diff --git a/requirements.txt b/requirements.txt
index 2d32197..2907605 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ Keras==2.3.1
 Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 kiwisolver==1.2.0
-lxml==4.5.0
+lxml==4.9.1
 Mako==1.1.2
 Markdown==3.1.1
 MarkupSafe==1.1.1