diff --git a/tox.ini b/tox.ini
index ab994a2e..2705547c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-minversion = 3.10
+minversion = 4.0
 envlist =
     flake8
     mypy-{locked,lowest}