diff --git a/packages/backend/src/core/AccountMoveService.ts b/packages/backend/src/core/AccountMoveService.ts
index e88d29b63c..774d80f8c3 100644
--- a/packages/backend/src/core/AccountMoveService.ts
+++ b/packages/backend/src/core/AccountMoveService.ts
@@ -21,7 +21,6 @@ import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
 import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
-import { CacheService } from '@/core/CacheService.js';
 import { ProxyAccountService } from '@/core/ProxyAccountService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { MetaService } from '@/core/MetaService.js';
@@ -61,7 +60,6 @@ export class AccountMoveService {
 		private instanceChart: InstanceChart,
 		private metaService: MetaService,
 		private relayService: RelayService,
-		private cacheService: CacheService,
 		private queueService: QueueService,
 	) {
 	}
@@ -85,7 +83,7 @@ export class AccountMoveService {
 		Object.assign(src, update);
 
 		// Update cache
-		this.cacheService.uriPersonCache.set(srcUri, src);
+		this.globalEventService.publishInternalEvent('localUserUpdated', src);
 
 		const srcPerson = await this.apRendererService.renderPerson(src);
 		const updateAct = this.apRendererService.addContext(this.apRendererService.renderUpdate(srcPerson, src));
diff --git a/packages/backend/src/core/CacheService.ts b/packages/backend/src/core/CacheService.ts
index 0fc47bf8ec..d008e7ec52 100644
--- a/packages/backend/src/core/CacheService.ts
+++ b/packages/backend/src/core/CacheService.ts
@@ -129,10 +129,12 @@ export class CacheService implements OnApplicationShutdown {
 			switch (type) {
 				case 'userChangeSuspendedState':
 				case 'userChangeDeletedState':
-				case 'remoteUserUpdated': {
+				case 'remoteUserUpdated':
+				case 'localUserUpdated': {
 					const user = await this.usersRepository.findOneBy({ id: body.id });
 					if (user == null) {
 						this.userByIdCache.delete(body.id);
+						this.localUserByIdCache.delete(body.id);
 						for (const [k, v] of this.uriPersonCache.cache.entries()) {
 							if (v.value?.id === body.id) {
 								this.uriPersonCache.delete(k);
diff --git a/packages/backend/src/core/GlobalEventService.ts b/packages/backend/src/core/GlobalEventService.ts
index a127a6df3b..7c1b34da05 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -212,6 +212,7 @@ export interface InternalEventTypes {
 	userChangeDeletedState: { id: MiUser['id']; isDeleted: MiUser['isDeleted']; };
 	userTokenRegenerated: { id: MiUser['id']; oldToken: string; newToken: string; };
 	remoteUserUpdated: { id: MiUser['id']; };
+	localUserUpdated: { id: MiUser['id']; };
 	follow: { followerId: MiUser['id']; followeeId: MiUser['id']; };
 	unfollow: { followerId: MiUser['id']; followeeId: MiUser['id']; };
 	blockingCreated: { blockerId: MiUser['id']; blockeeId: MiUser['id']; };
diff --git a/packages/backend/src/core/UserFollowingService.ts b/packages/backend/src/core/UserFollowingService.ts
index 6821aae788..8e1e5c530c 100644
--- a/packages/backend/src/core/UserFollowingService.ts
+++ b/packages/backend/src/core/UserFollowingService.ts
@@ -100,33 +100,24 @@ export class UserFollowingService implements OnModuleInit {
 		this.queueService.deliver(followee, content, follower.inbox, false);
 	}
 
-	/**
-	 * ThinUserでなくともユーザーの情報が最新でない場合はこちらを使うべき
-	 */
-	@bindThis
-	public async followByThinUser(
-		_follower: ThinUser,
-		_followee: ThinUser,
-		options: Parameters<typeof this.follow>[2] = {},
-	) {
-		const [follower, followee] = await Promise.all([
-			this.usersRepository.findOneByOrFail({ id: _follower.id }),
-			this.usersRepository.findOneByOrFail({ id: _followee.id }),
-		]) as [MiLocalUser | MiRemoteUser, MiLocalUser | MiRemoteUser];
-
-		await this.follow(follower, followee, options);
-	}
-
 	@bindThis
 	public async follow(
-		follower: MiLocalUser | MiRemoteUser,
-		followee: MiLocalUser | MiRemoteUser,
+		_follower: ThinUser,
+		_followee: ThinUser,
 		{ requestId, silent = false, withReplies }: {
 			requestId?: string,
 			silent?: boolean,
 			withReplies?: boolean,
 		} = {},
 	): Promise<void> {
+		/**
+		 * 必ず最新のユーザー情報を取得する
+		 */
+		const [follower, followee] = await Promise.all([
+			this.usersRepository.findOneByOrFail({ id: _follower.id }),
+			this.usersRepository.findOneByOrFail({ id: _followee.id }),
+		]) as [MiLocalUser | MiRemoteUser, MiLocalUser | MiRemoteUser];
+
 		if (this.userEntityService.isRemoteUser(follower) && this.userEntityService.isRemoteUser(followee)) {
 			// What?
 			throw new Error('Remote user cannot follow remote user.');
diff --git a/packages/backend/src/misc/cache.ts b/packages/backend/src/misc/cache.ts
index b5ffe76fda..71f7b838a8 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -193,6 +193,10 @@ export class RedisSingleCache<T> {
 // TODO: メモリ節約のためあまり参照されないキーを定期的に削除できるようにする？
 
 export class MemoryKVCache<T> {
+	/**
+	 * データを持つマップ
+	 * @deprecated これを直接操作するべきではない
+	 */
 	public cache: Map<string, { date: number; value: T; }>;
 	private lifetime: number;
 	private gcIntervalHandle: NodeJS.Timeout;
@@ -207,6 +211,10 @@ export class MemoryKVCache<T> {
 	}
 
 	@bindThis
+	/**
+	 * Mapにキャッシュをセットします
+	 * @deprecated これを直接呼び出すべきではない。InternalEventなどで変更を全てのプロセス/マシンに通知するべき
+	 */
 	public set(key: string, value: T): void {
 		this.cache.set(key, {
 			date: Date.now(),
diff --git a/packages/backend/src/queue/processors/RelationshipProcessorService.ts b/packages/backend/src/queue/processors/RelationshipProcessorService.ts
index 36f3ced94f..99f4897a1c 100644
--- a/packages/backend/src/queue/processors/RelationshipProcessorService.ts
+++ b/packages/backend/src/queue/processors/RelationshipProcessorService.ts
@@ -35,7 +35,7 @@ export class RelationshipProcessorService {
 	@bindThis
 	public async processFollow(job: Bull.Job<RelationshipJobData>): Promise<string> {
 		this.logger.info(`${job.data.from.id} is trying to follow ${job.data.to.id} ${job.data.withReplies ? 'with replies' : 'without replies'}`);
-		await this.userFollowingService.followByThinUser(job.data.from, job.data.to, {
+		await this.userFollowingService.follow(job.data.from, job.data.to, {
 			requestId: job.data.requestId,
 			silent: job.data.silent,
 			withReplies: job.data.withReplies,
diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index 529a4ea65c..5e64511f72 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -443,9 +443,9 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			this.hashtagService.updateUsertags(user, tags);
 			//#endregion
 
-			if (Object.keys(updates).length > 0) await this.usersRepository.update(user.id, updates);
-			if (Object.keys(updates).includes('alsoKnownAs')) {
-				this.cacheService.uriPersonCache.set(this.userEntityService.genLocalUserUri(user.id), { ...user, ...updates });
+			if (Object.keys(updates).length > 0) {
+				await this.usersRepository.update(user.id, updates);
+				this.globalEventService.publishInternalEvent('localUserUpdated', { id: user.id });
 			}
 
 			await this.userProfilesRepository.update(user.id, {