diff --git a/backend/requirements.txt b/backend/requirements.txt
index 3b417e53..e8969501 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -41,7 +41,7 @@ jsonschema==2.6.0
 Keras==2.2.0
 Keras-Applications==1.0.2
 Keras-Preprocessing==1.0.1
-lxml==4.2.4
+lxml==4.6.3
 Markdown==2.6.11
 MarkupSafe==1.0
 numpy==1.14.5