diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index eedfbfd..544580f
--- a/requirements.txt
+++ b/requirements.txt
@@ -111,7 +111,7 @@ msgpack==0.6.1
 multipledispatch==0.6.0
 murmurhash==1.0.2
 navigator-updater==0.2.1
-nbconvert==5.6.0
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.3
 neuralcoref==4.0