diff --git a/test-requirements.txt b/test-requirements.txt
index b84cb24..b5da428 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,3 +3,4 @@ pbr
 pytest
 tox
 wheel
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability