Обновление проекта Symfony с 3,2 до 3,4

Question

Я пытаюсь обновить Symfony на компьютере с Windows 10.Текущая версия 3.2.Я обновил пакет composer.json до "symfony/symfony": "3.4.*".Затем я запустил composer update symfony/symfony и получил следующее сообщение об ошибке:

The requested package symfony/symfony 3.4.* exists as symfony/symfony[v3.2.2] but these are rejected by your constraint.

Есть идеи, в чем может быть проблема?Спасибо!

Вот файл composer.json:

{
    "name": "martin/editor",
    "license": "proprietary",
    "type": "project",
    "autoload": {
        "psr-4": {
            "": "src/"
        },
        "classmap": [
            "app/AppKernel.php",
            "app/AppCache.php"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "require": {
        "php": ">=5.5.9",
        "symfony/symfony": "3.4.*",
        "doctrine/orm": "^2.5",
        "doctrine/doctrine-bundle": "^1.6",
        "doctrine/doctrine-cache-bundle": "^1.2",
        "symfony/swiftmailer-bundle": "^2.3.10",
        "symfony/monolog-bundle": "^3.0.2",
        "symfony/polyfill-apcu": "^1.0",
        "sensio/distribution-bundle": "^5.0",
        "sensio/framework-extra-bundle": "^3.0.2",
        "incenteev/composer-parameter-handler": "^2.0",
        "mikehaertl/php-shellcommand": ">=1.2.4",
        "phpoffice/phpspreadsheet": "*"
    },
    "require-dev": {
        "sensio/generator-bundle": "^3.0",
        "symfony/phpunit-bridge": "^3.0"
    },
    "scripts": {
        "symfony-scripts": [
            "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
        ],
        "post-install-cmd": [
            "@symfony-scripts"
        ],
        "post-update-cmd": [
            "@symfony-scripts"
        ]
    },
    "extra": {
        "symfony-app-dir": "app",
        "symfony-bin-dir": "bin",
        "symfony-var-dir": "var",
        "symfony-web-dir": "web",
        "symfony-tests-dir": "tests",
        "symfony-assets-install": "relative",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": null
    },
    "repositories": [{
        "type": "composer",
        "url": "https:\/\/www.phpclasses.org\/"
    }, {
        "packagist": false
    }, {
        "type": "vcs",
        "url": "https://github.com/mikehaertl/php-shellcommand"
    }, {
        "type": "vcs",
        "url": "https://github.com/PHPOffice/PhpSpreadsheet"
    }, {
        "type": "vcs",
        "url": "https://github.com/php-fig/simple-cache"
    }
    ]
}