diff --git a/esbuild.js b/esbuild.js
new file mode 100644
index 0000000..855f245
--- /dev/null
+++ b/esbuild.js
@@ -0,0 +1,19 @@
+const { build } = require('esbuild');
+
+const common = {
+  entryPoints: ['./oddslib.mjs'],
+  bundle: true,
+  platform: 'node',
+};
+
+build({
+  ...common,
+  outfile: 'dist/oddslib.cjs.js',
+});
+
+build({
+  ...common,
+  outfile: 'dist/oddslib.esm.js',
+  format: 'esm'
+});
+    
diff --git a/package-lock.json b/package-lock.json
index 0c0c966..0506e10 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,16 @@
 {
   "name": "oddslib",
-  "version": "1.0.3",
+  "version": "2.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "1.0.3",
+      "version": "2.1.0",
       "license": "MIT",
       "devDependencies": {
         "chai": "^4.3.4",
-        "mocha": "^8.3.2",
-        "rollup": "^2.46.0"
+        "esbuild": "^0.12.19",
+        "mocha": "^8.3.2"
       }
     },
     "node_modules/@ungap/promise-all-settled": {
@@ -351,6 +351,16 @@
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
+    "node_modules/esbuild": {
+      "version": "0.12.19",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.12.19.tgz",
+      "integrity": "sha512-5NuT1G6THW7l3fsSCDkcPepn24R0XtyPjKoqKHD8LfhqMXzCdz0mrS9HgO6hIhzVT7zt0T+JGbzCqF5AH8hS9w==",
+      "dev": true,
+      "hasInstallScript": true,
+      "bin": {
+        "esbuild": "bin/esbuild"
+      }
+    },
     "node_modules/escalade": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
@@ -818,21 +828,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/rollup": {
-      "version": "2.46.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.46.0.tgz",
-      "integrity": "sha512-qPGoUBNl+Z8uNu0z7pD3WPTABWRbcOwIrO/5ccDJzmrtzn0LVf6Lj91+L5CcWhXl6iWf23FQ6m8Jkl2CmN1O7Q==",
-      "dev": true,
-      "bin": {
-        "rollup": "dist/bin/rollup"
-      },
-      "engines": {
-        "node": ">=10.0.0"
-      },
-      "optionalDependencies": {
-        "fsevents": "~2.3.1"
-      }
-    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -1400,6 +1395,12 @@
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
+    "esbuild": {
+      "version": "0.12.19",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.12.19.tgz",
+      "integrity": "sha512-5NuT1G6THW7l3fsSCDkcPepn24R0XtyPjKoqKHD8LfhqMXzCdz0mrS9HgO6hIhzVT7zt0T+JGbzCqF5AH8hS9w==",
+      "dev": true
+    },
     "escalade": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
@@ -1729,15 +1730,6 @@
       "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
       "dev": true
     },
-    "rollup": {
-      "version": "2.46.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.46.0.tgz",
-      "integrity": "sha512-qPGoUBNl+Z8uNu0z7pD3WPTABWRbcOwIrO/5ccDJzmrtzn0LVf6Lj91+L5CcWhXl6iWf23FQ6m8Jkl2CmN1O7Q==",
-      "dev": true,
-      "requires": {
-        "fsevents": "~2.3.1"
-      }
-    },
     "safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
diff --git a/package.json b/package.json
index b933c37..3557323 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,11 @@
 {
   "name": "oddslib",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "description": "Odds conversion and formatting library",
   "main": "dist/oddslib.cjs.js",
   "module": "dist/oddslib.esm.js",
   "scripts": {
-    "build": "rollup -c",
-    "dev": "rollup -c -w",
+    "build": "node ./esbuild.js",
     "test": "mocha --reporter spec"
   },
   "author": "Stéphane Travostino <steph@combo.cc>",
@@ -33,7 +32,7 @@
   },
   "devDependencies": {
     "chai": "^4.3.4",
-    "mocha": "^8.3.2",
-    "rollup": "^2.46.0"
+    "esbuild": "^0.12.19",
+    "mocha": "^8.3.2"
   }
 }
diff --git a/rollup.config.js b/rollup.config.js
deleted file mode 100644
index cf374e3..0000000
--- a/rollup.config.js
+++ /dev/null
@@ -1,11 +0,0 @@
-import pkg from "./package.json";
-
-export default [
-  {
-    input: "oddslib.mjs",
-    output: [
-      { file: pkg.main, format: "cjs" },
-      { file: pkg.module, format: "es" },
-    ],
-  },
-];