diff --git a/requirements.txt b/requirements.txt
index d18532c..fef47e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ lazy==1.4
 lazy-object-proxy==1.3.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==6.0.0
 nbconvert==5.4.1
 nbformat==4.4.0