diff --git a/Surrogate_MBO/requirements.txt b/Surrogate_MBO/requirements.txt
index 3b02b4b..9936385 100644
--- a/Surrogate_MBO/requirements.txt
+++ b/Surrogate_MBO/requirements.txt
@@ -72,7 +72,7 @@ multidict==4.7.5
 multipledispatch==0.6.0
 nbconvert==5.6.1
 nbformat==5.0.6
-notebook==6.1.5
+notebook==6.4.1
 numpy==1.18.1
 oauthlib==3.1.0
 opencv-python==4.1.1.26