diff --git a/python/requirements.txt b/python/requirements.txt
index 1fcc2de..c794466 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -2,3 +2,4 @@ click==8.0.3
 pytest==5.1.1
 setuptools==58.3.0
 vcfpy==0.13.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability