diff --git a/package.json b/package.json
index 4bf85db0..efaa1aaa 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,11 @@
   "publishConfig": {
     "access": "public"
   },
-  "main": "LmcCookieConsentManager.js",
+  "module": "LmcCookieConsentManager.esm.js",
+  "browser": {
+    "./LmcCookieConsentManager.js": "./LmcCookieConsentManager.js",
+    "./LmcCookieConsentManager.esm.js": "./LmcCookieConsentManager.esm.js"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/lmc-eu/cookie-consent-manager.git"
diff --git a/scripts/build.js b/scripts/build.js
index fff6451c..47780b4e 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -1,5 +1,6 @@
 const { build } = require('esbuild');
 
+// iife
 build({
   entryPoints: ['src/init.js', 'src/LmcCookieConsentManager.js'],
   bundle: true,
@@ -9,3 +10,21 @@ build({
   console.error(error);
   process.exit(1);
 });
+
+// esm
+build({
+  entryPoints: ['src/LmcCookieConsentManager.js'],
+  bundle: true,
+  target: 'es2017',
+  outfile: 'dist/LmcCookieConsentManager.esm.js',
+  // format: 'esm', // or use platform: neutral and mainFields: ['main']
+  platform: 'neutral', // or use format: 'esm' without  platform and mainFields
+  /**
+   * the "main" field was ignored (main fields must be configured manually when using the "neutral" platform)
+   * because vanilla-cookie-consent is set as `main` in package.json
+   */
+  mainFields: ['main'],
+}).catch((error) => {
+  console.error(error);
+  process.exit(1);
+});