diff --git a/requirements.txt b/requirements.txt
index 5499266..64e4c15 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -91,7 +91,7 @@ jupyter-client==6.1.7
 jupyter-core==4.6.3
 jupyterlab-pygments==0.1.2
 Keras-Preprocessing==1.1.2
-lxml==4.6.3
+lxml==4.9.1
 Markdown==3.2.2
 MarkupSafe==1.1.1
 mistune==0.8.4