TypeError: pipe.then is not a function

[thisconnect]

Installation worked fine on
OS X 10.11.5
Xcode Version 7.3.1
Node v6.2.0

npm i imagemin-webp

> cwebp-bin@3.1.0 postinstall /Users/me/project/node_modules/cwebp-bin
> node lib/install.js

  ✔ cwebp pre-build test passed successfully

testing

const imagemin = require('imagemin');
const imageminWebp = require('imagemin-webp');

imagemin(['images/*.{jpg,png}'], 'build', {
  use: [imageminWebp({quality: 50})]
})
.then(() => {
  console.log('Images optimized');
})
.catch(err => {
  console.log(err)
});

errors:

node ./imagemin-webp.js 
TypeError: pipe.then is not a function
    at fsP.readFile.then.data (/Users/me/project/node_modules/imagemin/index.js:15:4)

[kevva]

Fixed in f0994b5. Hadn't published a new version. Install 4.x.x.

[thisconnect]

@kevva thanks a lot!