diff --git a/tests/requirements.txt b/tests/requirements.txt
index 15cc901..2683e19 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,3 +1,4 @@
 sqlalchemy
 mock==2.0.0
 nose==1.3.7
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability