diff --git a/wordcloud_demo/requirements.txt b/wordcloud_demo/requirements.txt
index 8bc10c9..38547db 100644
--- a/wordcloud_demo/requirements.txt
+++ b/wordcloud_demo/requirements.txt
@@ -39,7 +39,7 @@ Markdown==2.6.8
 MarkupSafe==1.0
 matplotlib==2.1.1
 mccabe==0.6.1
-mistune==0.8.3
+mistune==2.0.3
 mysqlclient==1.3.10
 nbconvert==5.3.1
 nbformat==4.4.0