diff --git a/requirements.txt b/requirements.txt
index c7057ef..47e4b24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,5 @@ mypy
 flake8
 
 # test requirements
-pytest
\ No newline at end of file
+pytest
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file