diff --git a/packages/react-cookie/package.json b/packages/react-cookie/package.json
index 214960a..4010843 100644
--- a/packages/react-cookie/package.json
+++ b/packages/react-cookie/package.json
@@ -3,16 +3,16 @@
   "version": "7.1.1",
   "description": "Universal cookies for React",
   "main": "cjs/index.js",
-  "types": "cjs/index.d.ts",
+  "types": "cjs/index.d.mts",
   "module": "esm/index.mjs",
   "exports": {
     ".": {
       "import": {
-        "types": "./esm/index.d.ts",
+        "types": "./esm/index.d.mts",
         "default": "./esm/index.mjs"
       },
       "require": {
-        "types": "./cjs/index.d.ts",
+        "types": "./cjs/index.d.mts",
         "default": "./cjs/index.js"
       },
       "default": "./cjs/index.js"
@@ -23,7 +23,7 @@
     "esm",
     "cjs",
     "umd",
-    "index.d.ts",
+    "index.d.mts",
     "LICENSE"
   ],
   "repository": {
@@ -42,7 +42,8 @@
   "license": "MIT",
   "scripts": {
     "prebuild": "rimraf esm && rimraf cjs && rimraf umd",
-    "build": "rollup -c"
+    "build": "rollup -c",
+    "postbuild": "node ../../tools/fix-typescript-typedef.mjs ./esm"
   },
   "dependencies": {
     "@types/hoist-non-react-statics": "^3.3.5",
diff --git a/packages/react-cookie/rollup.esm.mjs b/packages/react-cookie/rollup.esm.mjs
deleted file mode 100644
index 952596f..0000000
--- a/packages/react-cookie/rollup.esm.mjs
+++ /dev/null
@@ -1,25 +0,0 @@
-import glob from 'glob';
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-import typescript from '@rollup/plugin-typescript';
-
-export default {
-  input: Object.fromEntries(
-    glob
-      .sync('src/**/*.{ts,tsx}')
-      .map((file) => [
-        path.relative(
-          'src',
-          file.slice(0, file.length - path.extname(file).length),
-        ),
-        fileURLToPath(new URL(file, import.meta.url)),
-      ]),
-  ),
-  output: {
-    dir: './esm',
-    format: 'esm',
-    entryFileNames: '[name].mjs',
-  },
-  plugins: [typescript()],
-  external: ['react', 'universal-cookie', 'hoist-non-react-statics'],
-};
diff --git a/packages/universal-cookie-express/package.json b/packages/universal-cookie-express/package.json
index a85bf8c..78e2578 100644
--- a/packages/universal-cookie-express/package.json
+++ b/packages/universal-cookie-express/package.json
@@ -3,16 +3,16 @@
   "version": "7.1.1",
   "description": "Hook cookies get/set on Express for server-rendering",
   "main": "cjs/index.js",
-  "types": "cjs/index.d.ts",
+  "types": "cjs/index.d.mts",
   "module": "esm/index.mjs",
   "exports": {
     ".": {
       "import": {
-        "types": "./esm/index.d.ts",
+        "types": "./esm/index.d.mts",
         "default": "./esm/index.mjs"
       },
       "require": {
-        "types": "./cjs/index.d.ts",
+        "types": "./cjs/index.d.mts",
         "default": "./cjs/index.js"
       },
       "default": "./cjs/index.js"
@@ -40,7 +40,8 @@
   "license": "MIT",
   "scripts": {
     "prebuild": "rimraf esm && rimraf cjs",
-    "build": "rollup -c"
+    "build": "rollup -c",
+    "postbuild": "node ../../tools/fix-typescript-typedef.mjs ./esm"
   },
   "dependencies": {
     "universal-cookie": "^7.0.0"
diff --git a/packages/universal-cookie-koa/package.json b/packages/universal-cookie-koa/package.json
index 7d196fe..2a6b2aa 100644
--- a/packages/universal-cookie-koa/package.json
+++ b/packages/universal-cookie-koa/package.json
@@ -3,16 +3,16 @@
   "version": "7.1.1",
   "description": "Hook cookies get/set on Koa for server-rendering",
   "main": "cjs/index.js",
-  "types": "cjs/index.d.ts",
+  "types": "cjs/index.d.mts",
   "module": "esm/index.mjs",
   "exports": {
     ".": {
       "import": {
-        "types": "./esm/index.d.ts",
+        "types": "./esm/index.d.mts",
         "default": "./esm/index.mjs"
       },
       "require": {
-        "types": "./cjs/index.d.ts",
+        "types": "./cjs/index.d.mts",
         "default": "./cjs/index.js"
       },
       "default": "./cjs/index.js"
@@ -40,7 +40,8 @@
   "license": "MIT",
   "scripts": {
     "prebuild": "rimraf esm && rimraf cjs",
-    "build": "rollup -c"
+    "build": "rollup -c",
+    "postbuild": "node ../../tools/fix-typescript-typedef.mjs ./esm"
   },
   "dependencies": {
     "universal-cookie": "^7.0.0"
diff --git a/packages/universal-cookie/index.d.ts b/packages/universal-cookie/index.d.ts
deleted file mode 100644
index e660210..0000000
--- a/packages/universal-cookie/index.d.ts
+++ /dev/null
@@ -1 +0,0 @@
-export * from './esm';
diff --git a/packages/universal-cookie/package.json b/packages/universal-cookie/package.json
index 1d9e020..0518f5e 100644
--- a/packages/universal-cookie/package.json
+++ b/packages/universal-cookie/package.json
@@ -2,16 +2,16 @@
   "name": "universal-cookie",
   "version": "7.1.1",
   "description": "Universal cookies for JavaScript",
-  "types": "cjs/index.d.ts",
+  "types": "cjs/index.d.mts",
   "module": "esm/index.mjs",
   "exports": {
     ".": {
       "import": {
-        "types": "./esm/index.d.ts",
+        "types": "./esm/index.d.mts",
         "default": "./esm/index.mjs"
       },
       "require": {
-        "types": "./cjs/index.d.ts",
+        "types": "./cjs/index.d.mts",
         "default": "./cjs/index.js"
       },
       "default": "./cjs/index.js"
@@ -22,7 +22,7 @@
     "esm",
     "cjs",
     "umd",
-    "index.d.ts",
+    "index.d.mts",
     "LICENSE"
   ],
   "repository": {
@@ -40,7 +40,8 @@
   "license": "MIT",
   "scripts": {
     "prebuild": "rimraf esm && rimraf cjs && rimraf umd",
-    "build": "rollup -c"
+    "build": "rollup -c",
+    "postbuild": "node ../../tools/fix-typescript-typedef.mjs ./esm"
   },
   "dependencies": {
     "@types/cookie": "^0.6.0",
diff --git a/tools/fix-typescript-typedef.mjs b/tools/fix-typescript-typedef.mjs
new file mode 100644
index 0000000..fd26ae3
--- /dev/null
+++ b/tools/fix-typescript-typedef.mjs
@@ -0,0 +1,31 @@
+// When using ESM, the default export won't work unless we use .d.mts instead of .d.ts extension
+import fs from 'fs/promises';
+import path from 'path';
+
+if (process.argv.length < 3) {
+  throw new Error('Missing folder');
+}
+
+const folder = process.argv[2];
+console.log(folder);
+const extLength = '.m.ts'.length;
+
+const files = await fs.readdir(folder);
+const promises = files
+  .filter((file) => /\.d\.ts$/.test(file))
+  .map(async (file) => {
+    const fullFile = path.join(folder, file);
+    const newFullFile = `${fullFile.substring(0, fullFile.length - extLength)}.d.mts`;
+
+    await fs.rename(fullFile, newFullFile);
+
+    const content = (await fs.readFile(newFullFile)).toString();
+    const newContent = content.replaceAll(
+      / from \'([^']+)\'/g,
+      ` from '$1.d.mts'`,
+    );
+
+    await fs.writeFile(newFullFile, newContent);
+  });
+
+await Promise.all(promises);