diff --git a/requirements.txt b/requirements.txt
index 4223ed5..74457d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -94,7 +94,7 @@ lxml==4.5.0
 MarkupSafe==1.1.1
 matplotlib==3.1.3
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mock==4.0.1
 more-itertools==8.2.0
 mpmath==1.1.0