diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index f5cfe03122..364a300d23 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -55,7 +55,6 @@ import { MetaService } from '@/core/MetaService.js';
 import { SearchService } from '@/core/SearchService.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
 import { FunoutTimelineService } from '@/core/FunoutTimelineService.js';
-import { nyaize } from '@/misc/nyaize.js';
 import { UtilityService } from '@/core/UtilityService.js';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
diff --git a/packages/backend/src/core/entities/InstanceEntityService.ts b/packages/backend/src/core/entities/InstanceEntityService.ts
index 9afe87eab7..8bba150ece 100644
--- a/packages/backend/src/core/entities/InstanceEntityService.ts
+++ b/packages/backend/src/core/entities/InstanceEntityService.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Inject, Injectable } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import type { Packed } from '@/misc/json-schema.js';
 import type { MiInstance } from '@/models/Instance.js';
 import { MetaService } from '@/core/MetaService.js';
diff --git a/packages/backend/src/misc/nyaize.ts b/packages/backend/src/misc/nyaize.ts
deleted file mode 100644
index 0ac77e1006..0000000000
--- a/packages/backend/src/misc/nyaize.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and other misskey contributors
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-export function nyaize(text: string): string {
-	return text
-		// ja-JP
-		.replaceAll('な', 'にゃ').replaceAll('ナ', 'ニャ').replaceAll('ﾅ', 'ﾆｬ')
-		// en-US
-		.replace(/(?<=n)a/gi, x => x === 'A' ? 'YA' : 'ya')
-		.replace(/(?<=morn)ing/gi, x => x === 'ING' ? 'YAN' : 'yan')
-		.replace(/(?<=every)one/gi, x => x === 'ONE' ? 'NYAN' : 'nyan')
-		// ko-KR
-		.replace(/[나-낳]/g, match => String.fromCharCode(
-			match.charCodeAt(0)! + '냐'.charCodeAt(0) - '나'.charCodeAt(0),
-		))
-		.replace(/(다$)|(다(?=\.))|(다(?= ))|(다(?=!))|(다(?=\?))/gm, '다냥')
-		.replace(/(야(?=\?))|(야$)|(야(?= ))/gm, '냥');
-}
diff --git a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
index 2b31e6169c..96e1e94f7c 100644
--- a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
@@ -3,12 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import * as Redis from 'ioredis';
-import type { NotesRepository, UserListsRepository, UserListMembershipsRepository, MiNote } from '@/models/_.js';
+import type { NotesRepository, UserListsRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { QueryService } from '@/core/QueryService.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { DI } from '@/di-symbols.js';
@@ -67,9 +64,6 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
 	constructor(
-		@Inject(DI.redisForTimelines)
-		private redisForTimelines: Redis.Redis,
-
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,