diff --git a/package-lock.json b/package-lock.json
index 9a55d6f..f4b82ab 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -7241,6 +6717,12 @@
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@@ -7262,24 +6744,23 @@
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@@ -7377,43 +6835,23 @@
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-          "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
-          "dev": true
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
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-      "integrity": "sha1-jQrELxbqVd69MyyvTEA4s+P139k=",
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
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diff --git a/package.json b/package.json
index 9f6d492..affd946 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,9 @@
     "url": "https://github.com/kagucho/kagucho2017/issues"
   },
   "homepage": "https://github.com/kagucho/kagucho2017#readme",
+  "engines": {
+    "node": ">= 8.9.0"
+  },
   "dependencies": {
     "electron": "^3.0.6",
     "material-design-icons": "^3.0.1",
@@ -25,13 +28,14 @@
     "photoswipe": "^4.1.2"
   },
   "devDependencies": {
-    "css-loader": "^0.28.11",
+    "css-loader": "^1.0.1",
     "eslint": "^5.8.0",
     "eslint-config-google": "^0.11.0",
-    "extract-text-webpack-plugin": "^3.0.2",
-    "file-loader": "^1.1.9",
+    "extract-text-webpack-plugin": "^4.0.0-beta.0",
+    "file-loader": "^2.0.0",
+    "postcss-loader": "^3.0.0",
     "style-loader": "^0.23.1",
-    "uglifyjs-webpack-plugin": "^1.3.0",
-    "webpack": "^3.12.0"
+    "webpack": "^4.23.1",
+    "webpack-cli": "^3.1.2"
   }
 }
diff --git a/play/common.webpack.config.js b/play/common.webpack.config.js
index 9f313fa..6296c5c 100755
--- a/play/common.webpack.config.js
+++ b/play/common.webpack.config.js
@@ -15,8 +15,6 @@
   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
-const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
-
 module.exports = {
   module: {
     rules: [
@@ -27,6 +25,4 @@ module.exports = {
     ],
   },
   node: {__dirname: false},
-  plugins: process.env.NODE_ENV == 'production' ?
-    [new UglifyJSPlugin({uglifyOptions: {ecma: 8}})] : [],
 };
diff --git a/play/main/webpack.config.js b/play/main/webpack.config.js
index 858ab1e..5c3cc0f 100755
--- a/play/main/webpack.config.js
+++ b/play/main/webpack.config.js
@@ -20,6 +20,9 @@ const path = require('path');
 
 module.exports = Object.assign({
 	entry: '.',
+	externals: {
+	    electron: 'electron'
+	},
 	output: {
 		filename: '[name].js',
 		path: path.join(__dirname, '../../output/kagucho2017/play'),
diff --git a/play/renderer/webpack.config.js b/play/renderer/webpack.config.js
index 82e268e..d4b7ef9 100755
--- a/play/renderer/webpack.config.js
+++ b/play/renderer/webpack.config.js
@@ -32,8 +32,26 @@ module.exports.module.rules.push({
 	test: /\.css$/,
 	use: ExtractTextWebpackPlugin.extract({
 		fallback: 'style-loader',
-		use: process.env.NODE_ENV == 'production' ?
-			'css-loader?minimize' : 'css-loader',
+		//TODO: process.env.NODE_ENV doesn't work
+		use: process.env.NODE_ENV == 'production'
+			? [
+				'css-loader',
+				{
+					loader: 'postcss-loader',
+					options: {
+						plugins: {
+							cssnano: {
+								preset: ['default', {
+									discardComments: {
+										removeAll: true
+									}
+								}]
+							}
+						}
+					}
+				}
+			]
+			: 'css-loader',
 	}),
 });