composer require google/apiclient:^2.0.0@RC

./composer.json has been updated
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
    - google/apiclient v2.0.0-RC3 requires guzzlehttp/guzzle 5.2.* -> satisfiable by guzzlehttp/guzzle[5.2.0] but these conflict with your requirements or minimum-stability.
    - google/apiclient v2.0.0-RC2 requires guzzlehttp/guzzle 5.2.* -> satisfiable by guzzlehttp/guzzle[5.2.0] but these conflict with your requirements or minimum-stability.
    - google/apiclient v2.0.0-RC1 requires guzzlehttp/guzzle 5.2.* -> satisfiable by guzzlehttp/guzzle[5.2.0] but these conflict with your requirements or minimum-stability.
    - google/apiclient v2.0.0-RC8 requires google/auth 0.8 -> satisfiable by google/auth[v0.8].
    - Conclusion: don't install google/auth v0.8
    - Installation request for guzzlehttp/psr7 (locked at 1.3.0) -> satisfiable by guzzlehttp/psr7[1.3.0].
    - google/apiclient v2.0.0-RC6 requires google/auth 0.7 -> satisfiable by google/auth[v0.7].
    - google/apiclient v2.0.0-RC7 requires google/auth 0.7 -> satisfiable by google/auth[v0.7].
    - Conclusion: don't install google/auth v0.7
    - google/apiclient v2.0.0-RC4 requires google/auth 0.5 -> satisfiable by google/auth[v0.5].
    - google/apiclient v2.0.0-RC5 requires google/auth 0.5 -> satisfiable by google/auth[v0.5].
    - Conclusion: don't install google/auth v0.5
    - Installation request for google/apiclient ^2.0.0@RC -> satisfiable by google/apiclient[v2.0.0-RC1, v2.0.0-RC2, v2.0.0-RC3, v2.0.0-RC4, v2.0.0-RC5, v2.0.0-RC6, v2.0.0-RC7, v2.0.0-RC8].


Installation failed, reverting ./composer.json to its original content.