diff --git a/requirements.txt b/requirements.txt
index 7eed362..4d73812 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ Flask-Cors==3.0.6
 idna==2.7
 itsdangerous==0.24
 Jinja2==2.10
-lxml==4.2.3
+lxml==4.9.1
 MarkupSafe==1.0
 pycparser==2.18
 PyMySQL==0.9.2