machine:
  node:
    version: 4.4.7
test:
  override:
    - grunt coverage
deployment:
  release:
    tag: /^[0-9]+(\.[0-9]+)*/
    commands:
      - grunt shipit:prd deploy
general:
  artifacts:
    - "test/coverage"

machine:
  node:
    version: 4
test:
  override:
    - grunt coverage
deployment:
  release:
    tag: /^[0-9]+(\.[0-9]+)*/
    commands:
      - grunt shipit:prd deploy
general:
  artifacts:
    - "test/coverage"

Use latest node 4 version
Use latest node 4 version

- always use the latest version of node 4