diff --git a/requirements.txt b/requirements.txt
index cea426e4..66b483bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,3 +41,4 @@ webob
 ziggurat_foundations==0.9.1
 zope.interface>=4.7.2,<5
 zope.sqlalchemy==1.6
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability