diff --git a/odoo_requirements.txt b/odoo_requirements.txt
index b91509a..7e94855 100644
--- a/odoo_requirements.txt
+++ b/odoo_requirements.txt
@@ -10,7 +10,7 @@ gevent==1.1.2
 greenlet==0.4.10
 jcconv==0.2.3
 Jinja2==2.8
-lxml==3.6.1
+lxml==4.9.1
 Mako==1.0.4
 MarkupSafe==0.23
 mock==2.0.0