diff --git a/.appveyor.yml b/.appveyor.yml
index bc20403..071d68c 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -2,6 +2,7 @@ build: off
 
 environment:
   matrix:
+    - nodejs_version: '20'
     - nodejs_version: '18'
     - nodejs_version: '16'
     - nodejs_version: '14'
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 8073209..2e4dde2 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: ["14.x", "16.x", "18.x"]
+        node-version: ["14.x", "16.x", "18.x", "20.x"]
 
     steps:
     - uses: actions/checkout@v2
@@ -29,7 +29,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: ["14.x", "16.x", "18.x"]
+        node-version: ["14.x", "16.x", "18.x", "20.x"]
 
     steps:
     - uses: actions/checkout@v2
@@ -37,5 +37,7 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
+    - if: matrix.node-version == '14.x'
+      run: npm install -g npm@9 # node 14 comes with npm 6, which has some known bugs with dependency resolution
     - run: npm i
     - run: npm test
diff --git a/.travis.yml b/.travis.yml
index 25d33de..a4ebd4d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ jobs:
       script: npm run lint
 language: node_js
 node_js:
+  - 20
   - 18
   - 16
   - 14
diff --git a/lib/index.js b/lib/index.js
index b4ecea6..7a3a761 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -100,7 +100,9 @@ module.exports = function (
 
     const loaderURL = pathToFileURL(resolveMain(localPath(join('loaders', `${loaderName}.mjs`))));
 
-    args.push(`--experimental-loader=${loaderURL.href}`);
+    if (!semver.satisfies(process.version, '>=21.0.0')) {
+      args.push(`--experimental-loader=${loaderURL.href}`);
+    }
 
     child = fork(script, scriptArgs, {
       cwd: process.cwd(),
diff --git a/lib/loaders/ipc.mjs b/lib/loaders/ipc.mjs
index 61c48c4..8fc1aad 100644
--- a/lib/loaders/ipc.mjs
+++ b/lib/loaders/ipc.mjs
@@ -3,3 +3,7 @@ const cmd = 'NODE_DEV';
 export const send = m => {
   if (process.connected) process.send({ ...m, cmd });
 };
+
+export const sendPort = (port, m) => {
+  if (port) port.postMessage({ ...m, cmd });
+};
diff --git a/lib/loaders/load.mjs b/lib/loaders/load.mjs
index 2772f60..b592a88 100644
--- a/lib/loaders/load.mjs
+++ b/lib/loaders/load.mjs
@@ -1,13 +1,17 @@
 import { createRequire } from 'module';
 import { fileURLToPath } from 'url';
-import { send } from './ipc.mjs';
+import { sendPort } from './ipc.mjs';
 
 const require = createRequire(import.meta.url);
 
+// Port used for communication between the loader and ESM modules
+// https://nodejs.org/api/esm.html#globalpreload
+let port;
+
 export async function load(url, context, defaultLoad) {
   const required = url.startsWith('file://') ? fileURLToPath(url) : url;
 
-  send({ required });
+  sendPort(port, { required });
 
   try {
     return await defaultLoad(url, context, defaultLoad);
@@ -19,3 +23,20 @@ export async function load(url, context, defaultLoad) {
     });
   }
 }
+
+export const globalPreload = (context) => {
+  // Store port
+  port = context.port;
+
+  // Inject code to forward loader events to the parent
+  return `
+port.on('message', (m) => {
+  if (process.connected) process.send(m);
+}).unref();
+  `;
+};
+
+export const initialize = (context) => {
+  // Store port
+  port = context.port;
+};
diff --git a/lib/wrap.js b/lib/wrap.js
index 7889ea5..aa0e868 100755
--- a/lib/wrap.js
+++ b/lib/wrap.js
@@ -2,6 +2,10 @@ const { dirname, extname } = require('path');
 const childProcess = require('child_process');
 const { sync: resolve } = require('resolve');
 const { isMainThread } = require('worker_threads');
+const { register } = require('node:module');
+const { pathToFileURL } = require('node:url');
+const semver = require('semver');
+const { MessageChannel } = require('node:worker_threads');
 
 const { getConfig } = require('./cfg');
 const hook = require('./hook');
@@ -73,3 +77,21 @@ if (typeof mod === 'object' && mod.name) {
 } else if (typeof mod === 'string') {
   require(resolve(mod, { basedir }));
 }
+
+if (semver.satisfies(process.version, '>=21.0.0')) {
+  // This example showcases how a message channel can be used to
+  // communicate with the hooks, by sending `port2` to the hooks.
+  const { port1, port2 } = new MessageChannel();
+
+  port1
+    .on('message', m => {
+      if (process.connected) process.send(m);
+    })
+    .unref();
+
+  register('./loaders/load.mjs', {
+    parentURL: pathToFileURL(__filename),
+    data: { port: port2 },
+    transferList: [port2]
+  });
+}
diff --git a/test/fixture/experimental-specifier-resolution/index.mjs b/test/fixture/experimental-specifier-resolution/index.mjs
deleted file mode 100644
index 0ac70ad..0000000
--- a/test/fixture/experimental-specifier-resolution/index.mjs
+++ /dev/null
@@ -1 +0,0 @@
-export default 'experimental-specifier-resolution';
diff --git a/test/fixture/resolution.mjs b/test/fixture/resolution.mjs
deleted file mode 100644
index c4d373c..0000000
--- a/test/fixture/resolution.mjs
+++ /dev/null
@@ -1,7 +0,0 @@
-import resolution from './experimental-specifier-resolution';
-import message from './message';
-
-setTimeout(() => {}, 10000);
-
-console.log(resolution);
-console.log(message);
diff --git a/test/spawn/esmodule.js b/test/spawn/esmodule.js
index 1b6b816..1fa2c5f 100644
--- a/test/spawn/esmodule.js
+++ b/test/spawn/esmodule.js
@@ -2,20 +2,6 @@ const tap = require('tap');
 
 const { spawn, touchFile } = require('../utils');
 
-tap.test('Supports ECMAScript modules with experimental-specifier-resolution', t => {
-  spawn('--experimental-specifier-resolution=node resolution.mjs', out => {
-    if (out.match(/touch message.js/)) {
-      touchFile('message.js');
-      return out2 => {
-        if (out2.match(/Restarting/)) {
-          t.match(out2, /\[INFO\] \d{2}:\d{2}:\d{2} Restarting/);
-          return { exit: t.end.bind(t) };
-        }
-      };
-    }
-  });
-});
-
 tap.test('Supports ECMAScript modules', t => {
   spawn('ecma-script-modules.mjs', out => {
     if (out.match(/touch message.mjs/)) {