diff --git a/Chapter-4/activity_2/requirements.txt b/Chapter-4/activity_2/requirements.txt
index 424e5fb..50d739e 100644
--- a/Chapter-4/activity_2/requirements.txt
+++ b/Chapter-4/activity_2/requirements.txt
@@ -41,7 +41,7 @@ mistune==0.8.3
 nbconvert==5.3.1
 nbformat==4.4.0
 nose==1.3.7
-notebook==5.2.2
+notebook==6.4.10
 numpy==1.13.3
 pandas==0.21.1
 pandocfilters==1.4.2