diff --git a/requirements.txt b/requirements.txt
index b15c69b..4628a85 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 kiwisolver==1.0.1
 lazy-object-proxy==1.4.1
-lxml==4.3.4
+lxml==4.9.1
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.0.0