diff --git a/requirements.txt b/requirements.txt
index 89e63c1..8775e8c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ kiwisolver==1.0.1
 Markdown==3.0.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2
-mistune==0.8.4
+mistune==2.0.3
 mlagents==0.6.0
 more-itertools==5.0.0
 nbconvert==5.4.0