diff --git a/index.js b/index.js
index 7ac74fb..75184f5 100644
--- a/index.js
+++ b/index.js
@@ -11,29 +11,39 @@ const rmP = pify(rimraf);
 const input = Symbol('inputPath');
 const output = Symbol('outputPath');
 
-module.exports = opts => {
-	opts = Object.assign({}, opts);
+module.exports = options => {
+	options = Object.assign({}, options);
 
-	if (!Buffer.isBuffer(opts.input)) {
+	if (!Buffer.isBuffer(options.input)) {
 		return Promise.reject(new Error('Input is required'));
 	}
 
-	if (typeof opts.bin !== 'string') {
+	if (typeof options.bin !== 'string') {
 		return Promise.reject(new Error('Binary is required'));
 	}
 
-	if (!Array.isArray(opts.args)) {
+	if (!Array.isArray(options.args)) {
 		return Promise.reject(new Error('Arguments are required'));
 	}
 
-	const inputPath = opts.inputPath || tempfile();
-	const outputPath = opts.outputPath || tempfile();
+	const inputPath = options.inputPath || tempfile();
+	const outputPath = options.outputPath || tempfile();
 
-	opts.args = opts.args.map(x => x === input ? inputPath : x === output ? outputPath : x);
+	options.args = options.args.map(x => {
+		if (x === input) {
+			return inputPath;
+		}
 
-	const promise = fsP.writeFile(inputPath, opts.input)
-		.then(() => execa(opts.bin, opts.args))
-		.then(() => fsP.readFile(outputPath));
+		if (x === output) {
+			return outputPath;
+		}
+
+		return x;
+	});
+
+	const promise = fsP.writeFile(inputPath, options.input)
+		.then(() => execa(options.bin, options.args)) // eslint-disable-line promise/prefer-await-to-then
+		.then(() => fsP.readFile(outputPath)); // eslint-disable-line promise/prefer-await-to-then
 
 	return pFinally(promise, () => Promise.all([
 		rmP(inputPath),
diff --git a/package.json b/package.json
index 2c3b6d9..39c42d2 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
 		"url": "https://github.com/kevva"
 	},
 	"engines": {
-		"node": ">=4"
+		"node": ">=7.6.0"
 	},
 	"scripts": {
 		"test": "xo && ava"
@@ -23,17 +23,23 @@
 		"exec"
 	],
 	"dependencies": {
-		"execa": "^0.7.0",
-		"p-finally": "^1.0.0",
-		"pify": "^3.0.0",
-		"rimraf": "^2.5.4",
-		"tempfile": "^2.0.0"
+		"execa": "^5.0.0",
+		"p-finally": "^2.0.1",
+		"pify": "^5.0.0",
+		"rimraf": "^3.0.2",
+		"tempfile": "^3.0.0"
 	},
 	"devDependencies": {
-		"ava": "*",
-		"gifsicle": "^3.0.4",
-		"is-gif": "^1.0.0",
-		"path-exists": "^3.0.0",
-		"xo": "*"
+		"ava": "^3.15.0",
+		"esm": "^3.2.25",
+		"gifsicle": "^5.1.0",
+		"is-gif": "^3.0.0",
+		"path-exists": "^4.0.0",
+		"xo": "^0.37.1"
+	},
+	"ava": {
+		"require": [
+			"esm"
+		]
 	}
 }
diff --git a/test.js b/test.js
index 67c0b92..d445246 100644
--- a/test.js
+++ b/test.js
@@ -5,7 +5,7 @@ import isGif from 'is-gif';
 import pathExists from 'path-exists';
 import pify from 'pify';
 import test from 'ava';
-import m from './';
+import m from './index.js';
 
 test('set temporary directories', t => {
 	const {input, output} = m;
@@ -27,13 +27,13 @@ test('return a optimized buffer', async t => {
 
 test('remove temporary files', async t => {
 	const buf = await pify(fs.readFile)(path.join(__dirname, 'fixture.gif'));
-	const err = await t.throws(m({
+	const error = await t.throwsAsync(m({
 		input: buf,
 		bin: 'foobarunicorn',
 		args: [m.output, m.input]
 	}));
 
-	t.is(err.code, 'ENOENT');
-	t.false(await pathExists(err.spawnargs[0]));
-	t.false(await pathExists(err.spawnargs[1]));
+	t.is(error.code, 'ENOENT');
+	t.false(await pathExists(error.spawnargs[0]));
+	t.false(await pathExists(error.spawnargs[1]));
 });