diff --git a/doc-requirements.txt b/doc-requirements.txt
index 22ecbb2b..28ee5654 100644
--- a/doc-requirements.txt
+++ b/doc-requirements.txt
@@ -1,4 +1,5 @@
 psutil
+defusedxml
 orjson
 reuse
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability