diff --git a/requirements.txt b/requirements.txt
index b03b63b..0ee919d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ 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
 numpy==1.18.0
 pandas==0.25.3