diff --git a/requirements-test.txt b/requirements-test.txt
index 75ac527..5a9091f 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1 +1,2 @@
 pytest>=4.0.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability