Fehler bei der Quellenaktualisierung des Composer China

composer update

> php artisan clear-compiled
> php artisan optimize
Generating optimized class loader
> php artisan ide-helper:generate
A new helper file was written to _ide_helper.php
Loading composer repositories with package information

                                                                                                                                      
  [Composer\Downloader\TransportException]                                                                                            
  The "https://packagist.phpcomposer.com/packages.json" file could not be downloaded: Peer certificate CN=`*.b0.upaiyun.com' did not  
   match expected CN=`packagist.phpcomposer.com'                                                                                      
  Failed to enable crypto                                                                                                             
  failed to open stream: operation failed

c:\upupw\htdocs\laravel>composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Removing illuminate/support (v5.2.37)
  - Removing illuminate/contracts (v5.2.37)
  - Removing illuminate/console (v5.2.37)
  - Removing illuminate/cache (v5.2.37)
  - Removing illuminate/http (v5.2.37)
  - Removing illuminate/session (v5.2.37)
  - Removing illuminate/config (v5.2.37)
  - Removing illuminate/filesystem (v5.2.37)
  - Removing illuminate/translation (v5.2.37)
  - Removing illuminate/pipeline (v5.2.37)
  - Removing illuminate/container (v5.2.37)
  - Removing illuminate/routing (v5.2.37)
  - Removing illuminate/events (v5.2.37)
  - Removing illuminate/database (v5.2.37)
Writing lock file
Generating autoload files
> Illuminate\Foundation\ComposerScripts::postUpdate
> php artisan optimize
Generating optimized class loader