diff --git a/polygon-yolov5/utils/google_app_engine/additional_requirements.txt b/polygon-yolov5/utils/google_app_engine/additional_requirements.txt
index 2f81c8b..292aba8 100644
--- a/polygon-yolov5/utils/google_app_engine/additional_requirements.txt
+++ b/polygon-yolov5/utils/google_app_engine/additional_requirements.txt
@@ -2,3 +2,4 @@
 pip==19.2
 Flask==1.0.2
 gunicorn==19.9.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability