diff --git a/hl-tests/64/proxy.js b/hl-tests/64/proxy.js
index 3befec6..84ad31b 100644
--- a/hl-tests/64/proxy.js
+++ b/hl-tests/64/proxy.js
@@ -49,7 +49,5 @@ http
     res.writeHead(200);
     res.write(req.url);
     res.end();
-
-    console.log(req.host);
   })
   .listen(3000);
diff --git a/index.js b/index.mjs
similarity index 100%
rename from index.js
rename to index.mjs
diff --git a/lib/docker.mjs b/lib/docker.mjs
index c19e36c..594ebdb 100644
--- a/lib/docker.mjs
+++ b/lib/docker.mjs
@@ -7,9 +7,9 @@
 	This module handles automatic regitration and de-registration of
 	services running on docker containers.
 */
-var Dolphin = require('dolphin');
+import Dolphin from 'dolphin';
 
-function DockerModule(redbird, url) {
+export function DockerModule(redbird, url) {
   if (!(this instanceof DockerModule)) {
     //TODO: should it return a new instance per redbird proxy?
     //because every time we run -> docker(redbird).register("localhost", "tomcat*")
@@ -163,4 +163,3 @@ function containerPort(dolphin, containerId) {
   });
 }
 
-module.exports = DockerModule;
diff --git a/lib/etcd-backend.mjs b/lib/etcd-backend.mjs
index 7677d6f..98b0823 100644
--- a/lib/etcd-backend.mjs
+++ b/lib/etcd-backend.mjs
@@ -5,9 +5,9 @@
 	Redbird ETCD Module
 	This module handles automatic proxy registration via etcd
 */
-var Etcd = require('node-etcd');
+import Etcd from 'node-etcd';
 
-function ETCDModule(redbird, options) {
+export function ETCDModule(redbird, options) {
   if (!(this instanceof ETCDModule)) {
     return new ETCDModule(redbird, options);
   }
@@ -64,7 +64,7 @@ function ETCDModule(redbird, options) {
       } else if (body.node.key && body.node.value && IsJsonString(body.node.value)) {
         var config = JSON.parse(body.node.value);
         if (typeof config.docker !== 'undefined') {
-          require('..')
+          require('../index.mjs')
             .docker(_this.redbird)
             .register(body.node.key, body.node.value.docker, body.node.value);
         } else {
@@ -86,5 +86,3 @@ function ETCDModule(redbird, options) {
     });
   }
 }
-
-module.exports = ETCDModule;
diff --git a/lib/letsencrypt.js b/lib/letsencrypt.mjs
similarity index 97%
rename from lib/letsencrypt.js
rename to lib/letsencrypt.mjs
index 0e30efb..f0de0a1 100644
--- a/lib/letsencrypt.js
+++ b/lib/letsencrypt.mjs
@@ -135,5 +135,7 @@ function getCertificates(domain, email, production, renew, logger) {
   });
 }
 
-module.exports.init = init;
-module.exports.getCertificates = getCertificates;
+//module.exports.init = init;
+//module.exports.getCertificates = getCertificates;
+
+export { init, getCertificates };
diff --git a/lib/proxy.mjs b/lib/proxy.mjs
index eb26c5c..48c02e8 100755
--- a/lib/proxy.mjs
+++ b/lib/proxy.mjs
@@ -1,19 +1,22 @@
 /*eslint-env node */
 'use strict';
 
-const http = require('http'),
-  httpProxy = require('http-proxy'),
-  validUrl = require('valid-url'),
-  parseUrl = require('url').parse,
-  path = require('path'),
-  _ = require('lodash'),
-  pino = require('pino'),
-  cluster = require('cluster'),
-  hash = require('object-hash'),
-  LRUCache = require('lru-cache'),
-  routeCache = new LRUCache({ max: 5000 }),
-  safe = require('safetimeout'),
-  letsencrypt = require('./letsencrypt.js');
+import http from 'http';
+import httpProxy from 'http-proxy';
+import validUrl from 'valid-url';
+import { parse as parseUrl } from 'url';
+import path from 'path';
+import _ from 'lodash';
+import pino from 'pino';
+import cluster from 'cluster';
+import hash from 'object-hash';
+import safe from 'safetimeout';
+import * as letsencrypt from './letsencrypt.mjs';
+import { LRUCache } from 'lru-cache';
+
+const routeCache = new LRUCache({ max: 5000 });
+
+import tls from 'tls';
 
 const ONE_DAY = 60 * 60 * 24 * 1000;
 const ONE_MONTH = ONE_DAY * 30;
@@ -44,8 +47,8 @@ export function Redbird(opts) {
     throw Error('cluster setting must be an integer less than 32');
   }
 
-  if (opts.cluster && cluster.isMaster) {
-    for (const i = 0; i < opts.cluster; i++) {
+  if (opts.cluster && cluster.isPrimary) {
+    for (let i = 0; i < opts.cluster; i++) {
       cluster.fork();
     }
 
@@ -247,7 +250,7 @@ Redbird.prototype.setupHttpsProxy = function (proxy, websocketsUpgrade, log, ssl
 
   const certs = this.certs;
 
-  const ssl = {
+  let ssl = {
     SNICallback: function (hostname, cb) {
       if (cb) {
         cb(null, certs[hostname]);
@@ -450,7 +453,7 @@ Redbird.prototype.updateCertificates = function (domain, email, production, rene
         //
         // TODO: cluster friendly
         //
-        const renewTime = certs.expiresAt - Date.now() - renewWithin;
+        let renewTime = certs.expiresAt - Date.now() - renewWithin;
         renewTime =
           renewTime > 0 ? renewTime : _this.opts.letsencrypt.minRenewTime || 60 * 60 * 1000;
 
@@ -728,15 +731,18 @@ Redbird.prototype.close = function () {
   }
 */
 
-const respondNotFound = function (req, res) {
+let respondNotFound = function (req, res) {
   res.statusCode = 404;
   res.write('Not Found');
   res.end();
 };
 
 Redbird.prototype.notFound = function (callback) {
-  if (typeof callback == 'function') respondNotFound = callback;
-  else throw Error('notFound callback is not a function');
+  if (typeof callback == 'function') {
+    respondNotFound = callback;
+  } else {
+    throw Error('notFound callback is not a function');
+  }
 };
 
 //
@@ -769,7 +775,7 @@ function prepareUrl(url) {
     url = setHttp(url);
 
     if (!validUrl.isHttpUri(url) && !validUrl.isHttpsUri(url)) {
-      throw Error('uri is not a valid http uri ' + url);
+      throw Error(`uri is not a valid http uri ${url}`);
     }
 
     url = parseUrl(url);
@@ -812,7 +818,7 @@ function unbundleCert(bundle) {
   const ca = [];
   const cert = [];
 
-  for (const i = 0, len = chain.length; i < len; i++) {
+  for (let i = 0, len = chain.length; i < len; i++) {
     const line = chain[i].trim();
     if (!(line.length !== 0)) {
       continue;
@@ -821,13 +827,13 @@ function unbundleCert(bundle) {
     if (line.match(/-END CERTIFICATE-/)) {
       const joined = cert.join('\n');
       ca.push(joined);
-      cert = [];
+      //cert = [];
+      cert.length = 0;
     }
   }
   return ca;
 }
 
-const tls = require('tls');
 function createCredentialContext(key, cert, ca) {
   const opts = {};
 
diff --git a/package.json b/package.json
index aa8d57b..6f2a385 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "le-challenge-fs": "^2.0.9",
     "le-store-certbot": "^2.2.3",
     "lodash": "^4.17.15",
-    "lru-cache": "^5.1.1",
+    "lru-cache": "^11.0.1",
     "node-etcd": "^7.0.0",
     "object-hash": "^1.3.1",
     "pino": "^9.4.0",
diff --git a/test/custom_resolver.spec.js b/test/custom_resolver.spec.js
index 0d21ece..61875fa 100644
--- a/test/custom_resolver.spec.js
+++ b/test/custom_resolver.spec.js
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { Redbird } from '../'; // Adjust the import path if necessary
+import { Redbird } from '../index.mjs'; // Adjust the import path if necessary
 import { expect } from 'chai';
 
 const opts = {
diff --git a/test/hostheader.spec.js b/test/hostheader.spec.js
index e46c753..9230e96 100644
--- a/test/hostheader.spec.js
+++ b/test/hostheader.spec.js
@@ -1,7 +1,7 @@
 'use strict';
 
 import { describe, it, expect } from 'vitest';
-import { Redbird } from '../'; // Adjust the import path if necessary
+import { Redbird } from '../index.mjs'; // Adjust the import path if necessary
 import { expect } from 'chai';
 import { createServer } from 'http';
 import fetch from 'node-fetch';
diff --git a/test/onrequest.spec.js b/test/onrequest.spec.js
index 60a4a54..0daeec4 100644
--- a/test/onrequest.spec.js
+++ b/test/onrequest.spec.js
@@ -1,7 +1,7 @@
 'use strict';
 
 import { describe, it, expect } from 'vitest';
-import { Redbird } from '../'; // Adjust the import path if necessary
+import { Redbird } from '../index.mjs'; // Adjust the import path if necessary
 import { expect } from 'chai';
 import fetch from 'node-fetch';
 import { createServer } from 'http';
diff --git a/test/pathnames.spec.js b/test/pathnames.spec.js
index 1ec5e34..1db9886 100644
--- a/test/pathnames.spec.js
+++ b/test/pathnames.spec.js
@@ -2,7 +2,7 @@
 
 import { createServer, get } from 'http';
 import { describe, it, expect } from 'vitest';
-import { Redbird } from '../'; // Adjust the import path if necessary
+import { Redbird } from '../index.mjs'; // Adjust the import path if necessary
 import { expect } from 'chai';
 
 const TEST_PORT = 54673;
diff --git a/test/register.spec.js b/test/register.spec.js
index b5e295b..2358f2e 100644
--- a/test/register.spec.js
+++ b/test/register.spec.js
@@ -1,7 +1,7 @@
 'use strict';
 
 import { describe, it, expect } from 'vitest';
-import { Redbird } from '../'; // Adjust the import path if necessary
+import { Redbird } from '../index.mjs'; // Adjust the import path if necessary
 import { expect } from 'chai';
 
 const opts = {
diff --git a/yarn.lock b/yarn.lock
index 4787e05..3c36000 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1971,12 +1971,10 @@ lru-cache@2:
   resolved "https://registry.npmjs.org/lru-cache/-/lru-cache-2.7.3.tgz"
   integrity sha1-bUUk6LlV+V1PW1iFHOId1y+06VI=
 
-lru-cache@^5.1.1:
-  version "5.1.1"
-  resolved "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz"
-  integrity sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==
-  dependencies:
-    yallist "^3.0.2"
+lru-cache@^11.0.1:
+  version "11.0.1"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-11.0.1.tgz#3a732fbfedb82c5ba7bca6564ad3f42afcb6e147"
+  integrity sha512-CgeuL5uom6j/ZVrg7G/+1IXqRY8JXX4Hghfy5YE0EhoYQWvndP1kufu58cmZLNIDKnRhZrXfdS9urVWx98AipQ==
 
 magic-string@^0.30.10:
   version "0.30.11"
@@ -2124,7 +2122,7 @@ node-domexception@^1.0.0:
 
 node-etcd@^7.0.0:
   version "7.0.0"
-  resolved "https://registry.npmjs.org/node-etcd/-/node-etcd-7.0.0.tgz"
+  resolved "https://registry.yarnpkg.com/node-etcd/-/node-etcd-7.0.0.tgz#87416d56d44104049822ca242e47d01728a34ed3"
   integrity sha512-kGnYVoxdDuUU2ojCt0GnZhR2wMRZWyJvq0OsWX+adExUbiX0z7D+8//nlv9Gnve1dIvNEQ/mvM+72aSKnWVp5Q==
   dependencies:
     deasync "^0.1.13"
@@ -3215,8 +3213,3 @@ xml-escape@~1.0.0:
   version "4.0.1"
   resolved "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz"
   integrity sha1-pcbVMr5lbiPbgg77lDofBJmNY68=
-
-yallist@^3.0.2:
-  version "3.1.1"
-  resolved "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz"
-  integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==