diff --git a/requirements.txt b/requirements.txt
index 79d8057..5e064a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ kiwisolver==1.1.0
 Mako==1.0.3
 MarkupSafe==0.23
 matplotlib==2.2.3
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.0.2
 nbconvert==5.6.1
 nbformat==4.4.0