diff --git a/requirements.txt b/requirements.txt
index 9c93144..7f46fd0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@ Flask
 tensorflow
 gunicorn
 pytest
-scipy
\ No newline at end of file
+scipy
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file