composer如何只更新一个，而不是全部？

require

composer update g9901/yii2-gftp

g9901/yii2-gftp

# /home/flxx/basic/composer.json

{

    "name": "yiisoft/yii2-app-basic",

    "description": "Yii 2 Basic Application Template",

    "keywords": ["yii2", "framework", "basic", "application template"],

    "homepage": "http://www.yiiframework.com/",

    "type": "project",

    "license": "BSD-3-Clause",

    "support": {

        "issues": "https://github.com/yiisoft/yii2/issues?state=open",

        "forum": "http://www.yiiframework.com/forum/",

        "wiki": "http://www.yiiframework.com/wiki/",

        "irc": "irc://irc.freenode.net/yii",

        "source": "https://github.com/yiisoft/yii2"

    },

    "minimum-stability": "stable",

    "require": {

        "php": ">=5.4.0",

        "yiisoft/yii2": "*",

        "yiisoft/yii2-bootstrap": "*",

        "yiisoft/yii2-swiftmailer": "*",

        "2amigos/yii2-ckeditor-widget": "*",

        "yiisoft/yii2-jui": "*",

        "2amigos/yii2-date-time-picker-widget": "~1.0",

        "g9901/yii2-gftp": "*"

    },

    "require-dev": {

        "yiisoft/yii2-codeception": "*",

        "yiisoft/yii2-debug": "*",

        "yiisoft/yii2-gii": "*",

        "yiisoft/yii2-faker": "*"

    },

    "config": {

        "process-timeout": 1800

    },

    "scripts": {

        "post-create-project-cmd": [

            "yii\\composer\\Installer::postCreateProject"

        ]

    },

    "extra": {

        "yii\\composer\\Installer::postCreateProject": {

            "setPermission": [

                {

                    "runtime": "0777",

                    "web/assets": "0777",

                    "yii": "0755"

                }

            ],

            "generateCOOKIEValidationKey": [

                "config/web.php"

            ]

        },

        "asset-installer-paths": {

            "npm-asset-library": "vendor/npm",

            "bower-asset-library": "vendor/bower"

        }

    }

}