diff --git a/webapp/templates/requirements.txt b/webapp/templates/requirements.txt
index c9e8264..f7f1164 100644
--- a/webapp/templates/requirements.txt
+++ b/webapp/templates/requirements.txt
@@ -7,7 +7,7 @@ WTForms==2.0.1
 Werkzeug==0.15.3
 cssselect==0.9.1
 itsdangerous==0.24
-lxml==3.4.1
+lxml==4.9.1
 nltk==3.4.5
 numpy==1.9.1
 scikit-learn==0.15.2