diff --git a/requirements.txt b/requirements.txt
index a268cb0..d9fb350 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,3 +39,4 @@ six==1.14.0
 versionfinder>=1.0.0
 wishlist==0.2.2
 Werkzeug==1.0.1
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability