diff --git a/requirements.txt b/requirements.txt
index 97e6a61..fd7cc9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ kiwisolver==1.1.0
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==7.2.0
 nbconvert==5.6.0
 nbformat==4.4.0