diff --git a/tox.ini b/tox.ini
index a4dda71cd..4e5b2c36b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
-minversion = 2.0
-envlist = py27,py39,pep8,releasenotes
+minversion = 3.18.0
+envlist = py39,pep8,releasenotes
 skipsdist = False
 
 [testenv]