diff --git a/requirements.txt b/requirements.txt
index 608c663..8a7311a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ kiwisolver==1.1.0
 Markdown==3.2.1
 MarkupSafe==1.1.1
 matplotlib==3.1.3
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.1.0
 nbconvert==5.6.1
 nbformat==5.0.3