diff --git a/requirements.txt b/requirements.txt
index 4232311..b26a26d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 six
-lxml==3.6.0
+lxml==4.9.1
 Flask==0.12.3
 Flask-Admin>=1.4.2
 Flask-SQLAlchemy>=2.1