diff --git a/tox.ini b/tox.ini
index e76fbb1..363e608 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,8 +4,8 @@
 # and then run "tox" from this directory.
 
 [tox]
-# envlist = py27,py34,py35,py36,py37
-envlist = py38
+# envlist = py27,py34,py35,py36,py37,py38,py39
+envlist = py39
 
 [testenv]
 commands =