diff --git a/packages/backend/src/core/CacheService.ts b/packages/backend/src/core/CacheService.ts
index 41ecc369cf..78bb4f70e9 100644
--- a/packages/backend/src/core/CacheService.ts
+++ b/packages/backend/src/core/CacheService.ts
@@ -161,16 +161,25 @@ export class CacheService implements OnApplicationShutdown {
 			switch (type) {
 				case 'userChangeSuspendedState':
 				case 'remoteUserUpdated': {
-					const user = await this.usersRepository.findOneByOrFail({ id: body.id });
-					this.userByIdCache.set(user.id, user);
-					for (const [k, v] of this.uriPersonCache.cache.entries()) {
-						if (v.value === user.id) {
-							this.uriPersonCache.set(k, user);
+					const user = await this.usersRepository.findOneBy({ id: body.id });
+					if (user == null) {
+						this.userByIdCache.delete(body.id);
+						for (const [k, v] of this.uriPersonCache.cache.entries()) {
+							if (v.value === body.id) {
+								this.uriPersonCache.delete(k);
+							}
+						}
+					} else {
+						this.userByIdCache.set(user.id, user);
+						for (const [k, v] of this.uriPersonCache.cache.entries()) {
+							if (v.value === user.id) {
+								this.uriPersonCache.set(k, user);
+							}
+						}
+						if (this.userEntityService.isLocalUser(user)) {
+							this.localUserByNativeTokenCache.set(user.token!, user);
+							this.localUserByIdCache.set(user.id, user);
 						}
-					}
-					if (this.userEntityService.isLocalUser(user)) {
-						this.localUserByNativeTokenCache.set(user.token!, user);
-						this.localUserByIdCache.set(user.id, user);
 					}
 					break;
 				}
diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index 6803def063..1cc54b6ff6 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -36,6 +36,7 @@ import { ApAudienceService } from './ApAudienceService.js';
 import { ApPersonService } from './models/ApPersonService.js';
 import { ApQuestionService } from './models/ApQuestionService.js';
 import { CacheService } from '@/core/CacheService.js';
+import { GlobalEventService } from '@/core/GlobalEventService.js';
 import type { Resolver } from './ApResolverService.js';
 import type { IAccept, IAdd, IAnnounce, IBlock, ICreate, IDelete, IFlag, IFollow, ILike, IObject, IReject, IRemove, IUndo, IUpdate, IMove } from './type.js';
 
@@ -84,6 +85,7 @@ export class ApInboxService {
 		private apQuestionService: ApQuestionService,
 		private queueService: QueueService,
 		private cacheService: CacheService,
+		private globalEventService: GlobalEventService,
 	) {
 		this.logger = this.apLoggerService.logger;
 	}
@@ -481,8 +483,7 @@ export class ApInboxService {
 			isDeleted: true,
 		});
 
-		this.cacheService.uriPersonCache.delete(actor.uri);
-		this.cacheService.userByIdCache.delete(actor.id);
+		this.globalEventService.publishInternalEvent('remoteUserUpdated', { id: actor.id });
 
 		return `ok: queued ${job.name} ${job.id}`;
 	}