diff --git a/packages/backend/src/core/AccountUpdateService.ts b/packages/backend/src/core/AccountUpdateService.ts
index 69a57b4854..4c89f3a048 100644
--- a/packages/backend/src/core/AccountUpdateService.ts
+++ b/packages/backend/src/core/AccountUpdateService.ts
@@ -27,15 +27,22 @@ export class AccountUpdateService {
 	}
 
 	@bindThis
-	public async publishToFollowers(userId: MiUser['id']) {
+	/**
+	 * ユーザーのアップデートをフォロワーに配信する
+	 * @param userId ユーザーID
+	 * @param isKeyUpdation Ed25519キーの作成など公開鍵のアップデートによる呼び出しか？ trueにするとメインキーを使うようになる
+	 */
+	public async publishToFollowers(userId: MiUser['id'], isKeyUpdation: boolean = false) {
 		const user = await this.usersRepository.findOneBy({ id: userId });
 		if (user == null) throw new Error('user not found');
 
 		// フォロワーがリモートユーザーかつ投稿者がローカルユーザーならUpdateを配信
 		if (this.userEntityService.isLocalUser(user)) {
 			const content = this.apRendererService.addContext(this.apRendererService.renderUpdate(await this.apRendererService.renderPerson(user), user));
-			this.apDeliverManagerService.deliverToFollowers(user, content);
-			this.relayService.deliverToRelays(user, content);
+			await Promise.allSettled([
+				this.apDeliverManagerService.deliverToFollowers(user, content, isKeyUpdation),
+				this.relayService.deliverToRelays(user, content, isKeyUpdation),
+			]);
 		}
 	}
 }
diff --git a/packages/backend/src/core/QueueService.ts b/packages/backend/src/core/QueueService.ts
index 6177aba32e..cb5dca2d39 100644
--- a/packages/backend/src/core/QueueService.ts
+++ b/packages/backend/src/core/QueueService.ts
@@ -70,7 +70,7 @@ export class QueueService {
 	}
 
 	@bindThis
-	public async deliver(user: ThinUser, content: IActivity | null, to: string | null, isSharedInbox: boolean) {
+	public async deliver(user: ThinUser, content: IActivity | null, to: string | null, isSharedInbox: boolean, forceMainKey?: boolean) {
 		if (content == null) return null;
 		if (to == null) return null;
 
@@ -84,6 +84,7 @@ export class QueueService {
 			digest: await genRFC3230DigestHeader(contentBody, 'SHA-256'),
 			to,
 			isSharedInbox,
+			forceMainKey,
 		};
 
 		return this.deliverQueue.add(to, data, {
@@ -101,10 +102,11 @@ export class QueueService {
 	 * @param user `{ id: string; }` この関数ではThinUserに変換しないので前もって変換してください
 	 * @param content IActivity | null
 	 * @param inboxes `Map<string, boolean>` / key: to (inbox url), value: isSharedInbox (whether it is sharedInbox)
+	 * @param forceMainKey boolean | undefined, force to use main (rsa) key
 	 * @returns void
 	 */
 	@bindThis
-	public async deliverMany(user: ThinUser, content: IActivity | null, inboxes: Map<string, boolean>) {
+	public async deliverMany(user: ThinUser, content: IActivity | null, inboxes: Map<string, boolean>, forceMainKey?: boolean) {
 		if (content == null) return null;
 		const contentBody = JSON.stringify(content);
 
@@ -124,6 +126,7 @@ export class QueueService {
 				content: contentBody,
 				to: d[0],
 				isSharedInbox: d[1],
+				forceMainKey,
 			} as DeliverJobData,
 			opts,
 		})));
diff --git a/packages/backend/src/core/RelayService.ts b/packages/backend/src/core/RelayService.ts
index e9dc9b57af..52bf5d8e6a 100644
--- a/packages/backend/src/core/RelayService.ts
+++ b/packages/backend/src/core/RelayService.ts
@@ -111,7 +111,7 @@ export class RelayService {
 	}
 
 	@bindThis
-	public async deliverToRelays(user: { id: MiUser['id']; host: null; }, activity: any): Promise<void> {
+	public async deliverToRelays(user: { id: MiUser['id']; host: null; }, activity: any, forceMainKey?: boolean): Promise<void> {
 		if (activity == null) return;
 
 		const relays = await this.relaysCache.fetch(() => this.relaysRepository.findBy({
@@ -125,7 +125,7 @@ export class RelayService {
 		const signed = await this.apRendererService.attachLdSignature(copy, user);
 
 		for (const relay of relays) {
-			this.queueService.deliver(user, signed, relay.inbox, false);
+			this.queueService.deliver(user, signed, relay.inbox, false, forceMainKey);
 		}
 	}
 }
diff --git a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
index cd3b6a8795..cf3dce465e 100644
--- a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
+++ b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
@@ -13,6 +13,7 @@ import { bindThis } from '@/decorators.js';
 import type { IActivity } from '@/core/activitypub/type.js';
 import { ThinUser } from '@/queue/types.js';
 import { UserKeypairService } from '../UserKeypairService.js';
+import { AccountUpdateService } from '@/core/AccountUpdateService.js';
 
 interface IRecipe {
 	type: string;
@@ -50,6 +51,7 @@ class DeliverManager {
 		private userKeypairService: UserKeypairService,
 		private followingsRepository: FollowingsRepository,
 		private queueService: QueueService,
+		private accountUpdateService: AccountUpdateService,
 
 		actor: { id: MiUser['id']; host: null; },
 		activity: IActivity | null,
@@ -104,12 +106,16 @@ class DeliverManager {
 	 * Execute delivers
 	 */
 	@bindThis
-	public async execute(): Promise<void> {
+	public async execute(opts?: { forceMainKey?: boolean }): Promise<void> {
 		//#region MIGRATION
-		/**
-		 * ed25519の署名がなければ追加する
-		 */
-		await this.userKeypairService.refreshAndprepareEd25519KeyPair(this.actor.id);
+		if (opts?.forceMainKey !== true) {
+			/**
+			 * ed25519の署名がなければ追加する
+			 */
+			await this.userKeypairService.refreshAndprepareEd25519KeyPair(this.actor.id);
+			// リモートに配信
+			await this.accountUpdateService.publishToFollowers(this.actor.id, true);
+		}
 		//#endregion
 
 		// The value flags whether it is shared or not.
@@ -163,6 +169,7 @@ export class ApDeliverManagerService {
 
 		private userKeypairService: UserKeypairService,
 		private queueService: QueueService,
+		private accountUpdateService: AccountUpdateService,
 	) {
 	}
 
@@ -170,18 +177,20 @@ export class ApDeliverManagerService {
 	 * Deliver activity to followers
 	 * @param actor
 	 * @param activity Activity
+	 * @param forceMainKey Force to use main (rsa) key
 	 */
 	@bindThis
-	public async deliverToFollowers(actor: { id: MiLocalUser['id']; host: null; }, activity: IActivity): Promise<void> {
+	public async deliverToFollowers(actor: { id: MiLocalUser['id']; host: null; }, activity: IActivity, forceMainKey?: boolean): Promise<void> {
 		const manager = new DeliverManager(
 			this.userKeypairService,
 			this.followingsRepository,
 			this.queueService,
+			this.accountUpdateService,
 			actor,
 			activity,
 		);
 		manager.addFollowersRecipe();
-		await manager.execute();
+		await manager.execute({ forceMainKey });
 	}
 
 	/**
@@ -196,6 +205,7 @@ export class ApDeliverManagerService {
 			this.userKeypairService,
 			this.followingsRepository,
 			this.queueService,
+			this.accountUpdateService,
 			actor,
 			activity,
 		);
@@ -209,7 +219,7 @@ export class ApDeliverManagerService {
 			this.userKeypairService,
 			this.followingsRepository,
 			this.queueService,
-
+			this.accountUpdateService,
 			actor,
 			activity,
 		);
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index 6c58bee211..132593679e 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -91,11 +91,16 @@ export class ApRequestService {
 		this.logger = this.loggerService?.getLogger('ap-request'); // なぜか TypeError: Cannot read properties of undefined (reading 'getLogger') と言われる
 	}
 
+	/**
+	 * Get private key by user id and implementation level
+	 * @param userId User id
+	 * @param level Implementation level
+	 */
 	@bindThis
 	private async getPrivateKey(userId: MiUser['id'], level: string): Promise<PrivateKey> {
 		const keypair = await this.userKeypairService.getUserKeypair(userId);
 
-		return (level !== '00' && keypair.ed25519PrivateKey) ? {
+		return (level !== '00' && level !== '10' && keypair.ed25519PrivateKey) ? {
 			privateKeyPem: keypair.ed25519PrivateKey,
 			keyId: `${this.config.url}/users/${userId}#ed25519-key`,
 		} : {
diff --git a/packages/backend/src/queue/processors/DeliverProcessorService.ts b/packages/backend/src/queue/processors/DeliverProcessorService.ts
index 8f3782a048..2a4dd5f997 100644
--- a/packages/backend/src/queue/processors/DeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeliverProcessorService.ts
@@ -76,7 +76,16 @@ export class DeliverProcessorService {
 			await this.fetchInstanceMetadataService.fetchInstanceMetadata(_server).then(() => {});
 			const server = await this.federatedInstanceService.fetch(host);
 
-			await this.apRequestService.signedPost(job.data.user, job.data.to, job.data.content, server.httpMessageSignaturesImplementationLevel, job.data.digest);
+			/**
+			 * RSAキーを強制するかでレベルを変える
+			 */
+			const level = job.data.forceMainKey ?
+				server.httpMessageSignaturesImplementationLevel === '11' ?
+					'10' :
+					'00'
+				: server.httpMessageSignaturesImplementationLevel;
+
+			await this.apRequestService.signedPost(job.data.user, job.data.to, job.data.content, level, job.data.digest);
 
 			// Update stats
 			if (server.isNotResponding) {
diff --git a/packages/backend/src/queue/types.ts b/packages/backend/src/queue/types.ts
index 135bccb60c..74e0c0a66e 100644
--- a/packages/backend/src/queue/types.ts
+++ b/packages/backend/src/queue/types.ts
@@ -38,6 +38,8 @@ export type DeliverJobData = {
 	to: string;
 	/** whether it is sharedInbox */
 	isSharedInbox: boolean;
+	/** force to use main (rsa) key */
+	forceMainKey?: boolean;
 };
 
 export type InboxJobData = {