composer package not working

$ ./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 chrisboulton/php-diff could not be found in any version, there may be a typo in the package name.

https://packagist.org/packages/chrisboulton/php-diff

https://packagist.org/search/?q=php-diff -> https://packagist.org/packages/phpspec/php-diff

It seems that this repository is inactive.

[tomoyuki28jp]

+1

[kaeverens]

+1 as well