diff --git a/requirements.txt b/requirements.txt
index c789c41..01bca2a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.2
 kiwisolver==1.1.0
 kombu==4.6.11
-lxml==4.6.1
+lxml==4.9.1
 Mako==1.1.0
 Markdown==3.3.3
 MarkupSafe==1.1.1