diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 4200623..d1c43c3 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -57,6 +57,17 @@ If you are proposing a feature:
 Get Started!
 ------------
 
+Using docker
+------------
+
+1. make -f Makefile.dev dev-setup
+   1. make -f Makefile.dev dev-shell
+2. make -f Makefile.dev test
+3. make -f Makefile.dev tox
+
+From Source Code
+-----------
+
 Ready to contribute? Here's how to set up `facho` for local development.
 
 1. Fork the `facho` repo .
@@ -94,13 +105,6 @@ Ready to contribute? Here's how to set up `facho` for local development.
 
 7. Submit a pull request through the GitHub website.
 
-Using docker
-------------
-
-1. make -f Makefile.dev build
-2. make -f Makefile.dev dev-shell
-3. make -f Makefile.dev python3.8 setup.py develop
-4. make -f Makefile.dev python3.8 setup.py test
 
 Pull Request Guidelines
 -----------------------
diff --git a/Dockerfile b/Dockerfile
index ee5d265..b7a3dcf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,6 @@ RUN apt-get install -y --no-install-recommends \
   ca-certificates
 
 RUN wget https://bootstrap.pypa.io/get-pip.py \
-  && python3 get-pip.py pip==21.3 \
   && python3.7 get-pip.py pip==21.3 \
   && python3.8 get-pip.py pip==21.3 \
   && rm get-pip.py
@@ -20,11 +19,9 @@ RUN apt-get install -y --no-install-recommends \
         build-essential \
         zip
 
-RUN python3.6 --version
 RUN python3.7 --version
 RUN python3.8 --version
 
-RUN pip3.6 install setuptools setuptools-rust
 RUN pip3.7 install setuptools setuptools-rust
 RUN pip3.8 install setuptools setuptools-rust
 
diff --git a/tox.ini b/tox.ini
index f7186a0..2fee393 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,10 @@
 [tox]
-envlist = py27, py34, py35, py36, flake8
+envlist = py37, py38
 
 [travis]
 python =
-    3.6: py36
-    3.5: py35
-    3.4: py34
-    2.7: py27
-
-[testenv:flake8]
-basepython = python
-deps = flake8
-commands = flake8 facho
+    3.7: py37
+    3.8: py38
 
 [testenv]
 setenv =