diff --git a/tox.ini b/tox.ini
index 81e24ca..309b5f5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py36,py38,pep8,pylint,docs
+envlist = py36,py38,py39,pep8,pylint,docs
 minversion = 2.0
 skipsdist = True
 
@@ -24,6 +24,9 @@ basepython = python3.6
 [testenv:py38]
 basepython = python3.8
 
+[testenv:py39]
+basepython = python3.9
+
 [testenv:pep8]
 commands = flake8 {posargs}