diff --git a/packages/backend/src/server/web/UrlPreviewService.ts b/packages/backend/src/server/web/UrlPreviewService.ts
index b9a4015031..bd1dbb430c 100644
--- a/packages/backend/src/server/web/UrlPreviewService.ts
+++ b/packages/backend/src/server/web/UrlPreviewService.ts
@@ -4,8 +4,7 @@
  */
 
 import { Inject, Injectable } from '@nestjs/common';
-import { summaly } from '@misskey-dev/summaly';
-import { SummalyResult } from '@misskey-dev/summaly/built/summary.js';
+import type { SummalyResult } from '@misskey-dev/summaly/built/summary.js';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
@@ -113,7 +112,7 @@ export class UrlPreviewService {
 		}
 	}
 
-	private fetchSummary(url: string, meta: MiMeta, lang?: string): Promise<SummalyResult> {
+	private async fetchSummary(url: string, meta: MiMeta, lang?: string): Promise<SummalyResult> {
 		const agent = this.config.proxy
 			? {
 				http: this.httpRequestService.httpAgent,
@@ -121,6 +120,8 @@ export class UrlPreviewService {
 			}
 			: undefined;
 
+		const { summaly } = await import('@misskey-dev/summaly');
+
 		return summaly(url, {
 			followRedirects: this.meta.urlPreviewAllowRedirect,
 			lang: lang ?? 'ja-JP',