diff --git a/dendronet_legacy/requirements.txt b/dendronet_legacy/requirements.txt
index cda78a0..97d88ea 100644
--- a/dendronet_legacy/requirements.txt
+++ b/dendronet_legacy/requirements.txt
@@ -41,7 +41,7 @@ Mako==1.0.7
 MarkupSafe==1.0
 matplotlib==2.1.1
 mistune==0.8.3
-nbconvert==5.3.1
+nbconvert==6.5.1
 nbformat==4.4.0
 netifaces==0.10.4
 nose==1.3.7