diff --git a/assignment1/requirements.txt b/assignment1/requirements.txt
old mode 100755
new mode 100644
index 4d9577c..aa0fefa
--- a/assignment1/requirements.txt
+++ b/assignment1/requirements.txt
@@ -29,7 +29,7 @@ kiwisolver==1.0.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
 mistune==0.8.4
-nbconvert==5.4.1
+nbconvert==6.3.0
 nbdime==1.0.5
 nbformat==4.4.0
 notebook==5.7.8