diff --git a/pyproject.toml b/pyproject.toml
index e76dae3..6649f82 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ docutils = "0.21.2"
 
 
 [tool.poetry.group.dev.dependencies]
-tox = "4.16.0"
+tox = "4.20.0"
 
 
 [tool.poetry.group.test.dependencies]