diff --git a/requirements.txt b/requirements.txt
index 225fcee..c3b0ce7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 Flask==2.1.2
 Werkzeug==2.2.3
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability