diff --git a/requirements.txt b/requirements.txt
index 949a24e..19f9d2e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ jupyter-nbextensions-configurator==0.4.1
 jupyterlab==1.2.0
 jupyterlab-server==1.0.6
 lazy-object-proxy==1.4.2
-lxml==4.6.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
 mistune==0.8.4