Composer更新错误包装json

Question

我在Windows 7上。我在作曲家更新时收到此错误。

  [Composer\Downloader\TransportException]
  The "http://packagist.org/p/provider-2015-07%24eec61011fe6ec03b5dc7d406c70116caac2c28b7cb520e5a11a900b4afe8af7b.j
  son" file could not be downloaded: failed to open stream: HTTP request failed!

作曲家自我更新

 You are already using composer version edf14dab1561096c10c71c7dfd81597ff94995a7.

每次都有相同的错误。