EntityFramework.SqlServer 7.0.0-rc1-final ？

 Hi,

I update all to rc1.final ,and want these dependencies:

"dependencies": {"Microsoft.AspNet.Mvc": "6.0.0-rc1-final","Microsoft.AspNet.Cors": "6.0.0-rc1-final","Microsoft.AspNet.Server.WebListener": "1.0.0-rc1-final","EntityFramework.Commands": "7.0.0-rc1-final","EntityFramework.Core": "7.0.0-rc1-final","EntityFramework.SqlServer": "7.0.0-rc1-final","Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final","Microsoft.Extensions.PlatformAbstractions": "1.0.0-rc1-final","Microsoft.Net.Http": "2.2.29","Newtonsoft.Json": "7.0.1"
  }

But dnu restore said :  " Unable to locate Dependency EntityFramework.SqlServer >= 7.0.0-rc1-final" , Why?

Thanks!