diff --git a/requirements.txt b/requirements.txt
index 9f8c815..acc77fe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 Markdown==3.1.1
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.0.2
 nbconvert==5.6.1
 nbformat==4.4.0