diff --git a/pyproject.toml b/pyproject.toml
index 4b00c91..9d8d451 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ docs = [
 test = [
   "pytest >= 7.2.0",
   "pytest-cov >= 4.0.0",
-  "tox >= 3.27.1, < 4",
+  "tox >= 3.27.1, < 5",
   "tox-pyenv >= 1.1.0"
 ]