diff --git a/packages/backend/src/core/QueueService.ts b/packages/backend/src/core/QueueService.ts
index ef2ec0d2ff..7ba1853f84 100644
--- a/packages/backend/src/core/QueueService.ts
+++ b/packages/backend/src/core/QueueService.ts
@@ -12,7 +12,6 @@ import type { Config } from '@/config.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
 import type { Antenna } from '@/server/api/endpoints/i/import-antennas.js';
-import { ApRequestCreator } from '@/core/activitypub/ApRequestService.js';
 import type { DbQueue, DeliverQueue, EndedPollNotificationQueue, InboxQueue, ObjectStorageQueue, RelationshipQueue, SystemQueue, WebhookDeliverQueue } from './QueueModule.js';
 import type { DbJobData, DeliverJobData, RelationshipJobData, ThinUser } from '../queue/types.js';
 import type * as Bull from 'bullmq';
@@ -76,14 +75,12 @@ export class QueueService {
 		if (to == null) return null;
 
 		const contentBody = JSON.stringify(content);
-		const digest = ApRequestCreator.createDigest(contentBody);
 
 		const data: DeliverJobData = {
 			user: {
 				id: user.id,
 			},
 			content: contentBody,
-			digest,
 			to,
 			isSharedInbox,
 		};
@@ -109,7 +106,6 @@ export class QueueService {
 	public async deliverMany(user: ThinUser, content: IActivity | null, inboxes: Map<string, boolean>) {
 		if (content == null) return null;
 		const contentBody = JSON.stringify(content);
-		const digest = ApRequestCreator.createDigest(contentBody);
 
 		const opts = {
 			attempts: this.config.deliverJobMaxAttempts ?? 12,
@@ -125,7 +121,6 @@ export class QueueService {
 			data: {
 				user,
 				content: contentBody,
-				digest,
 				to: d[0],
 				isSharedInbox: d[1],
 			} as DeliverJobData,
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index 717e47d4b4..cc2f05aba2 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -28,7 +28,7 @@ type PrivateKey = {
 	keyId: string;
 };
 
-export function createSignedPost(args: { level: string; key: PrivateKey; url: string; body: string; digest?: string; additionalHeaders: Record<string, string> }) {
+export function createSignedPost(args: { level: string; key: PrivateKey; url: string; body: string; additionalHeaders: Record<string, string> }) {
 	const u = new URL(args.url);
 	const request: RequestLike = {
 		url: u.href,
@@ -42,7 +42,7 @@ export function createSignedPost(args: { level: string; key: PrivateKey; url: st
 	};
 
 	// TODO: levelによって処理を分ける
-	const digestHeader = args.digest ?? genRFC3230DigestHeader(args.body);
+	const digestHeader = genRFC3230DigestHeader(args.body);
 	request.headers['Digest'] = digestHeader;
 
 	const result = signAsDraftToRequest(request, args.key, ['(request-target)', 'date', 'host', 'digest']);
@@ -105,7 +105,7 @@ export class ApRequestService {
 	}
 
 	@bindThis
-	public async signedPost(user: { id: MiUser['id'] }, url: string, object: unknown, level: string, digest?: string): Promise<void> {
+	public async signedPost(user: { id: MiUser['id'] }, url: string, object: unknown, level: string): Promise<void> {
 		const body = typeof object === 'string' ? object : JSON.stringify(object);
 
 		const req = createSignedPost({
@@ -113,7 +113,6 @@ export class ApRequestService {
 			key: await this.getPrivateKey(user.id, level),
 			url,
 			body,
-			digest,
 			additionalHeaders: {
 			},
 		});
diff --git a/packages/backend/src/queue/processors/DeliverProcessorService.ts b/packages/backend/src/queue/processors/DeliverProcessorService.ts
index 8f3782a048..6bbe7a4973 100644
--- a/packages/backend/src/queue/processors/DeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeliverProcessorService.ts
@@ -76,7 +76,7 @@ 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);
+			await this.apRequestService.signedPost(job.data.user, job.data.to, job.data.content, server.httpMessageSignaturesImplementationLevel);
 
 			// Update stats
 			if (server.isNotResponding) {
diff --git a/packages/backend/src/queue/types.ts b/packages/backend/src/queue/types.ts
index 135bccb60c..fcae4c2596 100644
--- a/packages/backend/src/queue/types.ts
+++ b/packages/backend/src/queue/types.ts
@@ -32,8 +32,6 @@ export type DeliverJobData = {
 	user: ThinUser;
 	/** Activity */
 	content: string;
-	/** Digest header */
-	digest: string;
 	/** inbox URL to deliver */
 	to: string;
 	/** whether it is sharedInbox */