diff --git a/requirements.txt b/requirements.txt
index 3bf928d..45ae91a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ black==22.8.0
 online-judge-tools==11.5.1
 
 # notebook
-ipykernel==6.16.0
+ipykernel==6.21.2
 
 # lib
 numpy==1.18.2