diff --git a/requirements/doc.txt b/requirements/doc.txt
index e654a1d83..2d5927c31 100644
--- a/requirements/doc.txt
+++ b/requirements/doc.txt
@@ -1,5 +1,5 @@
 Sphinx>=1.7.8
 sphinx-rtd-theme>=0.1.8
 cssselect>=1.0.3
-lxml==4.9.3
+lxml==4.9.4
 zope.testbrowser==6.0