diff --git a/requirements.txt b/requirements.txt
index 786b6e4..6a4c40f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ keyring==18.0.0
 lazy-object-proxy==1.4.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.5.0
 nbformat==4.4.0
 numpydoc==0.9.1