diff --git a/requirements.txt b/requirements.txt
index 002655b..1f69475 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -42,7 +42,7 @@ kiwisolver==1.0.1
 Markdown==3.0.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 nbconvert==5.4.0
 nbformat==4.4.0