diff --git a/requirements.txt b/requirements.txt
index ea16a50..ee6d40e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ pytest==8.3.3
 setuptools==75.3.0
 toil[cwl]==7.0.0
 pytest-runner==6.0.1
-tox==3.27.1
+tox==4.23.2