diff --git a/requirements.txt b/requirements.txt
index 456ee79..afaf35c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ python-dateutil>=2.6.0
 requests>=2.11.1
 rstvalidator>=2020.12.3
 twine>=3.4.2
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability