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curl error 60 while downloading https://packagist.laravel-china.org/packages.json: Peer‘s Certifica.

composer update时报错[ComposerDownloaderTransportException]   curl error 60 while downloading https://packagist.phpcomposer.com/packages.json: Peer's Certificate has expired. 将composer.json文件中的packagist地址修改了；"repositories": {        "packagist": {            "type": "composer",            "url": "https://packagist.phpcompo...