diff --git a/app.js b/app.js
index 11b50d2..651cff6 100644
--- a/app.js
+++ b/app.js
@@ -1,19 +1,19 @@
-var express = require('express');
-var path = require('path');
-var favicon = require('serve-favicon');
-var logger = require('morgan');
-var cookieParser = require('cookie-parser');
-var bodyParser = require('body-parser');
-var sassMiddleware = require('node-sass-middleware');
-var subdomain = require('express-subdomain');
+import express from 'express';
+import path from 'path'
+import logger from "morgan";
+// import favicon from "serve-favicon";
+import cookieParser from "cookie-parser";
+import bodyParser from "body-parser";
+import sassMiddleware from "node-sass-middleware";
 
-var index = require('./routes/index');
-var cufs = require('./routes/cufs');
-var uonetplus = require('./routes/uonetplus');
-var uonetplusOpiekun = require('./routes/uonetplus-opiekun');
-var uonetplusUzytkownik = require('./routes/uonetplus-uzytkownik');
+import subdomain from "express-subdomain";
+import index from "./routes/index";
+import cufs from "./routes/cufs";
+import uonetplus from "./routes/uonetplus";
+import uonetplusOpiekun from "./routes/uonetplus-opiekun";
+import uonetplusUzytkownik from "./routes/uonetplus-uzytkownik";
 
-var app = express();
+const app = express();
 
 // view engine setup
 app.set('views', path.join(__dirname, 'views'));
@@ -33,7 +33,7 @@ app.use(sassMiddleware({
 }));
 app.use(express.static(path.join(__dirname, 'public')));
 
-app.use(function (req, res, next) {
+app.use((req, res, next) => {
   res.locals.uonetplusUrl = "http://" + req.get('host').replace("uonetplus-opiekun", "uonetplus");
   res.locals.mainHost = "http://" + req.get('host')
     .replace(/(cufs|uonetplus|uonetplus-opiekun|uonetplus-uzytkownik)\./, "");
@@ -47,14 +47,14 @@ app.use(subdomain('uonetplus-uzytkownik', uonetplusUzytkownik));
 app.use('/', index);
 
 // catch 404 and forward to error handler
-app.use(function(req, res, next) {
-  var err = new Error('Not Found');
+app.use((req, res, next) => {
+  const err = new Error('Not Found');
   err.status = 404;
   next(err);
 });
 
 // error handler
-app.use(function(err, req, res, next) {
+app.use((err, req, res, next) => {
   // set locals, only providing error in development
   res.locals.message = err.message;
   res.locals.error = req.app.get('env') === 'development' ? err : {};
diff --git a/routes/cufs.js b/routes/cufs.js
index c2e94e9..b7e04df 100644
--- a/routes/cufs.js
+++ b/routes/cufs.js
@@ -1,19 +1,19 @@
-var express = require('express');
-var fs = require('fs');
-var router = express.Router();
-var protocol = require('../utils/connection');
+const express = require('express');
+const fs = require('fs');
+const router = express.Router();
+const protocol = require('../utils/connection');
 
-router.get("/", function(req, res) {
+router.get("/", (req, res) => {
   res.redirect("/Default/Account/LogOn");
 });
 
 // GET login page
-router.get("/Default/Account/LogOn", function(req, res) {
+router.get("/Default/Account/LogOn", (req, res) => {
   res.render("login-form", { title: "Logowanie (Default)" });
 });
 
 // POST login
-router.post("/Default/Account/LogOn", function(req, res) {
+router.post("/Default/Account/LogOn", (req, res) => {
   if ('admin' === req.body.LoginName && 'admin' === req.body.Password) {
     return res.redirect("/Default/FS/LS?" +
       "wa=wsignin1.0&" +
@@ -24,7 +24,7 @@ router.post("/Default/Account/LogOn", function(req, res) {
   res.render("login-form", { title: "Logowanie (Default)", message: "Zła nazwa użytkownika lub hasło" });
 });
 
-router.get("/Default/FS/LS", function (req, res) {
+router.get("/Default/FS/LS", (req, res) => {
   res.render("login-cert", {
     cert: fs.readFileSync("public/cert.xml", "utf8"),
     uonetplusOpiekun: protocol(req) + "://" + req.get('host').replace("cufs.", "uonetplus.")
diff --git a/utils/connection.js b/utils/connection.js
index c701303..d773264 100644
--- a/utils/connection.js
+++ b/utils/connection.js
@@ -1,6 +1,6 @@
 
 function getProtocol(req) {
-  var proto = req.connection.encrypted ? 'https' : 'http';
+  let proto = req.connection.encrypted ? 'https' : 'http';
   // only do this if you trust the proxy
   proto = req.headers['x-forwarded-proto'] || proto;
   return proto.split(/\s*,\s*/)[0];