diff --git a/docs/requirements.txt b/docs/requirements.txt
index 2f784ae..5af828a 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -26,3 +26,4 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.7
 sphinxcontrib-serializinghtml==1.1.10
 urllib3==2.2.1
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability