diff --git a/tox.ini b/tox.ini
index 7ccf3a8e..049ca546 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist = py3,flake8
-minversion = 3.1.0
+minversion = 3.18.0
 skip_missing_interpreters = true
 # this allows tox to infer the base python from the environment name
 # and override any basepython configured in this file