diff --git a/wordcloud_demo/requirements.txt b/wordcloud_demo/requirements.txt
index 8bc10c9..2163c31 100644
--- a/wordcloud_demo/requirements.txt
+++ b/wordcloud_demo/requirements.txt
@@ -34,7 +34,7 @@ jsonschema==2.6.0
 jupyter-client==5.2.0
 jupyter-core==4.4.0
 lazy-object-proxy==1.3.1
-lxml==4.1.1
+lxml==4.6.3
 Markdown==2.6.8
 MarkupSafe==1.0
 matplotlib==2.1.1