diff --git a/requirements.txt b/requirements.txt
index 1aef57b..9936b60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ Keras==2.2.5
 Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 kiwisolver==1.1.0
-lxml==4.4.1
+lxml==4.9.1
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1