I copied package.json from another project and now want to bump all of the dependencies to their latest versions since this is a fresh project and I don't mind fixing something if it breaks.

What's the easiest way to do this?

The best way I know is to run npm info express version then update each dependency in package.json manually. There must be a better way.

{
  "name": "myproject",
  "description": "my node project",
  "version": "1.0.0",
  "engines": {
    "node": "0.8.4",
    "npm": "1.1.65"
  },
  "private": true,
  "dependencies": {
    "express": "~3.0.3", // how do I get these bumped to latest?
    "mongodb": "~1.2.5",
    "underscore": "~1.4.2",
    "rjs": "~2.9.0",
    "jade": "~0.27.2",
    "async": "~0.1.22"
  }
}

For Yarn specific solutions refer to this StackOverflow thread.