diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7c0007c..04789e0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["3.6", "3.7", "3.8", "3.9"]
+        python: ["3.6", "3.7", "3.8", "3.9", "3.10"]
         os: [ubuntu-latest, windows-latest]
         include:
           - python: "3.6"
@@ -21,6 +21,8 @@ jobs:
             tox_env: "py38"
           - python: "3.9"
             tox_env: "py39"
+          - python: "3.10"
+            tox_env: "py310"
 
     steps:
     - uses: actions/checkout@v1
diff --git a/setup.py b/setup.py
index d252141..24a803a 100644
--- a/setup.py
+++ b/setup.py
@@ -1,15 +1,10 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-"""The setup script."""
-import io
-
 from setuptools import find_packages
 from setuptools import setup
 
-with io.open("README.rst", encoding="UTF-8") as readme_file:
+with open("README.rst", encoding="UTF-8") as readme_file:
     readme = readme_file.read()
 
-with io.open("CHANGELOG.rst", encoding="UTF-8") as changelog_file:
+with open("CHANGELOG.rst", encoding="UTF-8") as changelog_file:
     history = changelog_file.read()
 
 requirements = ["attrs>=18.1.0", "numpy>=1.11.0", "oop-ext>=1.1"]
@@ -38,6 +33,7 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
     ],
     description="Python package to manage units for physical quantities",
     extras_require=extras_require,
diff --git a/tox.ini b/tox.ini
index eba3913..bbafc4d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py36, py37, py38, py39, linting, docs
+envlist = py36, py37, py38, py39, py310, linting, docs
 
 [testenv]
 passenv = TOXENV CI TRAVIS TRAVIS_* APPVEYOR APPVEYOR_*