diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 24ff28e..f162737
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.2.2
 mistune==0.8.3
-nbconvert==5.3.1
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.1
 notebook==5.4.1