diff --git a/requirements.txt b/requirements.txt
index a3fdc81..9ac732d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,3 +11,4 @@ MarkupSafe==2.1.1
 pytz==2022.1
 six==1.16.0
 Werkzeug==2.2.1
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability