diff --git a/.travis.yml b/.travis.yml
index dedfc07..ea4c8c5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,4 +3,3 @@ language: node_js
 node_js:
   - 'iojs'
   - '0.12'
-  - '0.10'
diff --git a/index.js b/index.js
index ef4dc2d..2083294 100644
--- a/index.js
+++ b/index.js
@@ -1,49 +1,52 @@
 'use strict';
+var stdin = process.stdin;
 
-module.exports = function (cb) {
-	var stdin = process.stdin;
+module.exports = function () {
 	var ret = '';
 
-	if (stdin.isTTY) {
-		setImmediate(cb, ret);
-		return;
-	}
+	return new Promise(function (resolve) {
+		if (stdin.isTTY) {
+			resolve(ret);
+			return;
+		}
 
-	stdin.setEncoding('utf8');
+		stdin.setEncoding('utf8');
 
-	stdin.on('readable', function () {
-		var chunk;
+		stdin.on('readable', function () {
+			var chunk;
 
-		while (chunk = stdin.read()) {
-			ret += chunk;
-		}
-	});
+			while ((chunk = stdin.read())) {
+				ret += chunk;
+			}
+		});
 
-	stdin.on('end', function () {
-		cb(ret);
+		stdin.on('end', function () {
+			resolve(ret);
+		});
 	});
 };
 
-module.exports.buffer = function (cb) {
-	var stdin = process.stdin;
+module.exports.buffer = function () {
 	var ret = [];
 	var len = 0;
 
-	if (stdin.isTTY) {
-		setImmediate(cb, new Buffer(''));
-		return;
-	}
+	return new Promise(function (resolve) {
+		if (stdin.isTTY) {
+			resolve(new Buffer(''));
+			return;
+		}
 
-	stdin.on('readable', function () {
-		var chunk;
+		stdin.on('readable', function () {
+			var chunk;
 
-		while (chunk = stdin.read()) {
-			ret.push(chunk);
-			len += chunk.length;
-		}
-	});
+			while ((chunk = stdin.read())) {
+				ret.push(chunk);
+				len += chunk.length;
+			}
+		});
 
-	stdin.on('end', function () {
-		cb(Buffer.concat(ret, len));
+		stdin.on('end', function () {
+			resolve(Buffer.concat(ret, len));
+		});
 	});
 };
diff --git a/package.json b/package.json
index 9a3e42a..749f169 100644
--- a/package.json
+++ b/package.json
@@ -7,13 +7,13 @@
   "author": {
     "name": "Sindre Sorhus",
     "email": "sindresorhus@gmail.com",
-    "url": "http://sindresorhus.com"
+    "url": "sindresorhus.com"
   },
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=0.12.0"
   },
   "scripts": {
-    "test": "node test.js && node test-buffer.js && echo unicorns | node test-real.js"
+    "test": "ava test.js test-buffer.js && echo unicorns | ava test-real.js"
   },
   "files": [
     "index.js"
@@ -29,7 +29,7 @@
     "stream"
   ],
   "devDependencies": {
-    "ava": "0.0.4",
+    "ava": "*",
     "buffer-equal": "0.0.1"
   }
 }
diff --git a/readme.md b/readme.md
index bc1d32a..79976b4 100644
--- a/readme.md
+++ b/readme.md
@@ -5,7 +5,7 @@
 
 ## Install
 
-```sh
+```
 $ npm install --save get-stdin
 ```
 
@@ -14,15 +14,15 @@ $ npm install --save get-stdin
 
 ```js
 // example.js
-var stdin = require('get-stdin');
+const stdin = require('get-stdin');
 
-stdin(function (data) {
+stdin.then(data => {
 	console.log(data);
-	//=> unicorns
+	//=> 'unicorns'
 });
 ```
 
-```sh
+```
 $ echo unicorns | node example.js
 unicorns
 ```
@@ -30,14 +30,18 @@ unicorns
 
 ## API
 
-### stdin(callback)
+### stdin()
 
 Get `stdin` as a string.
 
-### stdin.buffer(callback)
+Returns a promise.
+
+### stdin.buffer()
 
 Get `stdin` as a buffer.
 
+Returns a promise.
+
 
 ## License
 
diff --git a/test-buffer.js b/test-buffer.js
index 799e907..a98e0fc 100644
--- a/test-buffer.js
+++ b/test-buffer.js
@@ -4,24 +4,23 @@ var bufferEqual = require('buffer-equal');
 var stdin = require('./');
 
 test('get stdin as a buffer', function (t) {
-	t.plan(2);
 	process.stdin.isTTY = false;
 
-	stdin.buffer(function (data) {
-		t.assert(bufferEqual(data, new Buffer('unicorns')));
-		t.assert(data.toString().trim() === 'unicorns');
+	var promise = stdin.buffer(function (data) {
+		t.true(bufferEqual(data, new Buffer('unicorns')));
+		t.is(data.toString().trim(), 'unicorns');
 	});
 
 	process.stdin.push(new Buffer('unicorns'));
 	process.stdin.emit('end');
+
+	return promise;
 });
 
 test('get empty buffer when no stdin', function (t) {
-	t.plan(1);
 	process.stdin.isTTY = true;
 
-	stdin.buffer(function (data) {
-		t.assert(bufferEqual(data, new Buffer('')));
+	return stdin.buffer(function (data) {
+		t.true(bufferEqual(data, new Buffer('')));
 	});
 });
-
diff --git a/test-real.js b/test-real.js
index c6b63d3..8ae6760 100644
--- a/test-real.js
+++ b/test-real.js
@@ -1,6 +1,6 @@
 'use strict';
 var stdin = require('./');
 
-stdin(function (data) {
+stdin().then(function (data) {
 	process.exit(data ? 0 : 1);
 });
diff --git a/test.js b/test.js
index b2734f7..43139eb 100644
--- a/test.js
+++ b/test.js
@@ -3,22 +3,22 @@ var test = require('ava');
 var stdin = require('./');
 
 test('get stdin', function (t) {
-	t.plan(1);
 	process.stdin.isTTY = false;
 
-	stdin(function (data) {
-		t.assert(data.trim() === 'unicorns');
+	var promise = stdin(function (data) {
+		t.is(data.trim(), 'unicorns');
 	});
 
 	process.stdin.push('unicorns');
 	process.stdin.emit('end');
+
+	return promise;
 });
 
 test('get empty string when no stdin', function (t) {
-	t.plan(1);
 	process.stdin.isTTY = true;
 
-	stdin(function (data) {
-		t.assert(data === '');
+	return stdin(function (data) {
+		t.is(data, '');
 	});
 });