diff --git a/requirements.txt b/requirements.txt
index 2b5340c..1d6f8fb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ launchpadlib==1.10.6
 lazr.restfulclient==0.13.5
 lazr.uri==1.0.3
 lazy-object-proxy==1.4.3
-lxml==4.6.3
+lxml==4.9.1
 Mako==1.0.7
 Markdown==3.2.1
 MarkupSafe==1.0