Angular 2的最新版本是什麼？如何更新它？

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我用了幾個命令，以更新的角度2，如Angular 2的最新版本是什麼？如何更新它？

npm update --save

在的package.json角2的版本是2.0.0^- beta.21，這是最新的版本？如果沒有，那麼我怎樣才能將其更新到最新版本

這裏是我的package.json文件

{ 
    "name": "angular2-quickstart", 
    "version": "1.0.0", 
    "scripts": { 
    "start": "concurrent \"npm run tsc:w\" \"npm run lite\" ", 
    "tsc": "tsc", 
    "tsc:w": "tsc -w", 
    "lite": "lite-server", 
    "typings": "typings", 
    "postinstall": "typings install" 
    }, 
    "license": "ISC", 
    "dependencies": { 
    "angular2": "^2.0.0-beta.21", 
    "es6-promise": "^4.1.0", 
    "es6-shim": "^0.35.3", 
    "reflect-metadata": "^0.1.10", 
    "rxjs": "^5.3.1", 
    "systemjs": "^0.20.12", 
    "zone.js": "^0.8.10" 
    }, 
    "devDependencies": { 
    "@angular/cli": "^1.0.2", 
    "concurrently": "^3.4.0", 
    "lite-server": "^2.1.0", 
    "typescript": "^2.3.2" 
    } 
}

來源

2017-05-08 Usama Iftikhar