diff --git a/Challenges/challenge_12_the_start_of_something_big/GregHilston/requirements.txt b/Challenges/challenge_12_the_start_of_something_big/GregHilston/requirements.txt
index cfba477..b2de3a5 100644
--- a/Challenges/challenge_12_the_start_of_something_big/GregHilston/requirements.txt
+++ b/Challenges/challenge_12_the_start_of_something_big/GregHilston/requirements.txt
@@ -22,7 +22,7 @@ kiwisolver==1.0.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2
 mistune==0.8.4
-nbconvert==5.4.0
+nbconvert==6.3.0
 nbformat==4.4.0
 notebook==5.7.0
 numpy==1.15.4