diff --git a/stateBox/useNotifications.tsx b/stateBox/useNotifications.tsx
index aae29f2..294ea60 100644
--- a/stateBox/useNotifications.tsx
+++ b/stateBox/useNotifications.tsx
@@ -36,29 +36,25 @@ async function registerForPushNotificationsAsync() {
   if (Platform.OS === "android") {
     Notifications.setNotificationChannelAsync("default", {
       name: "default",
-      groupId: "default",
-      importance: Notifications.AndroidImportance.MAX,
+      importance: Notifications.AndroidImportance.DEFAULT,
       vibrationPattern: [0, 250, 250, 250],
       lightColor: "#FF231F7C",
     });
     Notifications.setNotificationChannelAsync("運行情報", {
       name: "運行情報",
-      groupId: "運行情報",
-      importance: Notifications.AndroidImportance.MAX,
+      importance: Notifications.AndroidImportance.DEFAULT,
       vibrationPattern: [0, 250, 250, 250],
       lightColor: "#FF231F7C",
     });
     Notifications.setNotificationChannelAsync("遅延速報EX", {
       name: "遅延速報EX",
-      groupId: "遅延速報EX",
-      importance: Notifications.AndroidImportance.MAX,
+      importance: Notifications.AndroidImportance.LOW,
       vibrationPattern: [0, 250, 250, 250],
       lightColor: "#FF231F7C",
     });
     Notifications.setNotificationChannelAsync("怪レい列車BOT", {
       name: "怪レい列車BOT",
-      groupId: "怪レい列車BOT",
-      importance: Notifications.AndroidImportance.MAX,
+      importance: Notifications.AndroidImportance.LOW,
       vibrationPattern: [0, 250, 250, 250],
       lightColor: "#FF231F7C",
     });