diff --git a/docs/requirements.txt b/docs/requirements.txt
index 2e2ad45..d06cd86 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,3 +4,4 @@ sphinx-issues
 sphinx_rtd_theme
 readthedocs-sphinx-ext
 sphinx-autoapi
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability