diff --git a/requirements.txt b/requirements.txt
index 1bb3ef3..9078d12 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ Django==1.9
 django-allauth==0.34.0
 idna==2.6
 Jinja2==2.10
-lxml==4.1.1
+lxml==4.9.1
 MarkupSafe==1.0
 matplotlib==2.1.0
 nsepy==0.7