diff --git a/requirements.txt b/requirements.txt
index 8900d8b..66a418e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ idna==2.8
 itsdangerous==1.1.0
 Jinja2==2.10.3
 jsmin==2.2.2
-lxml==4.4.1
+lxml==4.6.3
 Mako==1.1.0
 MarkupSafe==1.1.1
 marshmallow==3.2.2