diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 79490e8..e1c26f5
--- a/requirements.txt
+++ b/requirements.txt
@@ -69,7 +69,7 @@ matplotlib==3.0.3
 mccabe==0.6.1
 mistune==0.8.4
 mnist==0.2.2
-nbconvert==5.5.0
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.3
 nltk==3.4.5