Update symfony 4

Bonjour à tous,

Je cherche à upgrader mon SF 4.2 en SF 4.4
Voici le contenu de composer.json :

{
  "name": "mySoft/mySoft",
  "license": "proprietary",
  "type": "project",
  "require": {
    "php": "^7.1.3",
    "ext-json": "*",
    "beberlei/doctrineextensions": "^1.0",
    "craue/formflow-bundle": "~3.0@dev",
    "doctrine/doctrine-bundle": "^1.6",
    "doctrine/doctrine-cache-bundle": "^1.2",
    "doctrine/doctrine-migrations-bundle": "^1.1",
    "doctrine/orm": "^2.6",
    "dywee/core-bundle": "dev-master",
    "endroid/qr-code": "2.*",
    "ensepar/html2pdf-bundle": "dev-master",
    "friendsofsymfony/ckeditor-bundle": "^2.1",
    "friendsofsymfony/jsrouting-bundle": "^2.3",
    "friendsofsymfony/user-bundle": "^2.0",
    "gedmo/doctrine-extensions": "^2.4",
    "incenteev/composer-parameter-handler": "~2.0@dev",
    "knplabs/doctrine-behaviors": "~1.1",
    "knplabs/knp-time-bundle": "^1.7",
    "krustnic/docx-merge": "^1.0",
    "liip/imagine-bundle": "dev-master",
    "misd/phone-number-bundle": "~1.0",
    "myclabs/deep-copy": "^1.8",
    "oro/doctrine-extensions": "dev-master",
    "phpoffice/phpspreadsheet": "^1.2",
    "phpoffice/phpword": "dev-develop",
    "piwik/device-detector": "dev-master",
    "sensio/framework-extra-bundle": "^5.3",
    "sentry/sentry-symfony": "^3.0",
    "stof/doctrine-extensions-bundle": "^1.3",
    "symfony/asset": "^4.0",
    "symfony/console": "^4.0",
    "symfony/debug-pack": "^1.0",
    "symfony/dotenv": "^4.0",
    "symfony/expression-language": "^4.0",
    "symfony/filesystem": "^4.0",
    "symfony/flex": "^1.0",
    "symfony/form": "^4.0",
    "symfony/framework-bundle": "^4.0",
    "symfony/monolog-bundle": "^3.4",
    "symfony/orm-pack": "^1.0",
    "symfony/security-bundle": "^4.0",
    "symfony/swiftmailer-bundle": "^3.2",
    "symfony/translation": "^4.0",
    "symfony/twig-bundle": "^4.0",
    "symfony/validator": "^4.0",
    "symfony/webpack-encore-bundle": "^1.6",
    "symfony/yaml": "^4.0",
    "tetranz/select2entity-bundle": "^2.9",
    "vich/uploader-bundle": "^1.8",
    "whiteoctober/tcpdf-bundle": "^1.0"
  },
  "require-dev": {
    "doctrine/doctrine-fixtures-bundle": "^2.3",
    "phpstan/phpstan": "^0.10.5",
    "phpstan/phpstan-doctrine": "^0.10.0",
    "phpstan/phpstan-symfony": "^0.10.2",
    "symfony/debug-bundle": "*",
    "symfony/maker-bundle": "^1.11",
    "symfony/phpunit-bridge": "^4.0",
    "symfony/web-server-bundle": "^4.0"
  },
  "config": {
    "platform": {
      "php": "7.1.3"
    },
    "preferred-install": {
      "*": "dist"
    },
    "sort-packages": true
  },
  "autoload": {
    "psr-4": {
      "App\\": "src/"
    }
  },
  "autoload-dev": {
    "psr-4": {
      "App\\Tests\\": "tests/"
    }
  },
  "scripts": {
    "auto-scripts": {
      "cache:clear": "symfony-cmd",
      "ckeditor:install --clear=drop": "symfony-cmd",
      "assets:install --symlink --relative %PUBLIC_DIR%": "symfony-cmd",
      "assets:install %PUBLIC_DIR%": "symfony-cmd"
    },
    "post-install-cmd": [
      "@auto-scripts"
    ],
    "post-update-cmd": [
      "@auto-scripts"
    ]
  },
  "conflict": {
    "symfony/symfony": "*"
  },
  "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": "config/parameters.yml"
    },
    "symfony": {
      "allow-contrib": true
    }
  }
}

Quelqu'un peut-il m'aider ?

Merci beaucoup...