diff --git a/wordcloud_demo/requirements.txt b/wordcloud_demo/requirements.txt
index 8bc10c9..5d8c350 100644
--- a/wordcloud_demo/requirements.txt
+++ b/wordcloud_demo/requirements.txt
@@ -41,7 +41,7 @@ matplotlib==2.1.1
 mccabe==0.6.1
 mistune==0.8.3
 mysqlclient==1.3.10
-nbconvert==5.3.1
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.0
 numpy==1.13.3