I'm getting this error while doing composer install

composer.json

{
    "require": {
        "guzzle/guzzle": "~3.1",
        "stripe/stripe-php": "1.*",
        "swiftmailer/swiftmailer": ">=4.2.0,<4.3-dev",
        "ppi/framework": "2.0"
    },
    "extra": {
	"branch-alias": {
            "dev-master": "2.0-dev"
        }
    },
    "minimum-stability": "dev"
}

gistfile1.txt

$ sudo php composer.phar update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - The requested package ppi/framework could not be found in any version, there may be a typo in the package name.

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.