diff --git a/tox.ini b/tox.ini
index ed4b5fb1..5a2a84ab 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 skipsdist = True
-envlist = py37,py38
+envlist = py37,py38,py39
 skip_missing_interpreters = true
 [testenv]
 deps =