diff --git a/requirements.txt b/requirements.txt
index e097538..0a6276b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,7 +43,7 @@ kiwisolver==1.2.0
 Markdown==3.2.2
 MarkupSafe==1.1.1
 matplotlib==3.2.2
-mistune==0.8.4
+mistune==2.0.3
 monotonic==1.5
 mujoco-py==2.0.2.10
 nbconvert==5.6.1