diff --git a/requirements.txt b/requirements.txt
index 9e25634..7cc69a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -65,7 +65,7 @@ LunarCalendar==0.0.9
 lxml==4.5.0
 MarkupSafe==1.1.1
 matplotlib==3.2.1
-mistune==0.8.4
+mistune==2.0.3
 multidict==4.7.3
 nbconvert==5.6.1
 nbformat==5.0.6