diff --git a/package-lock.json b/package-lock.json
index 8c981265cb53..731b6ef2e6da 100644
--- a/package-lock.json
+++ b/package-lock.json
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       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
     },
     "worker-farm": {
       "version": "1.7.0",
@@ -22216,6 +22313,7 @@
       "version": "2.10.0",
       "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
       "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "dev": true,
       "requires": {
         "buffer-crc32": "~0.2.3",
         "fd-slicer": "~1.1.0"
diff --git a/package.json b/package.json
index 6d5aea956e53..b5c98aff91dc 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,6 @@
     "html-truncate": "^1.2.2",
     "imurmurhash": "^0.1.4",
     "instantsearch.js": "^3.6.0",
-    "is-port-available": "^0.1.5",
     "is-url": "^1.2.4",
     "js-cookie": "^2.2.1",
     "js-yaml": "^3.14.0",
@@ -52,8 +51,8 @@
     "mkdirp": "^1.0.3",
     "morgan": "^1.9.1",
     "node-fetch": "^2.6.1",
-    "pa11y-ci": "^2.3.0",
     "platform-utils": "^1.2.0",
+    "port-used": "^2.0.8",
     "querystring": "^0.2.0",
     "readline-sync": "^1.4.10",
     "resolve-url-loader": "^3.1.1",
@@ -102,6 +101,7 @@
     "nodemon": "^2.0.4",
     "npm-merge-driver-install": "^1.1.1",
     "object-hash": "^2.0.1",
+    "pa11y-ci": "^2.3.0",
     "puppeteer": "^2.1.1",
     "replace": "^1.2.0",
     "revalidator": "^0.3.1",
diff --git a/server.js b/server.js
index 998debcc2bb5..5cf817bdb434 100644
--- a/server.js
+++ b/server.js
@@ -3,7 +3,7 @@ require('./lib/handle-exceptions')
 require('./lib/feature-flags')
 
 const express = require('express')
-const isPortAvailable = require('is-port-available')
+const portUsed = require('port-used')
 const warmServer = require('./lib/warm-server')
 const port = Number(process.env.PORT) || 4000
 const app = express()
@@ -14,8 +14,8 @@ require('./middleware')(app)
 /* istanbul ignore next */
 if (!module.parent) {
   // check that the development server is not already running
-  isPortAvailable(port).then(async status => {
-    if (status) {
+  portUsed.check(port).then(async status => {
+    if (status === false) {
       // If in production, warm the server at the start
       if (process.env.NODE_ENV === 'production') await warmServer()