diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 5805dda..5b9db04
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@ kombu==4.3.0
 MarkupSafe==1.1.0
 mistune==0.8.4
 mysqlclient==1.4.1
-nbconvert==5.4.0
+nbconvert==6.3.0
 nbformat==4.4.0
 nose==1.3.7
 notebook==5.7.4