Grunt update required

[shobhit-deque]

npm ERR! Found: grunt@1.4.1
npm ERR! node_modules/grunt
npm ERR! dev grunt@"^1.0.4" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer grunt@"~0.4.5" from grunt-concat-json@0.0.10
npm ERR! node_modules/grunt-concat-json
npm ERR! dev grunt-concat-json@"SpringRoll/grunt-concat-json" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!