diff --git a/webapp/requirements.txt b/webapp/requirements.txt
index 5b614272..258690b1 100644
--- a/webapp/requirements.txt
+++ b/webapp/requirements.txt
@@ -2,3 +2,4 @@ gunicorn
 Flask
 Jinja2
 Werkzeug
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability