diff --git a/requirements.txt b/requirements.txt
index b7d53d5..fad6e50 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ python-coveralls
 mock
 munch
 nose
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability