diff --git a/Chapter-4/activity_2/requirements.txt b/Chapter-4/activity_2/requirements.txt
index 424e5fb..e6320e7 100644
--- a/Chapter-4/activity_2/requirements.txt
+++ b/Chapter-4/activity_2/requirements.txt
@@ -38,7 +38,7 @@ Markdown==2.6.10
 MarkupSafe==1.0
 matplotlib==2.1.0
 mistune==0.8.3
-nbconvert==5.3.1
+nbconvert==6.5.1
 nbformat==4.4.0
 nose==1.3.7
 notebook==5.2.2