diff --git a/requirements.txt b/requirements.txt
index 69e2090..6b3c651 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -64,7 +64,7 @@ lxml==4.3.4
 Markdown==3.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 mpmath==1.1.0
 nbconvert==5.4.1