Try the new and improved Authentication flow yourself

composer.json

{
  "name": "silverstripe/installer",
  "description": "The SilverStripe Framework Installer",
  "require": {
    "php": ">=5.6",
    "silverstripe/cms": "dev-authenticator-refactor as 4.0.x-dev",
    "silverstripe/framework": "dev-authenticator-refactor as 4.0.x-dev",
    "silverstripe/reports": "dev-authenticator_refactor as 4.0.x-dev",
    "silverstripe/siteconfig": "dev-authenticator_refactor as 4.0.x-dev",
    "silverstripe/versioned": "dev-authenticator_refactor as 1@dev",
    "silverstripe/asset-admin": "dev-authenticator_refactor as 1.x@dev",
    "silverstripe/admin": "dev-authenticator_refactor as 1.0@dev",
    "silverstripe/assets": "dev-authentication_refactor as 1.0.x-dev",
    "golonka/bbcodeparser": "^2.2",
    "firesphere/yubiauth": "dev-ss4",
    "firesphere/silverstripe-geshiparser": "dev-master",
    "yubico/u2flib-server": "^1.0",
    "silverleague/ideannotator": "3.x-dev",
    "roave/security-advisories": "dev-master"
  },
  "require-dev": {
    "codeception/codeception": "^2.0",
    "friendsofphp/php-cs-fixer": "^2.1",
    "phpunit/PHPUnit": "^5.5",
    "scriptfusion/phpunit-immediate-exception-printer": "^1",
    "silverstripe/graphql-devtools": "dev-master",
    "silverstripe/behat-extension": "dev-master"
  },
  "extra": {
    "branch-alias": {
      "dev-master": "4.0.x-dev"
    }
  },
  "config": {
    "process-timeout": 600
  },
  "repositories": [
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-framework.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-cms.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-recaptcha.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-reports.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-siteconfig.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-admin.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-assets.git"
    },
    {
      "type": "vcs",
      "url": "[email protected]:Firesphere/silverstripe-asset-admin.git"
    }
  ],
  "prefer-stable": true,
  "minimum-stability": "dev"
}

@Firesphere don't forget versioned. :)