diff --git a/assignment2/requirements.txt b/assignment2/requirements.txt
index 36879fc..24e5f1e 100644
--- a/assignment2/requirements.txt
+++ b/assignment2/requirements.txt
@@ -27,7 +27,7 @@ mistune==0.8.1
 nbconvert==4.1.0
 nbformat==4.0.1
 nltk==3.2.2
-notebook==5.7.8
+notebook==6.4.12
 numpy==1.12.1
 path.py==8.1.2
 pexpect==4.0.1