diff --git a/app/main/system.js b/app/main/system.js
index 715c1a3e..05f86167 100644
--- a/app/main/system.js
+++ b/app/main/system.js
@@ -11,7 +11,6 @@ function system(mainWindow, dir, lang) {
 	const BrowserWindow = electron.BrowserWindow;
 	const dialog = electron.dialog;
 	const os = require('os')
-    const fm = require('font-manager');
     const language=require("../main/language.js");
 	ipc.on('native-notf', function(e, args) {
         
@@ -172,6 +171,7 @@ function system(mainWindow, dir, lang) {
 		fn(data); // ソート後の配列を返す
 	}
 	ipc.on('fonts', (e, arg) => {
+		const fm = require('font-manager');
 		var fonts = fm.getAvailableFontsSync();
 		object_array_sort(fonts, 'family', 'asc', function(fonts_sorted) {
 			mainWindow.webContents.send('font-list', fonts_sorted);
diff --git a/app/package.json b/app/package.json
index b96ad005..256c3e35 100644
--- a/app/package.json
+++ b/app/package.json
@@ -40,7 +40,6 @@
   "license": "GPL-3.0",
   "dependencies": {
     "electron-dl": "^1.11.0",
-    "font-manager": "^0.3.0",
     "jimp": "^0.2.28",
     "json5": "^2.1.0",
     "node-notifier": "^5.2.1",
@@ -49,7 +48,8 @@
   },
   "optionalDependencies": {
     "nowplaying-node": "^0.1.3",
-    "itunes-nowplaying-mac": "git+https://github.com/rinsuki/itunes-nowplaying-mac#pull/1/head"
+    "itunes-nowplaying-mac": "git+https://github.com/rinsuki/itunes-nowplaying-mac#pull/1/head",
+    "font-manager": "^0.3.0"
   },
   "build": {
     "productName": "TheDesk",