diff --git a/app/index.js b/app/index.js
index 56ef44f..66df4a2 100644
--- a/app/index.js
+++ b/app/index.js
@@ -1,9 +1,7 @@
-'use strict';
-
-const express = require('express');
-const http = require('http');
-const middleware = require('./middleware');
-const routes = require('./routes');
+import express from 'express';
+import http from 'node:http';
+import middleware from './middleware.js';
+import routes from './routes.js';
 
 const app = express();
 const server = http.createServer(app);
diff --git a/app/middleware.js b/app/middleware.js
index e5b56de..0a75ef1 100644
--- a/app/middleware.js
+++ b/app/middleware.js
@@ -1,9 +1,7 @@
-'use strict';
-
-const express = require('express');
-const logging = require('pino-http');
-const compression = require('compression');
-const helmet = require('helmet');
+import express from 'express';
+import logging from 'pino-http';
+import compression from 'compression';
+import helmet from 'helmet';
 
 const middleware = [
   express.urlencoded({ extended: true }),
@@ -29,4 +27,4 @@ const middleware = [
   compression()
 ];
 
-module.exports = middleware;
\ No newline at end of file
+export default middleware;
diff --git a/app/package.json b/app/package.json
index ceffc0d..e8be58f 100644
--- a/app/package.json
+++ b/app/package.json
@@ -1,8 +1,9 @@
 {
   "name": "node-webserver",
-  "version": "1.5.2",
+  "version": "1.6.0",
   "description": "test application - web server",
   "main": "index.js",
+  "type": "module",
   "scripts": {
     "test": "echo \"Debug: no test specified\" && exit 0",
     "start": "node index.js",
@@ -39,8 +40,5 @@
   },
   "bugs": {
     "url": "https://github.com/saidsef/node-webserver/issues"
-  },
-  "devDependencies": {
-    "mocha": "^11.0.1"
   }
 }
diff --git a/app/routes.js b/app/routes.js
index d074066..6b55592 100644
--- a/app/routes.js
+++ b/app/routes.js
@@ -1,7 +1,6 @@
-'use strict';
+import express from 'express';
+import crypto from 'node:crypto';
 
-const express = require('express');
-const crypto = require('crypto');
 const router = express.Router();
 
 router.get('/healthz', (req, res) => {
@@ -26,4 +25,4 @@ router.get('*default', (req, res) => {
   });
 });
 
-module.exports = router;
\ No newline at end of file
+export default router;