diff --git a/requirements.txt b/requirements.txt
index c7af86a..fad9f47 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -103,7 +103,7 @@ Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==2.1.2
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mock==3.0.5
 mpmath==1.0.0
 msgpack-python==0.5.1