diff --git a/client-certificate/main.js b/client-certificate/main.js
index ddd210d..da3b2c0 100644
--- a/client-certificate/main.js
+++ b/client-certificate/main.js
@@ -1,21 +1,20 @@
-var app = require('app');
-var BrowserWindow = require('browser-window');
-
-var mainWindow = null;
-
-app.on('window-all-closed', function() {
-  if (process.platform != 'darwin')
-    app.quit();
-});
-
-//app.commandLine.appendSwitch('client-certificate',
-                             //'X:\\workspace\\client-certificates\\ssl\\client.crt');
-
-app.on('ready', function() {
-  mainWindow = new BrowserWindow({
-    'width': 800,
-    'height': 600,
-  });
-
-  mainWindow.loadUrl('https://localhost:5000');
-});
+const {app, BrowserWindow} = require('electron');
+
+let mainWindow;
+
+app.on('window-all-closed', function() {
+  if (process.platform != 'darwin')
+    app.quit();
+});
+
+//app.commandLine.appendSwitch('client-certificate',
+                             //'path/to/client-certificates/ssl/client.crt');
+
+app.on('ready', function() {
+  mainWindow = new BrowserWindow({
+    'width': 800,
+    'height': 600,
+  });
+
+  mainWindow.loadURL('https://localhost:5000');
+});
diff --git a/client-certificate/package.json b/client-certificate/package.json
index cf40f45..c7b7a9c 100644
--- a/client-certificate/package.json
+++ b/client-certificate/package.json
@@ -1,5 +1,5 @@
-{
-  "name"    : "client-certificate-demo",
-  "version" : "0.1.0",
-  "main"    : "main.js"
-}
+{
+  "name"    : "client-certificate-demo",
+  "version" : "1.1.0",
+  "main"    : "main.js"
+}
diff --git a/client-certificate/server.js b/client-certificate/server.js
index 98700b6..8fb469e 100644
--- a/client-certificate/server.js
+++ b/client-certificate/server.js
@@ -1,21 +1,21 @@
-var https = require('https');
-var fs = require('fs');         
-
-var options = {
-  key:  fs.readFileSync('ssl/server.key'),
-  cert: fs.readFileSync('ssl/server.crt'),
-  ca:   fs.readFileSync('ssl/rootCA.crt'),
-  requestCert:        true,
-  rejectUnauthorized: false
-};
-
-https.createServer(options, function (req, res) {
-  console.log('Receive a request.');
-  if (req.client.authorized) {
-    res.writeHead(200);
-    res.end('approved\n');
-  } else {
-    res.writeHead(401);
-    res.end('denied\n');
-  }
-}).listen(5000);
+const https = require('https');
+const fs = require('fs');
+
+const options = {
+  key:  fs.readFileSync('ssl/server.key'),
+  cert: fs.readFileSync('ssl/server.crt'),
+  ca:   fs.readFileSync('ssl/rootCA.crt'),
+  requestCert:        true,
+  rejectUnauthorized: false
+};
+
+https.createServer(options, function (req, res) {
+  console.log('Receive a request.');
+  if (req.client.authorized) {
+    res.writeHead(200);
+    res.end('approved\n');
+  } else {
+    res.writeHead(401);
+    res.end('denied\n');
+  }
+}).listen(5000);