diff --git a/backend/requirements.txt b/backend/requirements.txt
index cacef69..9b61b69 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -19,7 +19,7 @@ incremental==17.5.0
 ipython==6.2.1
 ipython-genutils==0.2.0
 jedi==0.11.1
-lxml==4.1.1
+lxml==4.9.1
 Markdown==2.6.11
 mysqlclient==1.3.12
 nltk==3.2.5