diff --git a/docs/requirements.txt b/docs/requirements.txt
index ccab21128..bfa3e7baf 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
 sphinx-rtd-theme
 sphinx
 recommonmark
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability