diff --git a/HW6/requirements.txt b/HW6/requirements.txt
index c3795a1..160bd12 100644
--- a/HW6/requirements.txt
+++ b/HW6/requirements.txt
@@ -20,7 +20,7 @@ mistune==0.7.4
 nbconvert==5.2.1
 nbformat==4.3.0
 networkx==1.11
-notebook==5.0.0
+notebook==6.4.12
 numpy==1.13.1
 olefile==0.44
 pandocfilters==1.4.1