diff --git a/tox.ini b/tox.ini
index c2f0003..d838e2a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = python36,python37,python38,pylint,flake8
+envlist = python36,python37,python38,python39,pylint,flake8
 
 [flake8]
 max-line-length = 139