diff --git a/9_Machine_learning/3_OpenCV/dataset/observations-master/mask_classifier/requirements.txt b/9_Machine_learning/3_OpenCV/dataset/observations-master/mask_classifier/requirements.txt
index 99a8259..60f9cfd 100644
--- a/9_Machine_learning/3_OpenCV/dataset/observations-master/mask_classifier/requirements.txt
+++ b/9_Machine_learning/3_OpenCV/dataset/observations-master/mask_classifier/requirements.txt
@@ -54,7 +54,7 @@ murmurhash==1.0.2
 nbconvert==5.6.1
 nbformat==5.0.4
 networkx==2.4
-notebook==6.0.3
+notebook==6.1.5
 numexpr==2.7.1
 numpy==1.18.1
 olefile==0.46