diff --git a/examples/clustering_users/clustering_requirements.txt b/examples/clustering_users/clustering_requirements.txt
index fc4304d..35cea45 100644
--- a/examples/clustering_users/clustering_requirements.txt
+++ b/examples/clustering_users/clustering_requirements.txt
@@ -31,7 +31,7 @@ mistune==0.8
 nbconvert==5.3.1
 nbformat==4.4.0
 nltk==3.2.5
-notebook==5.2.0
+notebook==6.4.10
 pandas==0.21.0
 pandocfilters==1.4.2
 parso==0.1.0