diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0861831..806447e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -64,3 +64,4 @@ six==1.16.0
     # via python-dateutil
 watchdog==3.0.0
     # via mkdocs
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability