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 and then update each dependency in package.json manually. There must be a better way.

{
  "name": "myproject",
  "description": "my node project",
  "version": "1.0.0",
  "dependencies": {
    "express": "^3.0.3", // how do I get these bumped to latest?
    "mongodb": "^1.2.5",
    "underscore": "^1.4.2"
  }
}

For Yarn-specific solutions, refer to this Stack Overflow question.