diff --git a/requirements.txt b/requirements.txt
index de6c011..7c7a059 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,4 +10,5 @@ htmlmin
 pytz
 flake8
 pylint
-black
\ No newline at end of file
+black
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file