diff --git a/requirements.txt b/requirements.txt
index e8853f8..1966827 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ jupyter-console==6.0.0
 jupyter-core==4.4.0
 jupyterlab==0.35.4
 jupyterlab-server==0.2.0
-lxml==4.3.3
+lxml==4.6.5
 MarkupSafe==1.1.1
 mistune==0.8.4
 msgpack==0.5.6