diff --git a/packages/backend/src/core/AccountUpdateService.ts b/packages/backend/src/core/AccountUpdateService.ts
index 5d1795819e..363a149316 100644
--- a/packages/backend/src/core/AccountUpdateService.ts
+++ b/packages/backend/src/core/AccountUpdateService.ts
@@ -16,7 +16,7 @@ import { bindThis } from '@/decorators.js';
 import type { PrivateKeyWithPem } from '@misskey-dev/node-http-message-signatures';
 
 @Injectable()
-export class AccountUpdateService {
+export class AccountUpdateService implements OnModuleInit {
 	private apDeliverManagerService: ApDeliverManagerService;
 	constructor(
 		private moduleRef: ModuleRef,
@@ -30,6 +30,10 @@ export class AccountUpdateService {
 	) {
 	}
 
+	async onModuleInit() {
+		this.apDeliverManagerService = this.moduleRef.get(ApDeliverManagerService.name);
+	}
+
 	private async createUpdatePersonActivity(user: MiLocalUser) {
 		return this.apRendererService.addContext(
 			this.apRendererService.renderUpdate(
diff --git a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
index 0aff31d0d1..9a6e7e73ef 100644
--- a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
+++ b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Inject, Injectable } from '@nestjs/common';
+import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
 import { IsNull, Not } from 'typeorm';
 import { DI } from '@/di-symbols.js';
 import type { FollowingsRepository } from '@/models/_.js';
@@ -17,6 +17,7 @@ import type Logger from '@/logger.js';
 import { UserKeypairService } from '../UserKeypairService.js';
 import { ApLoggerService } from './ApLoggerService.js';
 import type { PrivateKeyWithPem } from '@misskey-dev/node-http-message-signatures';
+import { ModuleRef } from '@nestjs/core';
 
 interface IRecipe {
 	type: string;
@@ -212,21 +213,27 @@ class DeliverManager {
 }
 
 @Injectable()
-export class ApDeliverManagerService {
+export class ApDeliverManagerService implements OnModuleInit {
 	private logger: Logger;
+	private accountUpdateService: AccountUpdateService;
 
 	constructor(
+		private moduleRef: ModuleRef,
+
 		@Inject(DI.followingsRepository)
 		private followingsRepository: FollowingsRepository,
 
 		private userKeypairService: UserKeypairService,
 		private queueService: QueueService,
-		private accountUpdateService: AccountUpdateService,
 		private apLoggerService: ApLoggerService,
 	) {
 		this.logger = this.apLoggerService.logger.createSubLogger('deliver-manager');
 	}
 
+	async onModuleInit() {
+		this.accountUpdateService = this.moduleRef.get(AccountUpdateService.name);
+	}
+
 	/**
 	 * Deliver activity to followers
 	 * @param actor
diff --git a/packages/backend/test/unit/UserSuspendService.ts b/packages/backend/test/unit/UserSuspendService.ts
index 6d69a8e5e1..d3b1a6a210 100644
--- a/packages/backend/test/unit/UserSuspendService.ts
+++ b/packages/backend/test/unit/UserSuspendService.ts
@@ -31,6 +31,7 @@ import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerServ
 import { RelayService } from '@/core/RelayService.js';
 import { ApLoggerService } from '@/core/activitypub/ApLoggerService.js';
 import { MiRemoteUser } from '@/models/User.js';
+import { UserKeypairService } from '@/core/UserKeypairService.js';
 
 function genHost() {
 	return randomString() + '.example.com';
@@ -47,6 +48,9 @@ describe('UserSuspendService', () => {
 	let globalEventService: jest.Mocked<GlobalEventService>;
 	let apRendererService: jest.Mocked<ApRendererService>;
 	let moderationLogService: jest.Mocked<ModerationLogService>;
+	let userKeypairService: jest.Mocked<UserKeypairService>;
+	let accountUpdateService: AccountUpdateService;
+	let apDeliverManagerService: ApDeliverManagerService;
 
 	async function createUser(data: Partial<MiUser> = {}): Promise<MiUser> {
 		const user = {
@@ -92,6 +96,14 @@ describe('UserSuspendService', () => {
 				UserSuspendService,
 				AccountUpdateService,
 				ApDeliverManagerService,
+				{
+					provide: AccountUpdateService.name,
+					useExisting: AccountUpdateService,
+				},
+				{
+					provide: ApDeliverManagerService.name,
+					useExisting: ApDeliverManagerService,
+				},
 				{
 					provide: UserEntityService,
 					useFactory: () => ({
@@ -145,6 +157,12 @@ describe('UserSuspendService', () => {
 						},
 					}),
 				},
+				{
+					provide: UserKeypairService,
+					useFactory: () => ({
+						refreshAndPrepareEd25519KeyPair: jest.fn(),
+					}),
+				}
 			],
 		}).compile();
 
@@ -159,6 +177,12 @@ describe('UserSuspendService', () => {
 		globalEventService = app.get<GlobalEventService>(GlobalEventService) as jest.Mocked<GlobalEventService>;
 		apRendererService = app.get<ApRendererService>(ApRendererService) as jest.Mocked<ApRendererService>;
 		moderationLogService = app.get<ModerationLogService>(ModerationLogService) as jest.Mocked<ModerationLogService>;
+		userKeypairService = app.get<UserKeypairService>(UserKeypairService) as jest.Mocked<UserKeypairService>;
+
+		apDeliverManagerService = app.get<ApDeliverManagerService>(ApDeliverManagerService);
+		await apDeliverManagerService.onModuleInit();
+		accountUpdateService = app.get<AccountUpdateService>(AccountUpdateService.name);
+		await accountUpdateService.onModuleInit();
 	});
 
 	beforeEach(() => {