diff --git a/test-requirements.txt b/test-requirements.txt
index 2702246..9b29a75 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,3 +3,4 @@ nose>=1.3.7
 pluggy>=0.3.1
 py>=1.4.31
 randomize>=0.13
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability