diff --git a/tox.ini b/tox.ini
index 2318571..7cdc120 100644
--- a/tox.ini
+++ b/tox.ini
@@ -273,3 +273,4 @@ python =
   3.6: py36,coveralls,black,yamllint,custom
   3.7: py37,coveralls,custom
   3.8: py38,coveralls,custom
+  3.8-dev: py38,coveralls,custom