diff --git a/requirements.txt b/requirements.txt
index 564f01e..70aaff9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ gunicorn==20.0.4
 idna==2.8
 itsdangerous==1.1.0
 Jinja2==2.10.3
-lxml==4.4.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 promise==2.2.1
 python-dateutil==2.8.1