diff --git a/packages/backend/src/core/UserKeypairService.ts b/packages/backend/src/core/UserKeypairService.ts
index c27f8fc71a..2341976068 100644
--- a/packages/backend/src/core/UserKeypairService.ts
+++ b/packages/backend/src/core/UserKeypairService.ts
@@ -49,17 +49,26 @@ export class UserKeypairService implements OnApplicationShutdown {
 		return await this.cache.refresh(userId);
 	}
 
+	/**
+	 *
+	 * @param userId user id
+	 * @returns Promise<boolean> true if keypair is created, false if keypair is already exists
+	 */
 	@bindThis
-	public async refreshAndprepareEd25519KeyPair(userId: MiUser['id']): Promise<void> {
+	public async refreshAndprepareEd25519KeyPair(userId: MiUser['id']): Promise<boolean> {
 		await this.refresh(userId);
 		const keypair = await this.cache.fetch(userId);
-		if (keypair.ed25519PublicKey != null) return;
+		if (keypair.ed25519PublicKey != null) {
+			return false;
+		}
+
 		const ed25519 = await genEd25519KeyPair();
 		await this.userKeypairsRepository.update({ userId }, {
 			ed25519PublicKey: ed25519.publicKey,
 			ed25519PrivateKey: ed25519.privateKey,
 		});
 		this.globalEventService.publishInternalEvent('userKeypairUpdated', { userId });
+		return true;
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
index cf3dce465e..e161ac9973 100644
--- a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
+++ b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
@@ -12,8 +12,8 @@ import { QueueService } from '@/core/QueueService.js';
 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';
+import { UserKeypairService } from '../UserKeypairService.js';
 
 interface IRecipe {
 	type: string;
@@ -112,9 +112,11 @@ class DeliverManager {
 			/**
 			 * 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);
+			const created = await this.userKeypairService.refreshAndprepareEd25519KeyPair(this.actor.id);
+			if (created) {
+				// リモートに配信
+				await this.accountUpdateService.publishToFollowers(this.actor.id, true);
+			}
 		}
 		//#endregion