diff --git a/requirements.txt b/requirements.txt
index 47c6fc4..23f06e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ markdown-include==0.7.0
 mkdocs-git-revision-date-localized-plugin==1.1.0
 mkdocs-macros-plugin==0.7.0
 mkdocs-with-pdf==0.9.3
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability