如何使用Bower安装最新的不稳定AngularJS组件？

yo angular –minsafe

当我运行“bower list”命令时,我得到以下内容：

angular#1.0.8 (latest is 1.2.0-rc.2)
angular-mocks#1.0.8 (latest is 1.2.0-rc.2)
 -angular#1.0.8 (latest is 1.2.0-rc.2)
angular-scenario#1.0.8 (latest is 1.2.0-rc.2)
 -angular#1.0.8 (latest is 1.2.0-rc.2)
angular-scenario#1.0.8 (latest is 1.2.0-rc.2)
 -angular#1.0.8 (latest is 1.2.0-rc.2)
es5-shim#2.0.12(latest is 2.1.0)
json3#3.2.5

我想安装最新的不稳定版本的角度和它的依赖.

我的凉鞋版本是1.2.6.

我试图做的是更换bower.json中的组件版本：

{
 "name": "testapp","version": "0.0.0","dependencies": {
   "angular": "1.2.0.-rc.2","json3": "~3.2.4","es5-shim": "~2.0.8"
 },"devDependencies": {
    "angular-mocks": "1.2.0.-rc.2","angular-scenario": "1.2.0.-rc.2"
  }
}

并运行以下命令：

bower update angular –force-latest

这给了我以下错误：

bower ENORESTARGET Tag/branch 1.2.0.-rc.2 does not exist

此外,我已经尝试删除bower_components文件夹,使用“bower cache clean”清理缓存,然后“bower install”.
但是我得到了相同的ENORESTARGET错误.

我究竟做错了什么？