php composer.phar update don't work

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Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install symfony/symfony 2.1.x-dev
    - Conclusion: don't install symfony/symfony v2.1.1
    - Conclusion: don't install symfony/symfony v2.1.0
    - Conclusion: don't install symfony/symfony v2.1.0-RC2
    - Conclusion: don't install symfony/symfony v2.1.0-RC1
    - Conclusion: don't install symfony/symfony v2.1.0-BETA4
    - Conclusion: don't install symfony/symfony v2.1.0-BETA3
    - Conclusion: don't install symfony/symfony v2.1.0-BETA2
    - sensio/distribution-bundle dev-master requires symfony/framework-bundle 2.2.* -> satisfiable by symfony/symfony 2.2.x-dev, symfony/framework-bundle 2.2.x-dev, symfony/symfony 2.2.x-dev.
    - sensio/distribution-bundle dev-master requires symfony/framework-bundle 2.2.* -> satisfiable by symfony/symfony 2.2.x-dev, symfony/framework-bundle 2.2.x-dev, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-BETA1, symfony/symfony 2.2.x-dev.
    - don't install symfony/symfony v2.1.0-BETA1|don't install symfony/framework-bundle 2.2.x-dev
    - Can only install one of: symfony/symfony v2.1.0-BETA1, symfony/symfony 2.2.x-dev.
    - Installation request for symfony/symfony 2.1.* -> satisfiable by symfony/symfony v2.1.0-RC1, symfony/symfony v2.1.0-RC2, symfony/symfony v2.1.0-BETA2, symfony/symfony v2.1.0-BETA3, symfony/symfony v2.1.0-BETA4, symfony/symfony 2.1.x-dev, symfony/symfony v2.1.0, symfony/symfony v2.1.1, symfony/symfony v2.1.0-BETA1.
    - Installation request for sensio/distribution-bundle dev-master -> satisfiable by sensio/distribution-bundle dev-master.