diff --git a/.babelrc b/.babelrc
index ed25dc0..27617a4 100644
--- a/.babelrc
+++ b/.babelrc
@@ -14,5 +14,6 @@
 	"loose": [
 		"es6.classes",
 		"es6.destructuring"
-	]
+	],
+	"compact": false
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1baceb3..eafec5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # rollup changelog
 
+## 0.18.1
+
+* Include `acorn.parse` in bundle, remove `sander` from dependencies, simplify build
+
 ## 0.18.0
 
 * Internal rewrite
diff --git a/browser/fs.js b/browser/fs.js
new file mode 100644
index 0000000..654315f
--- /dev/null
+++ b/browser/fs.js
@@ -0,0 +1,5 @@
+const nope = method => `Cannot use fs.${method} inside browser`;
+
+export const readdirSync = nope( 'readdirSync' );
+export const readFileSync = nope( 'readFileSync' );
+export const writeFile = nope( 'writeFile' );
diff --git a/browser/promise.js b/browser/promise.js
new file mode 100644
index 0000000..06b8309
--- /dev/null
+++ b/browser/promise.js
@@ -0,0 +1 @@
+export default window.Promise;
diff --git a/browser/sander.js b/browser/sander.js
deleted file mode 100644
index 5dbe4fc..0000000
--- a/browser/sander.js
+++ /dev/null
@@ -1,17 +0,0 @@
-export function readdirSync () {
-	throw new Error( 'Cannot use sander.readdirSync inside browser' );
-}
-
-export function readFile () {
-	throw new Error( 'Cannot use sander.readFile inside browser' );
-}
-
-export function readFileSync () {
-	throw new Error( 'Cannot use sander.readFileSync inside browser' );
-}
-
-export function writeFile () {
-	throw new Error( 'Cannot use sander.writeFile inside browser' );
-}
-
-export const Promise = window.Promise;
diff --git a/gobblefile.js b/gobblefile.js
index 4042dd7..b4870ca 100644
--- a/gobblefile.js
+++ b/gobblefile.js
@@ -8,30 +8,27 @@ var node = src
 		entry: 'rollup.js',
 		dest: 'rollup.js',
 		format: 'cjs',
-		external: [ 'sander', 'acorn' ],
+		external: [ 'fs' ],
 		sourceMap: true
 	})
 	.transform( 'babel' );
 
 var browserPlaceholders = {
-	sander: fs.readFileSync( 'browser/sander.js' ).toString()
+	fs: fs.readFileSync( 'browser/fs.js' ).toString(),
+	promise: fs.readFileSync( 'browser/promise.js' ).toString()
 };
 
 var browser = src
 	.transform( 'rollup-babel', {
 		entry: 'rollup.js',
 		dest: 'rollup.browser.js',
-		format: 'cjs',
+		format: 'umd',
+		moduleName: 'rollup',
 		load: function ( id ) {
-			if ( ~id.indexOf( 'sander.js' ) ) return browserPlaceholders.sander;
+			if ( ~id.indexOf( 'fs.js' ) ) return browserPlaceholders.fs;
+			if ( ~id.indexOf( 'es6-promise' ) ) return browserPlaceholders.promise;
 			return fs.readFileSync( id ).toString();
-		},
-		external: [ 'acorn' ]
-	})
-	.transform( 'browserify', {
-		entries: [ './rollup.browser' ],
-		dest: 'rollup.browser.js',
-		standalone: 'rollup'
+		}
 	});
 
 module.exports = gobble([ node, browser ]);
diff --git a/package.json b/package.json
index 64a2ac8..b9f46c3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rollup",
-  "version": "0.18.0",
+  "version": "0.18.1",
   "description": "Next-generation ES6 module bundler",
   "main": "dist/rollup.js",
   "jsnext:main": "src/rollup.js",
@@ -39,32 +39,30 @@
   },
   "homepage": "https://github.com/rollup/rollup",
   "devDependencies": {
-    "babel": "^5.8.21",
+    "acorn": "^2.3.0",
     "babel-core": "^5.5.8",
+    "chalk": "^1.0.0",
     "codecov.io": "^0.1.6",
     "console-group": "^0.1.2",
+    "es6-promise": "^3.0.2",
     "eslint": "^1.1.0",
+    "estree-walker": "^0.1.3",
     "gobble": "^0.10.1",
     "gobble-babel": "^5.5.8",
-    "gobble-browserify": "^0.6.1",
     "gobble-cli": "^0.4.2",
-    "gobble-esperanto-bundle": "^0.2.0",
-    "gobble-rollup": "^0.8.0",
-    "gobble-rollup-babel": "^0.1.0",
+    "gobble-rollup": "^0.10.0",
+    "gobble-rollup-babel": "^0.4.0",
     "istanbul": "^0.3.20",
+    "magic-string": "^0.7.0",
     "mocha": "^2.2.4",
     "remap-istanbul": "^0.2.0",
-    "source-map": "^0.4.4"
-  },
-  "dependencies": {
-    "acorn": "^2.3.0",
-    "chalk": "^1.0.0",
-    "estree-walker": "^0.1.3",
-    "magic-string": "^0.7.0",
-    "minimist": "^1.1.1",
     "sander": "^0.3.3",
+    "source-map": "^0.4.4",
     "source-map-support": "^0.3.1"
   },
+  "dependencies": {
+    "minimist": "^1.1.1"
+  },
   "files": [
     "src",
     "dist",
diff --git a/src/Bundle.js b/src/Bundle.js
index 65a381b..5a4b522 100644
--- a/src/Bundle.js
+++ b/src/Bundle.js
@@ -1,4 +1,4 @@
-import { Promise } from 'sander';
+import Promise from 'es6-promise/lib/es6-promise/promise';
 import MagicString from 'magic-string';
 import { blank, keys } from './utils/object';
 import Module from './Module';
diff --git a/src/Module.js b/src/Module.js
index 646d1ee..911d604 100644
--- a/src/Module.js
+++ b/src/Module.js
@@ -1,4 +1,4 @@
-import { parse } from 'acorn';
+import { parse } from 'acorn/src/index';
 import MagicString from 'magic-string';
 import { walk } from 'estree-walker';
 import Statement from './Statement';
diff --git a/src/rollup.js b/src/rollup.js
index 94722e7..9fd126e 100644
--- a/src/rollup.js
+++ b/src/rollup.js
@@ -1,5 +1,5 @@
 import { basename } from './utils/path';
-import { writeFile } from 'sander';
+import { writeFile } from './utils/fs';
 import { keys } from './utils/object';
 import SOURCEMAPPING_URL from './utils/sourceMappingURL';
 import Bundle from './Bundle';
diff --git a/src/utils/fs.js b/src/utils/fs.js
new file mode 100644
index 0000000..fc3ee77
--- /dev/null
+++ b/src/utils/fs.js
@@ -0,0 +1,30 @@
+import Promise from 'es6-promise/lib/es6-promise/promise';
+import * as fs from 'fs';
+import { dirname } from './path';
+
+function mkdirpath ( path ) {
+	const dir = dirname( path );
+	try {
+		fs.readdirSync( dir );
+	} catch ( err ) {
+		mkdirpath( dir );
+		fs.mkdirSync( dir );
+	}
+}
+
+export function writeFile ( dest, data ) {
+	return new Promise( ( fulfil, reject ) => {
+		mkdirpath( dest );
+
+		fs.writeFile( dest, data, err => {
+			if ( err ) {
+				reject( err );
+			} else {
+				fulfil();
+			}
+		});
+	});
+}
+
+export const readdirSync = fs.readdirSync;
+export const readFileSync = fs.readFileSync;
diff --git a/src/utils/load.js b/src/utils/load.js
index 60b7566..6cd87bc 100644
--- a/src/utils/load.js
+++ b/src/utils/load.js
@@ -1,8 +1,8 @@
-import { readFileSync } from 'sander';
+import { readFileSync } from './fs';
 
 export function defaultLoader ( id, options ) {
 	// TODO support plugins e.g. !css and !json?
-	const source = readFileSync( id, { encoding: 'utf-8' });
+	const source = readFileSync( id, 'utf-8' );
 
 	return options.transform.reduce( ( source, transformer ) => {
 		return transformer( source, id );
diff --git a/src/utils/resolveId.js b/src/utils/resolveId.js
index 7cbed09..2ce7ad0 100644
--- a/src/utils/resolveId.js
+++ b/src/utils/resolveId.js
@@ -1,5 +1,5 @@
 import { absolutePath, dirname, isAbsolute, resolve } from './path';
-import { readdirSync, readFileSync } from 'sander';
+import { readdirSync, readFileSync } from './fs';
 
 function dirExists ( dir ) {
 	try {
@@ -58,7 +58,7 @@ export function defaultExternalResolver ( id, importer ) {
 			let pkg;
 
 			try {
-				pkg = JSON.parse( readFileSync( pkgPath ).toString() );
+				pkg = JSON.parse( readFileSync( pkgPath, 'utf-8' ) );
 			} catch ( err ) {
 				throw new Error( `Missing or malformed package.json: ${modulePath}` );
 			}