-python test.py --window pyqt5
-python test.py --window tk
+$ python test.py --window pyglet
+$ python test.py --window pygame2
+$ python test.py --window glfw
+$ python test.py --window sdl2
+$ python test.py --window pyside2
+$ python test.py --window pyqt5
+$ python test.py --window tk
 ```
 
 `WindowConfig` classes are the simplest way to get started without knowing
@@ -82,15 +82,14 @@ or examples.
 
 ## Setup from source
 
-We assume the user knows how to handle vitrualenvs.
+We assume the user knows how to handle virtualenvs.
 
 ```bash
 # Install the package in editable mode
 $ pip install -e .
 
-# Set up and dev requirements
-pip install -r requirements.txt
-pip install -r tests/requirements.txt
+# Install test and development requirements
+$ pip install -e .[tests]
 ```
 
 ## Running Tests
@@ -98,19 +97,19 @@ pip install -r tests/requirements.txt
 Tests are set up with `tox` running pytest with coverage and flake8.
 
 ```bash
-pip install -r tests/requirements.txt
-tox -e py36
-tox -e py37
-tox -e py38
-tox -e py39
-tox -e pep8
+$ pip install -e .[tests]
+$ tox -e py36
+$ tox -e py37
+$ tox -e py38
+$ tox -e py39
+$ tox -e pep8
 ```
 
 ## Building Docs
 
 ```bash
-pip install -r docs/requirements.txt
-python setup.py build_sphinx
+$ pip install -e .[docs]
+$ sphinx-build -b html docs docs/_build
 ```
 
 ## Contributing
diff --git a/setup.cfg b/setup.cfg
index daf4b53..1900b2f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -63,3 +63,6 @@ docs =
     sphinx-rtd-theme
     sphinxcontrib-napoleon
     doc8
+
+[coverage:run]
+source = moderngl_window
diff --git a/tox.ini b/tox.ini
index 7034793..56e3f59 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,30 +4,29 @@
 [tox]
 skipsdist = True
 envlist =
-    py35
     py36
     py37
     py38
+    py39
     pep8
 
 [gh-actions]
 python =
-    3.5: py35
     3.6: py36
     3.7: py37
     3.8: py38
-    pep8: py38
+    3.9: py39
 
 [testenv]
 usedevelop = True
 basepython =
-    py35: python3.5
     py36: python3.6
     py37: python3.7
     py38: python3.8
+    py39: python3.9
 extras = tests
 commands =
-    coverage run --source=moderngl_window -m pytest tests/
+    coverage run -m pytest tests/
     coverage report
 
 [testenv:pep8]