diff --git a/requirements.txt b/requirements.txt
index 4ae8c73..ed7f56c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ hupper==1.3
 idna==2.7
 kombu==4.2.1
 legendarium==2.0.2
-lxml==4.2.3
+lxml==4.9.1
 Mako==1.0.7
 MarkupSafe==1.0
 PasteDeploy==1.5.2