yarn upgrade all

upgrade.js

// upgrade all dependencies
// requires `spawncommand`

// node upgrade.js

const spawncommand = require('spawncommand')
const { devDependencies, dependencies } = require('./package.json');

(async () => {
	const keys = Object.keys({ ...devDependencies, ...dependencies })
		.map(s => `${s}@latest`)

	const proc = spawncommand('yarn', ['upgrade', ...keys])
	console.log(proc.spawnCommand)

	proc.stdout.pipe(process.stdout)
	proc.stderr.pipe(process.stderr)

	const { stdout, stderr, code } = await proc.promise
})()