1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 8a47458..ed8ebef 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 # Generated from:
 # https://github.com/zopefoundation/meta/tree/master/config/c-code
 [tox]
-minversion = 3.18
+minversion = 4.0
 envlist =
     lint
     py37,py37-pure