diff --git a/requirements.txt b/requirements.txt
index 2b5ec63..3b4855f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ setuptools >= 21.0.0
 opencv-python >= 3.4.0
 numpy >= 1.14
 flask-testing
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability