diff --git a/dendronet_legacy/requirements.txt b/dendronet_legacy/requirements.txt
index cda78a0..4bdad15 100644
--- a/dendronet_legacy/requirements.txt
+++ b/dendronet_legacy/requirements.txt
@@ -40,7 +40,7 @@ macaroonbakery==1.1.3
 Mako==1.0.7
 MarkupSafe==1.0
 matplotlib==2.1.1
-mistune==0.8.3
+mistune==2.0.3
 nbconvert==5.3.1
 nbformat==4.4.0
 netifaces==0.10.4