diff --git a/tox.ini b/tox.ini
index e786626..c1baf1e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.1
-envlist = py38,pypy,pep8
+envlist = py39,pypy,pep8
 skipsdist = True
 ignore_basepython_conflict = True