diff --git a/requirements.txt b/requirements.txt
index f9e86e0..5b0edea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ lxml==4.2.1
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.2.2
-mistune==0.8.3
+mistune==2.0.3
 mock==2.0.0
 nbconvert==5.3.1
 nbformat==4.4.0