diff --git a/HISTORY.md b/HISTORY.md
index f61051e..77984c1 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,8 @@
+1.0.4 / 2022-09-16
+==================
+
+  * build: support ESM module system
+
 1.0.3 / 2015-09-01
 ==================
 
diff --git a/README.md b/README.md
index 2557666..9a676b8 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,8 @@ The `escapeHtml` function is designed to accept a string input of text and
 return an escaped value to interpolate into HTML.
 
 ```js
-var escapeHtml = require('escape-html')
+var escapeHtml = require('escape-html') // CommonJS require
+// import escapeHtml from 'escape-html' // ESM import
 
 // example values
 var desc = 'I <b>think</b> this is good.'
diff --git a/index.mjs b/index.mjs
new file mode 100644
index 0000000..5a7533f
--- /dev/null
+++ b/index.mjs
@@ -0,0 +1,78 @@
+/*!
+ * escape-html
+ * Copyright(c) 2012-2013 TJ Holowaychuk
+ * Copyright(c) 2015 Andreas Lubbe
+ * Copyright(c) 2015 Tiancheng "Timothy" Gu
+ * MIT Licensed
+ */
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var matchHtmlRegExp = /["'&<>]/;
+
+/**
+ * Module exports.
+ * @public
+ */
+
+var oss = escapeHtml;
+
+/**
+ * Escape special characters in the given string of text.
+ *
+ * @param  {string} string The string to escape for inserting into HTML
+ * @return {string}
+ * @public
+ */
+
+function escapeHtml (string) {
+  var str = '' + string;
+  var match = matchHtmlRegExp.exec(str);
+
+  if (!match) {
+    return str
+  }
+
+  var escape;
+  var html = '';
+  var index = 0;
+  var lastIndex = 0;
+
+  for (index = match.index; index < str.length; index++) {
+    switch (str.charCodeAt(index)) {
+      case 34: // "
+        escape = '&quot;';
+        break
+      case 38: // &
+        escape = '&amp;';
+        break
+      case 39: // '
+        escape = '&#39;';
+        break
+      case 60: // <
+        escape = '&lt;';
+        break
+      case 62: // >
+        escape = '&gt;';
+        break
+      default:
+        continue
+    }
+
+    if (lastIndex !== index) {
+      html += str.substring(lastIndex, index);
+    }
+
+    lastIndex = index + 1;
+    html += escape;
+  }
+
+  return lastIndex !== index
+    ? html + str.substring(lastIndex, index)
+    : html
+}
+
+export { oss as default };
diff --git a/package.json b/package.json
index b46dd7e..dd57f56 100644
--- a/package.json
+++ b/package.json
@@ -9,9 +9,16 @@
     "utility"
   ],
   "repository": "component/escape-html",
+  "exports": {
+    ".": {
+        "require": "./index.js",
+        "import": "./index.mjs"
+      }
+  },
   "devDependencies": {
-    "benchmark": "2.1.4",
+    "@rollup/plugin-commonjs": "^22.0.2",
     "beautify-benchmark": "0.2.4",
+    "benchmark": "2.1.4",
     "eslint": "5.12.0",
     "eslint-config-standard": "12.0.0",
     "eslint-plugin-import": "2.14.0",
@@ -20,7 +27,8 @@
     "eslint-plugin-promise": "4.0.1",
     "eslint-plugin-standard": "4.0.0",
     "mocha": "5.2.0",
-    "nyc": "13.1.0"
+    "nyc": "13.1.0",
+    "rollup": "^2.79.0"
   },
   "files": [
     "HISTORY.md",
@@ -32,6 +40,7 @@
     "bench": "node benchmark/index.js",
     "lint": "eslint --plugin markdown --ext js,md .",
     "test": "mocha test/",
-    "test-cov": "nyc --reporter=html --reporter=text npm test"
+    "test-cov": "nyc --reporter=html --reporter=text npm test",
+    "roll": "rollup --config rollup.config.mjs"
   }
 }
diff --git a/rollup.config.mjs b/rollup.config.mjs
new file mode 100644
index 0000000..1676993
--- /dev/null
+++ b/rollup.config.mjs
@@ -0,0 +1,11 @@
+import { defineConfig } from "rollup";
+import commonjs from "@rollup/plugin-commonjs";
+
+export default defineConfig({
+  input: "./index.js",
+  output: {
+    file: "index.mjs",
+    format: "es",
+  },
+  plugins: [commonjs()],
+});