diff --git a/packages/backend/src/models/entities/Notification.ts b/packages/backend/src/models/entities/Notification.ts
index 0a2e9c2412f4..43c25e284cfa 100644
--- a/packages/backend/src/models/entities/Notification.ts
+++ b/packages/backend/src/models/entities/Notification.ts
@@ -65,8 +65,8 @@ export class Notification {
 	 * app - アプリ通知
 	 */
 	@Index()
-	@Column('enum', {
-		enum: notificationTypes,
+	@Column('varchar', {
+		length: 64,
 		comment: 'The type of the Notification.',
 	})
 	public type: typeof notificationTypes[number];
diff --git a/packages/backend/src/models/entities/UserProfile.ts b/packages/backend/src/models/entities/UserProfile.ts
index 60c1c55de5d3..bc655aa57bb1 100644
--- a/packages/backend/src/models/entities/UserProfile.ts
+++ b/packages/backend/src/models/entities/UserProfile.ts
@@ -201,13 +201,7 @@ export class UserProfile {
 	})
 	public mutedInstances: string[];
 
-	@Column('enum', {
-		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
-			...obsoleteNotificationTypes,
-		],
-		array: true,
+	@Column('jsonb', {
 		default: [],
 	})
 	public mutingNotificationTypes: typeof notificationTypes[number][];