diff --git a/python-mip-sklearn/sklearn_to_pfa/requirements-dev.txt b/python-mip-sklearn/sklearn_to_pfa/requirements-dev.txt
index 31b6c8a..eb21f38 100644
--- a/python-mip-sklearn/sklearn_to_pfa/requirements-dev.txt
+++ b/python-mip-sklearn/sklearn_to_pfa/requirements-dev.txt
@@ -1,3 +1,4 @@
 wheel>=0.30.0
 setuptools>=39.0.1
 pytest
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability