diff --git a/requirements_tests.txt b/requirements_tests.txt
index f0dc845..fc7a82d 100644
--- a/requirements_tests.txt
+++ b/requirements_tests.txt
@@ -1,2 +1,3 @@
 pytest>=4.4.1
-mock
\ No newline at end of file
+mock
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file