diff --git a/docs/requirements.txt b/docs/requirements.txt
index 07ab6a0..51f80cc 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
 sphinxcontrib-httpdomain==1.7.0
 mistyfy
 sphinx-autoapi
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability