diff --git a/package.json b/package.json
index 928471a..8025e99 100644
--- a/package.json
+++ b/package.json
@@ -2,15 +2,17 @@
   "name": "@elastic/elasticsearch-serverless",
   "version": "0.6.0+20231031",
   "description": "The official Node.js Elastic client for the Elasticsearch Serverless service.",
-  "main": "index.js",
+  "main": "./index.js",
   "types": "index.d.ts",
-  "type": "commonjs",
+  "exports": {
+    "require": "./index.js"
+  },
   "scripts": {
     "lint": "ts-standard src",
     "lint:fix": "ts-standard --fix src",
     "license-checker": "license-checker --production --onlyAllow='MIT;Apache-2.0;Apache1.1;ISC;BSD-3-Clause;BSD-2-Clause;0BSD'",
     "prebuild": "npm run clean-build && npm run lint",
-    "build": "tsc",
+    "build": "tsc && rm lib/package.json && mv lib/src/* lib/ && rm -rf lib/src",
     "clean-build": "rimraf ./lib && mkdir lib",
     "prepublishOnly": "npm run build",
     "test": "npm run build && npm run lint && tap test/unit/{*,**/*}.test.ts",
diff --git a/src/client.ts b/src/client.ts
index d8113ae..1983e49 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -17,10 +17,11 @@
  * under the License.
  */
 
-import { ConnectionOptions as TlsConnectionOptions } from 'tls'
-import { URL } from 'url'
-import buffer from 'buffer'
-import os from 'os'
+import process from 'node:process'
+import { ConnectionOptions as TlsConnectionOptions } from 'node:tls'
+import { URL } from 'node:url'
+import buffer from 'node:buffer'
+import os from 'node:os'
 import {
   Transport,
   UndiciConnection,
@@ -44,17 +45,19 @@ import { RedactionOptions } from '@elastic/transport/lib/Transport'
 import BaseConnection, { prepareHeaders } from '@elastic/transport/lib/connection/BaseConnection'
 import Helpers from './helpers'
 import API from './api'
+import packageJson from '../package.json'
+import transportPackageJson from '@elastic/transport/package.json'
 
 const kChild = Symbol('elasticsearchjs-child')
 const kInitialOptions = Symbol('elasticsearchjs-initial-options')
-let clientVersion: string = require('../package.json').version // eslint-disable-line
+let clientVersion: string = packageJson.version
 /* istanbul ignore next */
 if (clientVersion.includes('-')) {
   // clean prerelease
   clientVersion = clientVersion.slice(0, clientVersion.indexOf('-')) + 'p'
 }
 const [clientVersionNoMeta, apiVersion] = clientVersion.split('+')
-let transportVersion: string = require('@elastic/transport/package.json').version // eslint-disable-line
+let transportVersion: string = transportPackageJson.version
 /* istanbul ignore next */
 if (transportVersion.includes('-')) {
   // clean prerelease
diff --git a/src/helpers.ts b/src/helpers.ts
index a099543..739ddef 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -21,9 +21,9 @@
 /* eslint-disable @typescript-eslint/promise-function-async */
 /* eslint-disable @typescript-eslint/no-unnecessary-type-assertion */
 
-import assert from 'assert'
-import { promisify } from 'util'
-import { Readable } from 'stream'
+import assert from 'node:assert'
+import * as timersPromises from 'node:timers/promises'
+import { Readable } from 'node:stream'
 import { errors, TransportResult, TransportRequestOptions, TransportRequestOptionsWithMeta } from '@elastic/transport'
 import Client from './client'
 import * as T from './api/types'
@@ -162,8 +162,8 @@ export interface EsqlToRecords<TDocument> {
 }
 
 const { ResponseError, ConfigurationError } = errors
-const sleep = promisify(setTimeout)
-const pImmediate = promisify(setImmediate)
+const sleep = timersPromises.setTimeout
+const pImmediate = timersPromises.setImmediate
 /* istanbul ignore next */
 const noop = (): void => {}
 const kClient = Symbol('elasticsearch-client')
diff --git a/test/integration/helper.js b/test/integration/helper.js
index d582525..fe4e0b4 100644
--- a/test/integration/helper.js
+++ b/test/integration/helper.js
@@ -19,7 +19,7 @@
 
 'use strict'
 
-const assert = require('assert')
+const assert = require('node:assert')
 const fetch = require('node-fetch')
 
 function runInParallel (client, operation, options, clientOptions) {
diff --git a/test/integration/helpers/bulk.test.js b/test/integration/helpers/bulk.test.js
index 011f524..a1b2be1 100644
--- a/test/integration/helpers/bulk.test.js
+++ b/test/integration/helpers/bulk.test.js
@@ -19,8 +19,8 @@
 
 'use strict'
 
-const { createReadStream } = require('fs')
-const { join } = require('path')
+const { createReadStream } = require('node:fs')
+const { join } = require('node:path')
 const split = require('split2')
 const { test, beforeEach, afterEach } = require('tap')
 const { waitCluster } = require('../../utils')
diff --git a/test/integration/helpers/msearch.test.js b/test/integration/helpers/msearch.test.js
index c9c726e..fb317b0 100644
--- a/test/integration/helpers/msearch.test.js
+++ b/test/integration/helpers/msearch.test.js
@@ -19,8 +19,8 @@
 
 'use strict'
 
-const { createReadStream } = require('fs')
-const { join } = require('path')
+const { createReadStream } = require('node:fs')
+const { join } = require('node:path')
 const split = require('split2')
 const { test, beforeEach, afterEach } = require('tap')
 const { waitCluster } = require('../../utils')
diff --git a/test/integration/helpers/scroll.test.js b/test/integration/helpers/scroll.test.js
index e197ce2..36f3b85 100644
--- a/test/integration/helpers/scroll.test.js
+++ b/test/integration/helpers/scroll.test.js
@@ -19,8 +19,8 @@
 
 'use strict'
 
-const { createReadStream } = require('fs')
-const { join } = require('path')
+const { createReadStream } = require('node:fs')
+const { join } = require('node:path')
 const split = require('split2')
 const { test, beforeEach, afterEach } = require('tap')
 const { waitCluster } = require('../../utils')
diff --git a/test/integration/helpers/search.test.js b/test/integration/helpers/search.test.js
index d4aa57c..7a6946a 100644
--- a/test/integration/helpers/search.test.js
+++ b/test/integration/helpers/search.test.js
@@ -19,8 +19,8 @@
 
 'use strict'
 
-const { createReadStream } = require('fs')
-const { join } = require('path')
+const { createReadStream } = require('node:fs')
+const { join } = require('node:path')
 const split = require('split2')
 const { test, beforeEach, afterEach } = require('tap')
 const { waitCluster } = require('../../utils')
diff --git a/test/integration/reporter.js b/test/integration/reporter.js
index 5db288b..d94e09b 100644
--- a/test/integration/reporter.js
+++ b/test/integration/reporter.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const assert = require('assert')
+const assert = require('node:assert')
 const { create } = require('xmlbuilder2')
 
 function createJunitReporter () {
diff --git a/test/unit/helpers/bulk.test.ts b/test/unit/helpers/bulk.test.ts
index 2f776c7..db86280 100644
--- a/test/unit/helpers/bulk.test.ts
+++ b/test/unit/helpers/bulk.test.ts
@@ -18,12 +18,12 @@
  */
 
 import FakeTimers from '@sinonjs/fake-timers'
-import { AssertionError } from 'assert'
-import { createReadStream } from 'fs'
-import * as http from 'http'
-import { join } from 'path'
+import { AssertionError } from 'node:assert'
+import { createReadStream } from 'node:fs'
+import * as http from 'node:http'
+import { join } from 'node:path'
 import split from 'split2'
-import { Readable } from 'stream'
+import { Readable } from 'node:stream'
 import { test } from 'tap'
 import { Client, errors } from '../../../'
 import { buildServer, connection } from '../../utils'
@@ -956,11 +956,11 @@ test('bulk index', t => {
       onDocument (doc) {
         t.type(doc.user, 'string') // testing that doc is type of Document
         return [
-          { 
-            index: { 
-              _index: 'test' 
-            } 
-          }, 
+          {
+            index: {
+              _index: 'test'
+            }
+          },
           { ...doc, updatedAt }
         ]
       },
@@ -1064,7 +1064,7 @@ test('bulk create', t => {
               _index: 'test',
               _id: String(id++)
             }
-          }, 
+          },
           { ...doc, updatedAt }
         ]
       },
diff --git a/test/unit/helpers/search.test.ts b/test/unit/helpers/search.test.ts
index 697237e..9ed4605 100644
--- a/test/unit/helpers/search.test.ts
+++ b/test/unit/helpers/search.test.ts
@@ -108,4 +108,5 @@ test('Merge filter paths (snake_case)', async t => {
     { two: 'two' },
     { three: 'three' }
   ])
-})
\ No newline at end of file
+})
+
diff --git a/test/utils/buildCluster.ts b/test/utils/buildCluster.ts
index 31299b3..266ebef 100644
--- a/test/utils/buildCluster.ts
+++ b/test/utils/buildCluster.ts
@@ -18,7 +18,7 @@
  */
 
 import Debug from 'debug'
-import * as http from 'http'
+import * as http from 'node:http'
 import buildServer, { ServerHandler } from './buildServer'
 import { StoppableServer } from 'stoppable'