diff --git a/Lecture5/requirements.txt b/Lecture5/requirements.txt
index 70bab6d..aacf381 100644
--- a/Lecture5/requirements.txt
+++ b/Lecture5/requirements.txt
@@ -27,7 +27,7 @@ mistune==0.8.4
 more-itertools==8.1.0
 nbconvert==5.6.1
 nbformat==5.0.4
-notebook==6.0.3
+notebook==6.4.10
 numpy==1.17.5
 pandocfilters==1.4.2
 parso==0.6.0