diff --git a/packages/backend/src/core/AccountMoveService.ts b/packages/backend/src/core/AccountMoveService.ts
index b6b591d24036..07ae57675064 100644
--- a/packages/backend/src/core/AccountMoveService.ts
+++ b/packages/backend/src/core/AccountMoveService.ts
@@ -20,6 +20,7 @@ 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';
@@ -59,6 +60,7 @@ export class AccountMoveService {
 		private instanceChart: InstanceChart,
 		private metaService: MetaService,
 		private relayService: RelayService,
+		private cacheService: CacheService,
 		private queueService: QueueService,
 	) {
 	}
@@ -82,7 +84,7 @@ export class AccountMoveService {
 		Object.assign(src, update);
 
 		// Update cache
-		this.globalEventService.publishInternalEvent('localUserUpdated', src);
+		this.cacheService.uriPersonCache.set(srcUri, 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 d008e7ec52a3..0fc47bf8ec83 100644
--- a/packages/backend/src/core/CacheService.ts
+++ b/packages/backend/src/core/CacheService.ts
@@ -129,12 +129,10 @@ export class CacheService implements OnApplicationShutdown {
 			switch (type) {
 				case 'userChangeSuspendedState':
 				case 'userChangeDeletedState':
-				case 'remoteUserUpdated':
-				case 'localUserUpdated': {
+				case 'remoteUserUpdated': {
 					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 0f2e20feccd0..4044caaa5e69 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -215,7 +215,6 @@ 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 deeecdeb1f12..309aa5daad89 100644
--- a/packages/backend/src/core/UserFollowingService.ts
+++ b/packages/backend/src/core/UserFollowingService.ts
@@ -101,24 +101,33 @@ 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 follow(
+	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,
 		{ 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 d4154ca16a84..c6bb231d082f 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -189,10 +189,6 @@ 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;
@@ -207,10 +203,6 @@ 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 408b02fb380c..53dbb4216905 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.follow(job.data.from, job.data.to, {
+		await this.userFollowingService.followByThinUser(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/following/create.ts b/packages/backend/src/server/api/endpoints/following/create.ts
index db320e712981..042d7f119d3a 100644
--- a/packages/backend/src/server/api/endpoints/following/create.ts
+++ b/packages/backend/src/server/api/endpoints/following/create.ts
@@ -71,7 +71,7 @@ export const paramDef = {
 	type: 'object',
 	properties: {
 		userId: { type: 'string', format: 'misskey:id' },
-		withReplies: { type: 'boolean' },
+		withReplies: { type: 'boolean' }
 	},
 	required: ['userId'],
 } as const;
diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index 022e9645da63..ca95b7c9d5eb 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -461,9 +461,9 @@ 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);
-				this.globalEventService.publishInternalEvent('localUserUpdated', { id: user.id });
+			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 });
 			}
 
 			await this.userProfilesRepository.update(user.id, {