diff --git a/requirements.txt b/requirements.txt
index cfea8ed..1fed0df 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ ipython-genutils==0.2.0
 ipywidgets==7.5.1
 Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
-lxml==4.2.1
+lxml==4.9.1
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1