Try to update Sonata, have error with jms-serializer - symfony

Question

I need to update my bundles for security reasons but when i try to do a composer update, i have a lot of problem with sonata.
First, SonataCore, sonataMedia and JMS-serializer disappear.
bundles.php
If a tried to reinstall SonataCore with composer require sonata-project/core-bundle
i have this error: Problem 1 - Root composer.json requires sonata-project/core-bundle ^3.20 -> satisfiable by sonata-project/core-bundle[3.20.0]. - sonata-project/core-bundle 3.20.0 requires sonata-project/form-extensions ^0.1 -> found sonata-project/form-extensions[0.1.0, 0.1.1, 0.1.2] but the package is fixed to 1.16.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
If a tried to reinstall SonataMedia with composer require sonata-project/media-bundle,
i have this error: Problem 1 - sonata-project/media-bundle[4.1.0, ..., 4.1.5] require doctrine/persistence ^2.0 -> found doctrine/persistence[2.0.0, ..., 2.5.3] but the package is fixed to 1.3.8 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. - Root composer.json requires sonata-project/media-bundle ^4.1 -> satisfiable by sonata-project/media-bundle[4.1.0, ..., 4.1.5].
I can install JMS-Serializer but then, i have an error with jms_serializer.handler_registry even though i use it nowhere in my code (but it appears in the cache).
My composer.json :
"type": "project",
"license": "proprietary",
"require": {
"php": "^7.1.3",
"ext-ctype": "*",
"ext-iconv": "*",
"ext-json": "*",
"composer/package-versions-deprecated": "1.11.99.5",
"dekalee/mailjet-bundle": "^2.1",
"doctrine/common": "^2",
"doctrine/doctrine-bundle": "^2",
"doctrine/doctrine-migrations-bundle": "^2",
"doctrine/orm": "^2",
"friendsofsymfony/rest-bundle": "^2.6",
"friendsofsymfony/user-bundle": "~2.0",
"guzzlehttp/guzzle": "^6.5",
"hslavich/oneloginsaml-bundle": "^1.4",
"jmose/command-scheduler-bundle": "^2.2",
"jms/serializer-bundle": "^4.0",
"michaeldegroot/doctrine-encrypt-bundle": "^4.0",
"nelmio/api-doc-bundle": "^3.5",
"paragonie/halite": "^4",
"phpoffice/phpspreadsheet": "^1.10",
"sonata-project/admin-bundle": "^3.56",
"sonata-project/doctrine-orm-admin-bundle": "^3.12",
"sonata-project/formatter-bundle": "^4.1",
"sonata-project/intl-bundle": "^2.7",
"sonata-project/user-bundle": "^4.5",
"symfony/console": "4.4.*",
"symfony/dotenv": "4.4.*",
"symfony/flex": "^1.3.1",
"symfony/framework-bundle": "4.4.*",
"symfony/mailer": "4.4.*",
"symfony/mime": "4.4.*",
"symfony/monolog-bundle": "^3.5",
"symfony/serializer": "4.4.*",
"symfony/swiftmailer-bundle": "^3.4",
"symfony/translation": "4.4.*",
"symfony/twig-bundle": "4.4.*",
"symfony/yaml": "4.4.*",
"twig/extra-bundle": "^2.12|^3.0",
"twig/twig": "^2.12|^3.0",
"vich/uploader-bundle": "^1.12"
},
"require-dev": {
"sonata-project/easy-extends-bundle": "^2.5",
"symfony/debug-bundle": "4.4.*",
"symfony/maker-bundle": "^1.14",
"symfony/stopwatch": "4.4.*",
"symfony/web-profiler-bundle": "4.4.*"
},
"config": {
"preferred-install": {
"*": "dist"
},
"sort-packages": true,
"allow-plugins": {
"ocramius/package-versions": true,
"symfony/flex": true
}
},
"autoload": {
"psr-4": {
"App\\": "src/"
}
},
"autoload-dev": {
"psr-4": {
"App\\Tests\\": "tests/"
}
},
"replace": {
"paragonie/random_compat": "2.*",
"symfony/polyfill-ctype": "*",
"symfony/polyfill-iconv": "*",
"symfony/polyfill-php71": "*",
"symfony/polyfill-php70": "*",
"symfony/polyfill-php56": "*"
},
"scripts": {
"auto-scripts": {
"cache:clear": "symfony-cmd",
"assets:install %PUBLIC_DIR%": "symfony-cmd"
},
"post-install-cmd": [
"#auto-scripts"
],
"post-update-cmd": [
"#auto-scripts"
]
},
"conflict": {
"symfony/symfony": "*"
},
"extra": {
"symfony": {
"allow-contrib": "true",
"require": "4.4.*"
}
}
}
I'm a novice in project management so i have no idea how to resolve all of this, i hope you can help me.