diff --git a/requirements.txt b/requirements.txt
index 42bdbfe..bbd0cad 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -80,7 +80,7 @@ lxml==3.7.3
 Markdown==3.0.1
 MarkupSafe==1.0
 matplotlib==2.2.2
-mistune==0.8.3
+mistune==2.0.3
 mock==3.0.5
 more-itertools==7.0.0
 mpmath==1.0.0