diff --git a/src/main.ts b/src/main.ts
index 23ffc95..13378e6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,6 +1,7 @@
 import './meta'
 
-import { waitForDocumentLoaded, saveAs, console } from './utils'
+import FileSaver from 'file-saver'
+import { waitForDocumentLoaded, console } from './utils'
 import { downloadPDF } from './pdf'
 import { downloadMscz } from './mscz'
 import { getFileUrl } from './file'
@@ -9,6 +10,8 @@ import { BtnList, BtnAction, BtnListMode } from './btn'
 import { ScoreInfoInPage, SheetInfoInPage } from './scoreinfo'
 import i18n from './i18n'
 
+const { saveAs } = FileSaver
+
 const main = (): void => {
   const btnList = new BtnList()
   const scoreinfo = new ScoreInfoInPage(document)
@@ -22,7 +25,7 @@ const main = (): void => {
 
   btnList.add({
     name: i18n('DOWNLOAD')('MSCZ'),
-    action: BtnAction.process(() => downloadMscz(scoreinfo)),
+    action: BtnAction.process(() => downloadMscz(scoreinfo, saveAs)),
   })
 
   btnList.add({
diff --git a/src/mscz.ts b/src/mscz.ts
index cec07c2..8b64d79 100644
--- a/src/mscz.ts
+++ b/src/mscz.ts
@@ -1,5 +1,5 @@
 
-import { saveAs, assertRes, getFetch } from './utils'
+import { assertRes, getFetch } from './utils'
 import { ScoreInfo } from './scoreinfo'
 
 const MSCZ_BUF_SYM = Symbol('msczBufferP')
@@ -29,7 +29,7 @@ export const fetchMscz = async (scoreinfo: ScoreInfo, _fetch = getFetch()): Prom
   return msczBufferP
 }
 
-export const downloadMscz = async (scoreinfo: ScoreInfo): Promise<void> => {
+export const downloadMscz = async (scoreinfo: ScoreInfo, saveAs: typeof import('file-saver').saveAs): Promise<void> => {
   const data = new Blob([await fetchMscz(scoreinfo)])
   const filename = scoreinfo.fileName
   saveAs(data, `${filename}.mscz`)
diff --git a/src/pdf.ts b/src/pdf.ts
index c9da3a8..ade9a25 100644
--- a/src/pdf.ts
+++ b/src/pdf.ts
@@ -1,14 +1,14 @@
 
 import { PDFWorkerHelper } from './worker-helper'
 import { getFileUrl } from './file'
-import { saveAs } from './utils'
+import FileSaver from 'file-saver'
 import { ScoreInfo, SheetInfo } from './scoreinfo'
 
 let pdfBlob: Blob
 
 const _downloadPDF = async (imgURLs: string[], imgType: 'svg' | 'png', name = ''): Promise<void> => {
   if (pdfBlob) {
-    return saveAs(pdfBlob, `${name}.pdf`)
+    return FileSaver.saveAs(pdfBlob, `${name}.pdf`)
   }
 
   const cachedImg = document.querySelector('img[src*=score_]') as HTMLImageElement
@@ -20,7 +20,7 @@ const _downloadPDF = async (imgURLs: string[], imgType: 'svg' | 'png', name = ''
 
   pdfBlob = new Blob([pdfArrayBuffer])
 
-  saveAs(pdfBlob, `${name}.pdf`)
+  FileSaver.saveAs(pdfBlob, `${name}.pdf`)
 }
 
 export const downloadPDF = async (scoreinfo: ScoreInfo, sheet: SheetInfo): Promise<void> => {
diff --git a/src/utils.ts b/src/utils.ts
index d1e71f5..b89ec2a 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,9 +1,6 @@
 
-import FileSaver from 'file-saver/dist/FileSaver.js'
 import isNodeJs from 'detect-node'
 
-export const saveAs: typeof import('file-saver').saveAs = FileSaver.saveAs
-
 export const getIndexPath = (id: number): string => {
   const idStr = String(id)
   // 获取最后三位，倒序排列