diff --git a/docs/build/requirements.txt b/docs/build/requirements.txt
index 1c483f3..4218f59 100644
--- a/docs/build/requirements.txt
+++ b/docs/build/requirements.txt
@@ -2,3 +2,4 @@ mkdocs
 mkdocs-material
 mkdocs-macros-plugin
 mike
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability