composer require doctrine/dbalが動きません

Laravelでテーブルの編集をしようと思ったのですが、どうやらcomposer require doctrine/dbalというコマンドを打たないとカラムの削除やら属性の変更ができないみたいなのですがうまくいきません。

下記のようなエラーメッセージが出ます。

unix
1The "https://packagist.org/packages.json" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages:
2error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
3Failed to enable crypto
4failed to open stream: operation failed
5https://packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date
6
7                                                                               
8  [Composer\Downloader\TransportException]                                     
9  The "http://packagist.org/p/doctrine/dbal%240a0685fc3137749c574e41c8c30d690  
10  47798bea9ad9339895d366743aa7c1696.json" file could not be downloaded (HTTP/  
11  1.1 404 Not Found)                                                           
12                                                                               
13
14require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...