diff --git a/setup.cfg b/setup.cfg
index 09afb3e..297efe2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -86,7 +86,7 @@ dev =
     pre-commit
     sphinx==3.2.1
     sphinxcontrib-napoleon
-    tox==3.28.0
+    tox==4.18.1
     flask_testing==0.8.0
     sphinx-rtd-theme==0.5.0
     sphinx-argparse==0.2.5