diff --git a/Code of Winning Methods/A4/kaggle-m5a-4th/requirements.txt b/Code of Winning Methods/A4/kaggle-m5a-4th/requirements.txt
index 48a8acf..eb8970b 100644
--- a/Code of Winning Methods/A4/kaggle-m5a-4th/requirements.txt	
+++ b/Code of Winning Methods/A4/kaggle-m5a-4th/requirements.txt	
@@ -34,7 +34,7 @@ matplotlib==3.2.2
 mistune==0.8.4
 nbconvert==5.6.1
 nbformat==5.0.7
-notebook==6.0.3
+notebook==6.4.12
 numpy==1.19.0
 optuna==1.5.0
 packaging==20.4; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
@@ -116,7 +116,7 @@ matplotlib==3.2.2
 mistune==0.8.4
 nbconvert==5.6.1
 nbformat==5.0.7
-notebook==6.0.3
+notebook==6.4.12
 numpy==1.19.0
 optuna==1.5.0
 packaging==20.4; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'