diff --git a/packages/backend/migration/1676434944993-drop-group.js b/packages/backend/migration/1676434944993-drop-group.js
index 043db83b0..bdf3c1034 100644
--- a/packages/backend/migration/1676434944993-drop-group.js
+++ b/packages/backend/migration/1676434944993-drop-group.js
@@ -15,21 +15,9 @@ export class dropGroup1676434944993 {
         await queryRunner.query(`ALTER TABLE "notification" ALTER COLUMN "type" TYPE "public"."notification_type_enum" USING "type"::"text"::"public"."notification_type_enum"`);
         await queryRunner.query(`DROP TYPE "public"."notification_type_enum_old"`);
         await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "emailNotificationTypes" SET DEFAULT '["follow","receiveFollowRequest"]'`);
-        await queryRunner.query(`ALTER TYPE "public"."user_profile_mutingnotificationtypes_enum" RENAME TO "user_profile_mutingnotificationtypes_enum_old"`);
-        await queryRunner.query(`CREATE TYPE "public"."user_profile_mutingnotificationtypes_enum" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'achievementEarned', 'app')`);
-        await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" DROP DEFAULT`);
-        await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" TYPE "public"."user_profile_mutingnotificationtypes_enum"[] USING "mutingNotificationTypes"::"text"::"public"."user_profile_mutingnotificationtypes_enum"[]`);
-        await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" SET DEFAULT '{}'`);
-        await queryRunner.query(`DROP TYPE "public"."user_profile_mutingnotificationtypes_enum_old"`);
     }
 
     async down(queryRunner) {
-        await queryRunner.query(`CREATE TYPE "public"."user_profile_mutingnotificationtypes_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'achievementEarned', 'app')`);
-        await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" DROP DEFAULT`);
-        await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" TYPE "public"."user_profile_mutingnotificationtypes_enum_old"[] USING "mutingNotificationTypes"::"text"::"public"."user_profile_mutingnotificationtypes_enum_old"[]`);
-        await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" SET DEFAULT '{}'`);
-        await queryRunner.query(`DROP TYPE "public"."user_profile_mutingnotificationtypes_enum"`);
-        await queryRunner.query(`ALTER TYPE "public"."user_profile_mutingnotificationtypes_enum_old" RENAME TO "user_profile_mutingnotificationtypes_enum"`);
         await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "emailNotificationTypes" SET DEFAULT '["follow", "receiveFollowRequest", "groupInvited"]'`);
         await queryRunner.query(`CREATE TYPE "public"."notification_type_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'achievementEarned', 'app')`);
         await queryRunner.query(`ALTER TABLE "notification" ALTER COLUMN "type" TYPE "public"."notification_type_enum_old" USING "type"::"text"::"public"."notification_type_enum_old"`);
diff --git a/packages/backend/src/models/entities/UserProfile.ts b/packages/backend/src/models/entities/UserProfile.ts
index 029395ac3..3d35b4cb5 100644
--- a/packages/backend/src/models/entities/UserProfile.ts
+++ b/packages/backend/src/models/entities/UserProfile.ts
@@ -202,7 +202,11 @@ export class UserProfile {
 	public mutedInstances: string[];
 
 	@Column('enum', {
-		enum: notificationTypes,
+		enum: [ 
+			...notificationTypes,
+			// マイグレーションで削除が困難なので古いenumは残しておく
+			'groupInvited',
+		],
 		array: true,
 		default: [],
 	})