diff --git a/setup.cfg b/setup.cfg
index 09cd466..2a31423 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ console_scripts =
     gbasm = gbasm.gbasm:main
 
 [tox:tox]
-envlist = py39
+envlist = py3{7,8,9}
 
 [testenv]
 deps = pytest