diff --git a/tox.ini b/tox.ini
index 2f183e5..30b221a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = flake8, py26, py27, py34, py35, pypy
+envlist = flake8, py26, py27, py34, py35, py36, py37, py38, pypy
 
 [flake8]
 max-line-length = 120