diff --git a/packages/backend/src/core/HttpRequestService.ts b/packages/backend/src/core/HttpRequestService.ts
index 6787dab907..632e8f98ae 100644
--- a/packages/backend/src/core/HttpRequestService.ts
+++ b/packages/backend/src/core/HttpRequestService.ts
@@ -211,6 +211,7 @@ export class HttpRequestService {
 			bodyTimeout: 10 * 1000,
 			maxHeaderSize: 16364, // default
 			maxResponseSize: 10 * 1024 * 1024,
+			maxRedirections: 3,
 			connect: {
 				timeout: 10 * 1000, // コネクションが確立するまでのタイムアウト
 				maxCachedSessions: 300, // TLSセッションのキャッシュ数 https://github.com/nodejs/undici/blob/v5.14.0/lib/core/connect.js#L80
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index fe487e8fd6..c686a7bfd8 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -37,7 +37,9 @@ export class ApRequestService {
 		private userKeypairStoreService: UserKeypairStoreService,
 		private httpRequestService: HttpRequestService,
 	) {
-		this.undiciFetcher = new UndiciFetcher(this.httpRequestService.getStandardUndiciFetcherOption());
+		this.undiciFetcher = new UndiciFetcher(this.httpRequestService.getStandardUndiciFetcherOption({
+			maxRedirections: 0,
+		}));
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/activitypub/ApResolverService.ts b/packages/backend/src/core/activitypub/ApResolverService.ts
index 94c053473e..2f8c97d375 100644
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@@ -35,7 +35,9 @@ export class Resolver {
 		private recursionLimit = 100,
 	) {
 		this.history = new Set();
-		this.undiciFetcher = new UndiciFetcher(this.httpRequestService.getStandardUndiciFetcherOption());
+		this.undiciFetcher = new UndiciFetcher(this.httpRequestService.getStandardUndiciFetcherOption({
+			maxRedirections: 0,
+		}));
 	}
 
 	@bindThis