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プロジェクトで ZF2 を更新しようとすると、次の警告が表示されます。

# php composer.phar update
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing zendframework/zendframework (2.1.5)
    Loading from cache

    Skipped installation of bin/classmap_generator.php for package zendframework/zendframework: name conflicts with an existing file
zendframework/zendframework suggests installing doctrine/common (Doctrine\Common >=2.1 for annotation features)
zendframework/zendframework suggests installing ext-intl (ext/intl for i18n features)
zendframework/zendframework suggests installing ircmaxell/random-lib (Fallback random byte generator for Zend\Math\Rand if OpenSSL/Mcrypt extensions are unavailable)
zendframework/zendframework suggests installing pecl-weakref (Implementation of weak references for Zend\Stdlib\CallbackHandler)
zendframework/zendframework suggests installing zendframework/zendpdf (ZendPdf for creating PDF representations of barcodes)
zendframework/zendframework suggests installing zendframework/zendservice-recaptcha (ZendService\ReCaptcha for rendering ReCaptchas in Zend\Captcha and/or Zend\Form)
Writing lock file
Generating autoload files

ここで何がうまくいかないのですか?これらの対立の原因は何ですか?ZF2を正しくアップデートする方法は?

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