diff --git a/requirements.txt b/requirements.txt
index 9d6fc0f..43c2057 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ flask-peewee==3.0.0
 html5lib==1.0.1
 itsdangerous==0.24
 Jinja2==2.10
-lxml==4.2.1
+lxml==4.9.1
 MarkupSafe==1.0
 mock==2.0.0
 pbr==4.0.2