diff --git a/requirements.txt b/requirements.txt
index cad7640..9fdc715 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ kiwisolver==1.0.1
 lxml==4.2.1
 MarkupSafe==1.0
 matplotlib==2.2.2
-mistune==0.8.3
+mistune==2.0.3
 more-itertools==4.1.0
 nbconvert==5.3.1
 nbformat==4.4.0