diff --git a/.github/workflows/bare_run.yaml b/.github/workflows/bare_run.yaml
deleted file mode 100644
index 078e13b..0000000
--- a/.github/workflows/bare_run.yaml
+++ /dev/null
@@ -1,23 +0,0 @@
-name: Bare Run on various PHP versions
-
-on:
-    push:
-        tags:
-            - '*'
-
-jobs:
-    bare_run:
-        runs-on: ubuntu-latest
-
-        strategy:
-            fail-fast: false
-            matrix:
-                php_version: ['7.4', '8.0', '8.2']
-
-        steps:
-            -   uses: shivammathur/setup-php@v2
-                with:
-                    php-version: ${{ matrix.php }}
-                    coverage: none
-
-            -   run: composer require rector/jack --dev
diff --git a/.github/workflows/downgraded_release.yaml b/.github/workflows/downgraded_release.yaml
deleted file mode 100644
index d70f2fa..0000000
--- a/.github/workflows/downgraded_release.yaml
+++ /dev/null
@@ -1,96 +0,0 @@
-name: Downgraded Release
-
-on:
-    push:
-        branches:
-            - main
-        tags:
-            - '*'
-
-jobs:
-    downgrade_release:
-        runs-on: ubuntu-latest
-
-        steps:
-            -   uses: "actions/checkout@v5"
-                with:
-                    token: ${{ secrets.WORKFLOWS_TOKEN || github.token }}
-
-            -
-                uses: "shivammathur/setup-php@v2"
-                with:
-                    php-version: 8.4
-                    coverage: none
-
-            # invoke patches
-            -   run: composer install --ansi
-
-            # but no dev packages
-            -   run: composer update --no-dev --ansi
-
-            # get rector to "rector-local" directory, to avoid downgrading itself in the /vendor
-            -   run: mkdir rector-local
-            -   run: composer require rector/rector --working-dir rector-local --ansi
-
-            # downgrade to PHP 7.2
-            -   run: rector-local/vendor/bin/rector process bin src vendor --config build/rector-downgrade-php.php --ansi
-
-            # clear the dev files
-            -   run: rm -rf tests ecs.php phpstan.neon phpunit.xml .gitignore .editorconfig composer.lock composer-dependency-analyser.php
-
-            # prefix and scope
-            -   run: sh prefix-code.sh
-
-            # remove the original .github, to fully override it with the target repository one below
-            -   run: rm -rf .github
-
-            # copy PHP 7.2 composer + workflows
-            -   run: cp -r build/target-repository/. .
-
-            # clear the build files
-            -   run: rm -rf build prefix-code.sh full-tool-build.sh scoper.php rector.php php-scoper.phar rector-local
-
-            # clone the remote repository, so we can commit on top of its history and push without --force
-            # inspired by https://github.com/easy-coding-standard/ecs-src/blob/main/.github/workflows/buid_release.yaml
-            -
-                uses: "actions/checkout@v5"
-                with:
-                    repository: anywherephp/jack
-                    path: remote-repository
-                    token: ${{ secrets.WORKFLOWS_TOKEN }}
-
-            # remove remote files, to avoid piling up dead code in remote repository
-            # the remote .gitignore must go too, as it ignores the /vendor that is shipped in this scoped build
-            -   run: rm -rf remote-repository/bin remote-repository/src remote-repository/vendor remote-repository/docs remote-repository/.github remote-repository/.gitignore
-
-            # copy the downgraded code to the remote repository
-            -   run: rsync -a --exclude .git --exclude remote-repository ./ remote-repository/
-
-            # setup git user
-            -
-                working-directory: remote-repository
-                run: |
-                    git config user.email "tomas@getrector.org"
-                    git config user.name "rector-bot"
-
-            # publish to remote repository without tag
-            -
-                name: "Push Downgraded Code - branch"
-                working-directory: remote-repository
-                if: "!startsWith(github.ref, 'refs/tags/')"
-                run: |
-                    git add --all
-                    git commit -m "Updated Jack to commit ${{ github.event.after }}"
-                    git push --quiet origin main
-
-            # publish to remote repository with tag
-            -
-                name: "Push Downgraded Code - tag"
-                working-directory: remote-repository
-                if: "startsWith(github.ref, 'refs/tags/')"
-                run: |
-                    git add --all
-                    git commit --allow-empty -m "Jack ${GITHUB_REF#refs/tags/}"
-                    git push --quiet origin main
-                    git tag "${GITHUB_REF#refs/tags/}" -m "${GITHUB_REF#refs/tags/}"
-                    git push --quiet origin "${GITHUB_REF#refs/tags/}"
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
new file mode 100644
index 0000000..fd4abed
--- /dev/null
+++ b/.github/workflows/tests.yaml
@@ -0,0 +1,61 @@
+name: Tests
+
+on:
+    pull_request: null
+    push:
+        branches:
+            - main
+
+jobs:
+    tests:
+        strategy:
+            fail-fast: false
+            matrix:
+                php-version: ['7.4', '8.2', '8.5']
+
+        name: PHP ${{ matrix.php-version }}
+        runs-on: ubuntu-latest
+
+        steps:
+            -   uses: actions/checkout@v5
+
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php-version }}
+                    coverage: none
+
+            # analysis tools require PHP 8.2+ and are irrelevant to the test run;
+            # drop them so the low-PHP jobs install a clean, 7.4-compatible dependency set
+            -   run: composer remove --dev --no-update tracy/tracy symplify/easy-coding-standard phpstan/phpstan phpstan/extension-installer symplify/phpstan-rules rector/rector rector/swiss-knife tomasvotruba/class-leak shipmonk/composer-dependency-analyser
+
+            -   run: composer update --no-progress --prefer-stable
+
+            -   name: Tests
+                run: vendor/bin/phpunit
+
+            -   name: Smoke run CLI app
+                run: bin/jack list
+
+    lint:
+        strategy:
+            fail-fast: false
+            matrix:
+                php-version: ['7.4', '8.5']
+
+        name: PHP Linter ${{ matrix.php-version }}
+        runs-on: ubuntu-latest
+
+        steps:
+            -   uses: actions/checkout@v5
+
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php-version }}
+                    coverage: none
+
+            # analysis tools require PHP 8.2+; drop them so the 7.4 job installs a clean dependency set
+            -   run: composer remove --dev --no-update tracy/tracy symplify/easy-coding-standard phpstan/phpstan phpstan/extension-installer symplify/phpstan-rules rector/rector rector/swiss-knife tomasvotruba/class-leak shipmonk/composer-dependency-analyser
+
+            -   run: composer update --no-progress --prefer-stable
+
+            -   run: vendor/bin/parallel-lint src bin tests
diff --git a/.gitignore b/.gitignore
index a708f80..5ae28f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,5 @@ composer.lock
 
 tmp
 /.idea/
+
+.phpunit.result.cache
diff --git a/build/build-scoped.sh b/build/build-scoped.sh
deleted file mode 100755
index 5276ec6..0000000
--- a/build/build-scoped.sh
+++ /dev/null
@@ -1,52 +0,0 @@
-#!/usr/bin/env bash
-
-# inspired from https://github.com/rectorphp/rector/blob/main/build/build-rector-scoped.sh
-
-# see https://stackoverflow.com/questions/66644233/how-to-propagate-colors-from-bash-script-to-github-action?noredirect=1#comment117811853_66644233
-export TERM=xterm-color
-
-# show errors
-set -e
-
-# script fails if trying to access to an undefined variable
-set -u
-
-
-# functions
-note()
-{
-    MESSAGE=$1;
-    printf "\n";
-    echo "\033[0;33m[NOTE] $MESSAGE\033[0m";
-}
-
-
-# configure here
-BUILD_DIRECTORY=$1
-RESULT_DIRECTORY=$2
-
-# ---------------------------
-
-note "Starts"
-
-# 2. scope it
-note "Running scoper with '$RESULT_DIRECTORY' output directory"
-wget https://github.com/humbug/php-scoper/releases/download/0.17.5/php-scoper.phar -N --no-verbose
-
-# create directory
-mkdir "$RESULT_DIRECTORY" -p
-
-# Work around possible PHP memory limits
-php -d memory_limit=-1 php-scoper.phar add-prefix bin src stubs vendor composer.json --output-dir "../$RESULT_DIRECTORY" --config scoper.php --force --ansi --working-dir "$BUILD_DIRECTORY"
-
-note "Show prefixed files in '$RESULT_DIRECTORY'"
-ls -l $RESULT_DIRECTORY
-
-note "Dumping Composer Autoload"
-composer dump-autoload --working-dir "$RESULT_DIRECTORY" --ansi --classmap-authoritative --no-dev
-
-# make bin/jack runnable without "php"
-chmod 777 "$RESULT_DIRECTORY/bin/jack"
-chmod 777 "$RESULT_DIRECTORY/bin/jack.php"
-
-note "Finished"
diff --git a/build/rector-downgrade-php.php b/build/rector-downgrade-php.php
deleted file mode 100644
index c768643..0000000
--- a/build/rector-downgrade-php.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-use Rector\Config\RectorConfig;
-
-return RectorConfig::configure()
-    ->withDowngradeSets(php72: true)
-    ->withSkip([
-        '*/Tests/*',
-        '*/tests/*',
-    ]);
diff --git a/build/target-repository/.github/workflows/auto_closer.yaml b/build/target-repository/.github/workflows/auto_closer.yaml
deleted file mode 100644
index cd5667c..0000000
--- a/build/target-repository/.github/workflows/auto_closer.yaml
+++ /dev/null
@@ -1,23 +0,0 @@
-name: Auto Closer PR
-
-on:
-  pull_request_target:
-    types: [opened]
-
-jobs:
-  run:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: superbrothers/close-pull-request@v3
-      with:
-        # Optional. Post a issue comment just before closing a pull request.
-        comment: |
-          Hi, thank you for your contribution.
-
-          Unfortunately, this repository is read-only. It's a build of the main repository.
-
-          We'd like to kindly ask you to move the contribution there - https://github.com/rectorphp/jack.
-
-          We'll check it, review it and give you feed back right way.
-
-          Thank you.
diff --git a/build/target-repository/.github/workflows/bare_run.yaml b/build/target-repository/.github/workflows/bare_run.yaml
deleted file mode 100644
index f2a277c..0000000
--- a/build/target-repository/.github/workflows/bare_run.yaml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: Bare Run
-
-on: [pull_request, push]
-
-jobs:
-    bare_run:
-        runs-on: ubuntu-latest
-
-        strategy:
-            fail-fast: false
-            matrix:
-                php_version: ['7.2', '7.3', '7.4', '8.0', '8.2']
-
-        steps:
-            -   uses: actions/checkout@v2
-
-            -
-                uses: shivammathur/setup-php@v2
-                with:
-                    php-version: ${{ matrix.php_version }}
-                    coverage: none
-
-            # no --ansi here, the entropy console does not support it
-            -   run: php bin/jack list
diff --git a/build/target-repository/README.md b/build/target-repository/README.md
deleted file mode 100644
index deacb2f..0000000
--- a/build/target-repository/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Jack - Anywhere version
-
-See original repository for more details: https://github.com/rectorphp/jack
diff --git a/build/target-repository/composer.json b/build/target-repository/composer.json
deleted file mode 100644
index 114efe5..0000000
--- a/build/target-repository/composer.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-    "name": "anywherephp/jack",
-    "description": "Swiss knife in pocket of every upgrade architect",
-    "license": "proprietary",
-    "require": {
-        "php": ">=7.2"
-    },
-    "bin": [
-        "bin/jack"
-    ],
-    "autoload": {
-        "psr-4": {
-            "Rector\\Jack\\": "src"
-        }
-    }
-}
diff --git a/composer-dependency-analyser.php b/composer-dependency-analyser.php
index d7fd23e..452a00c 100644
--- a/composer-dependency-analyser.php
+++ b/composer-dependency-analyser.php
@@ -3,5 +3,8 @@
 declare(strict_types=1);
 
 use ShipMonk\ComposerDependencyAnalyser\Config\Configuration;
+use ShipMonk\ComposerDependencyAnalyser\Config\ErrorType;
 
-return new Configuration();
+// polyfill provides global functions, so no direct symbol usage is detected
+return (new Configuration())
+    ->ignoreErrorsOnPackage('symfony/polyfill-php80', [ErrorType::UNUSED_DEPENDENCY]);
diff --git a/composer.json b/composer.json
index bdec6a1..c0d6f19 100644
--- a/composer.json
+++ b/composer.json
@@ -6,16 +6,18 @@
         "bin/jack"
     ],
     "require": {
-        "php": ">=8.4",
+        "php": ">=7.4",
         "composer/semver": "^3.5",
         "entropy/entropy": "^0.4.17",
-        "symfony/process": "^8.1"
+        "symfony/polyfill-php80": "^1.31",
+        "symfony/process": "^5.4 || ^6.4 || ^7.0 || ^8.1"
     },
     "require-dev": {
         "symplify/easy-coding-standard": "^13.3",
+        "php-parallel-lint/php-parallel-lint": "^1.4",
         "phpstan/extension-installer": "^1.4",
         "phpstan/phpstan": "^2.2",
-        "phpunit/phpunit": "^13.3",
+        "phpunit/phpunit": "^9.6",
         "rector/rector": "^2.6",
         "rector/swiss-knife": "^2.6",
         "shipmonk/composer-dependency-analyser": "^1.8",
diff --git a/full-tool-build.sh b/full-tool-build.sh
deleted file mode 100644
index 94f3710..0000000
--- a/full-tool-build.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/usr/bin/env bash
-
-# add patches
-composer install --ansi
-
-# but skip dev dependencies
-composer update --no-dev --ansi
-
-# remove tests and useless files, to make downgraded, scoped and deployed codebase as small as possible
-rm -rf tests
-
-# downgrade with rector
-mkdir rector-local
-composer require rector/rector --working-dir rector-local
-rector-local/vendor/bin/rector process bin src vendor --config build/rector-downgrade-php-72.php --ansi
-
-# prefix
-sh prefix-code.sh
diff --git a/phpunit.xml b/phpunit.xml
index e89aa98..9d1c4cb 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -4,7 +4,6 @@
     xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
     bootstrap="vendor/autoload.php"
     colors="true"
-    cacheDirectory=".phpunit.cache"
 >
     <testsuites>
         <testsuite name="unit">
diff --git a/prefix-code.sh b/prefix-code.sh
deleted file mode 100644
index de7b0c8..0000000
--- a/prefix-code.sh
+++ /dev/null
@@ -1,47 +0,0 @@
-#!/usr/bin/env bash
-
-# inspired from https://github.com/rectorphp/rector/blob/main/build/build-rector-scoped.sh
-
-# see https://stackoverflow.com/questions/66644233/how-to-propagate-colors-from-bash-script-to-github-action?noredirect=1#comment117811853_66644233
-export TERM=xterm-color
-
-# show errors
-set -e
-
-# script fails if trying to access to an undefined variable
-set -u
-
-
-# functions
-note()
-{
-    MESSAGE=$1;
-    printf "\n";
-    echo "\033[0;33m[NOTE] $MESSAGE\033[0m";
-}
-
-# ---------------------------
-
-# 2. scope it
-note "Downloading php-scoper 0.18.11"
-wget https://github.com/humbug/php-scoper/releases/download/0.18.11/php-scoper.phar -N --no-verbose
-
-
-note "Running php-scoper"
-
-# Work around possible PHP memory limits
-php -d memory_limit=-1 php-scoper.phar add-prefix bin src vendor composer.json --config scoper.php --force --ansi --output-dir scoped-code
-
-# the output code is in "/scoped-code", lets move it up
-# the local directories have to be empty to move easily
-rm -r bin src vendor composer.json
-mv scoped-code/* .
-
-note "Dumping Composer Autoload"
-composer dump-autoload --ansi --classmap-authoritative --no-dev
-
-# make bin/ecs runnable without "php"
-chmod 777 "bin/jack"
-chmod 777 "bin/jack.php"
-
-note "Finished"
diff --git a/rector.php b/rector.php
index e3b919f..2127aba 100644
--- a/rector.php
+++ b/rector.php
@@ -6,7 +6,7 @@
 
 return RectorConfig::configure()
     ->withPaths([__DIR__ . '/src', __DIR__ . '/tests'])
-    ->withPhpSets()
+    ->withPhpSets(php74: true)
     ->withPreparedSets(
         codeQuality: true,
         deadCode: true,
@@ -17,6 +17,5 @@
         instanceOf: true,
         naming: true
     )
-    ->withSkip([\Rector\Php83\Rector\ClassMethod\AddOverrideAttributeToOverriddenMethodsRector::class])
     ->withImportNames(removeUnusedImports: true)
-    ->withSkip(['*/scoper.php', '*/Source/*', '*/Fixture/*']);
+    ->withSkip(['*/Source/*', '*/Fixture/*']);
diff --git a/scoper.php b/scoper.php
deleted file mode 100644
index 41a0643..0000000
--- a/scoper.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-require __DIR__ . '/vendor/autoload.php';
-
-$nowDateTime = new DateTime('now');
-$timestamp = $nowDateTime->format('Ym');
-
-// @see https://github.com/humbug/php-scoper/blob/master/docs/further-reading.md
-
-// see https://github.com/humbug/php-scoper
-return [
-    'prefix' => 'Jack' . $timestamp,
-    'expose-constants' => ['#^SYMFONY\_[\p{L}_]+$#'],
-    'exclude-namespaces' => ['#^Rector\\\\Jack#', '#^Webmozart\\\\#', '#^Symfony\\\\Polyfill#', '#^PHPUnit\\\\'],
-    'exclude-files' => [
-        // do not prefix "trigger_deprecation" from symfony - https://github.com/symfony/symfony/commit/0032b2a2893d3be592d4312b7b098fb9d71aca03
-        // these paths are relative to this file location, so it should be in the root directory
-        'vendor/symfony/deprecation-contracts/function.php',
-    ],
-];
diff --git a/src/Command/BreakPointCommand.php b/src/Command/BreakPointCommand.php
index f7fd942..2648fbd 100644
--- a/src/Command/BreakPointCommand.php
+++ b/src/Command/BreakPointCommand.php
@@ -13,13 +13,23 @@
 use Rector\Jack\Enum\ComposerKey;
 use Rector\Jack\OutdatedComposerFactory;
 
-final readonly class BreakPointCommand implements CommandInterface
+final class BreakPointCommand implements CommandInterface
 {
+    private OutdatedComposerFactory $outdatedComposerFactory;
+
+    private ComposerOutdatedResponseProvider $composerOutdatedResponseProvider;
+
+    private OutputPrinter $outputPrinter;
+
     public function __construct(
-        private OutdatedComposerFactory $outdatedComposerFactory,
-        private ComposerOutdatedResponseProvider $composerOutdatedResponseProvider,
-        private OutputPrinter $outputPrinter,
-    ) {}
+        OutdatedComposerFactory $outdatedComposerFactory,
+        ComposerOutdatedResponseProvider $composerOutdatedResponseProvider,
+        OutputPrinter $outputPrinter
+    ) {
+        $this->outdatedComposerFactory = $outdatedComposerFactory;
+        $this->composerOutdatedResponseProvider = $composerOutdatedResponseProvider;
+        $this->outputPrinter = $outputPrinter;
+    }
 
     /**
      * @param bool $dev Focus on dev packages only
@@ -56,7 +66,9 @@ static function (array $package) use ($ignore, $minDays, $now): bool {
                         return true;
                     }
 
-                    $pageAgeInDays = new DateTimeImmutable($package['latest-release-date'])->diff($now)->days;
+                    $latestReleaseDate = new DateTimeImmutable($package['latest-release-date']);
+                    $pageAgeInDays = $latestReleaseDate->diff($now)
+                        ->days;
                     return $pageAgeInDays >= $minDays;
                 }
             ),
diff --git a/src/Command/ListCommand.php b/src/Command/ListCommand.php
index 9bf2c29..fbda0c2 100644
--- a/src/Command/ListCommand.php
+++ b/src/Command/ListCommand.php
@@ -9,11 +9,14 @@
 use Entropy\Console\Output\HelpPrinter;
 use Entropy\Container\Container;
 
-final readonly class ListCommand implements CommandInterface
+final class ListCommand implements CommandInterface
 {
-    public function __construct(
-        private Container $container,
-    ) {}
+    private Container $container;
+
+    public function __construct(Container $container)
+    {
+        $this->container = $container;
+    }
 
     public function run(): int
     {
diff --git a/src/Command/OpenVersionsCommand.php b/src/Command/OpenVersionsCommand.php
index d78f5c1..767e8b4 100644
--- a/src/Command/OpenVersionsCommand.php
+++ b/src/Command/OpenVersionsCommand.php
@@ -14,14 +14,27 @@
 use Rector\Jack\Enum\ComposerKey;
 use Rector\Jack\OutdatedComposerFactory;
 
-final readonly class OpenVersionsCommand implements CommandInterface
+final class OpenVersionsCommand implements CommandInterface
 {
+    private OutdatedComposerFactory $outdatedComposerFactory;
+
+    private ComposerOutdatedResponseProvider $composerOutdatedResponseProvider;
+
+    private OpenVersionsComposerProcessor $openVersionsComposerProcessor;
+
+    private OutputPrinter $outputPrinter;
+
     public function __construct(
-        private OutdatedComposerFactory $outdatedComposerFactory,
-        private ComposerOutdatedResponseProvider $composerOutdatedResponseProvider,
-        private OpenVersionsComposerProcessor $openVersionsComposerProcessor,
-        private OutputPrinter $outputPrinter,
-    ) {}
+        OutdatedComposerFactory $outdatedComposerFactory,
+        ComposerOutdatedResponseProvider $composerOutdatedResponseProvider,
+        OpenVersionsComposerProcessor $openVersionsComposerProcessor,
+        OutputPrinter $outputPrinter
+    ) {
+        $this->outdatedComposerFactory = $outdatedComposerFactory;
+        $this->composerOutdatedResponseProvider = $composerOutdatedResponseProvider;
+        $this->openVersionsComposerProcessor = $openVersionsComposerProcessor;
+        $this->outputPrinter = $outputPrinter;
+    }
 
     /**
      * @param int $limit How many packages to open-up
diff --git a/src/Command/RaiseToInstalledCommand.php b/src/Command/RaiseToInstalledCommand.php
index d3404f1..7ae70fa 100644
--- a/src/Command/RaiseToInstalledCommand.php
+++ b/src/Command/RaiseToInstalledCommand.php
@@ -11,12 +11,19 @@
 use Entropy\Validation\Assert;
 use Rector\Jack\ComposerProcessor\RaiseToInstalledComposerProcessor;
 
-final readonly class RaiseToInstalledCommand implements CommandInterface
+final class RaiseToInstalledCommand implements CommandInterface
 {
+    private RaiseToInstalledComposerProcessor $raiseToInstalledComposerProcessor;
+
+    private OutputPrinter $outputPrinter;
+
     public function __construct(
-        private RaiseToInstalledComposerProcessor $raiseToInstalledComposerProcessor,
-        private OutputPrinter $outputPrinter,
-    ) {}
+        RaiseToInstalledComposerProcessor $raiseToInstalledComposerProcessor,
+        OutputPrinter $outputPrinter
+    ) {
+        $this->raiseToInstalledComposerProcessor = $raiseToInstalledComposerProcessor;
+        $this->outputPrinter = $outputPrinter;
+    }
 
     /**
      * @return ExitCode::*
diff --git a/src/Composer/ComposerOutdatedResponseProvider.php b/src/Composer/ComposerOutdatedResponseProvider.php
index 26fbd72..470b490 100644
--- a/src/Composer/ComposerOutdatedResponseProvider.php
+++ b/src/Composer/ComposerOutdatedResponseProvider.php
@@ -26,7 +26,10 @@ public function provide(): string
 
         $composerOutdatedProcess = Process::fromShellCommandline(
             'composer outdated --direct --minor-only --format json --ignore-platform-req=php',
-            timeout: 120
+            null,
+            null,
+            null,
+            120
         );
 
         $composerOutdatedProcess->mustRun();
diff --git a/src/Composer/InstalledVersionResolver.php b/src/Composer/InstalledVersionResolver.php
index b07c9e1..7bf50b5 100644
--- a/src/Composer/InstalledVersionResolver.php
+++ b/src/Composer/InstalledVersionResolver.php
@@ -9,14 +9,19 @@
 
 final class InstalledVersionResolver
 {
+    private string $installedJsonFilePath;
+
+    public function __construct(string $installedJsonFilePath)
+    {
+        $this->installedJsonFilePath = $installedJsonFilePath;
+    }
+
     /**
      * @return array<string, string>
      */
     public function resolve(): array
     {
-        $installedJsonFilePath = getcwd() . '/vendor/composer/installed.json';
-
-        $installedJson = JsonFileLoader::loadFileToJson($installedJsonFilePath);
+        $installedJson = JsonFileLoader::loadFileToJson($this->installedJsonFilePath);
         if (! array_key_exists('packages', $installedJson)) {
             throw new ShouldNotHappenException('Missing "packages" key in "installed.json"');
         }
diff --git a/src/Composer/NextVersionResolver.php b/src/Composer/NextVersionResolver.php
index 65e54e6..0134f56 100644
--- a/src/Composer/NextVersionResolver.php
+++ b/src/Composer/NextVersionResolver.php
@@ -11,15 +11,18 @@
 /**
  * @see \Rector\Jack\Tests\Composer\NextVersionResolver\NextVersionResolverTest
  */
-final readonly class NextVersionResolver
+final class NextVersionResolver
 {
-    private const string MAJOR = 'major';
+    private const MAJOR = 'major';
 
-    private const string MINOR = 'minor';
+    private const MINOR = 'minor';
 
-    public function __construct(
-        private VersionParser $versionParser
-    ) {}
+    private VersionParser $versionParser;
+
+    public function __construct(VersionParser $versionParser)
+    {
+        $this->versionParser = $versionParser;
+    }
 
     public function resolve(string $packageName, string $composerVersion): string
     {
diff --git a/src/ComposerProcessor/OpenVersionsComposerProcessor.php b/src/ComposerProcessor/OpenVersionsComposerProcessor.php
index efa3056..9504661 100644
--- a/src/ComposerProcessor/OpenVersionsComposerProcessor.php
+++ b/src/ComposerProcessor/OpenVersionsComposerProcessor.php
@@ -13,11 +13,14 @@
 /**
  * @see \Rector\Jack\Tests\ComposerProcessor\OpenVersionsComposerProcessor\OpenVersionsComposerProcessorTest
  */
-final readonly class OpenVersionsComposerProcessor
+final class OpenVersionsComposerProcessor
 {
-    public function __construct(
-        private NextVersionResolver $nextVersionResolver
-    ) {}
+    private NextVersionResolver $nextVersionResolver;
+
+    public function __construct(NextVersionResolver $nextVersionResolver)
+    {
+        $this->nextVersionResolver = $nextVersionResolver;
+    }
 
     public function process(
         string $composerJsonContents,
diff --git a/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php b/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
index f2f3389..13fc475 100644
--- a/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
+++ b/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
@@ -16,12 +16,17 @@
 use Rector\Jack\ValueObject\ComposerProcessorResult\ChangedPackageVersionsResult;
 
 #[RelatedTest(RaiseToInstalledComposerProcessorTest::class)]
-final readonly class RaiseToInstalledComposerProcessor
+final class RaiseToInstalledComposerProcessor
 {
-    public function __construct(
-        private VersionParser $versionParser,
-        private InstalledVersionResolver $installedVersionResolver,
-    ) {}
+    private VersionParser $versionParser;
+
+    private InstalledVersionResolver $installedVersionResolver;
+
+    public function __construct(VersionParser $versionParser, InstalledVersionResolver $installedVersionResolver)
+    {
+        $this->versionParser = $versionParser;
+        $this->installedVersionResolver = $installedVersionResolver;
+    }
 
     public function process(string $composerJsonContents): ChangedPackageVersionsResult
     {
diff --git a/src/DependencyInjection/ContainerFactory.php b/src/DependencyInjection/ContainerFactory.php
index 9cdf23e..71a4d7d 100644
--- a/src/DependencyInjection/ContainerFactory.php
+++ b/src/DependencyInjection/ContainerFactory.php
@@ -6,6 +6,7 @@
 
 use Entropy\Container\Container;
 use Rector\Jack\Command\ListCommand;
+use Rector\Jack\Composer\InstalledVersionResolver;
 
 final class ContainerFactory
 {
@@ -19,6 +20,14 @@ public function create(): Container
             static fn(Container $container): ListCommand => new ListCommand($container)
         );
 
+        // resolve the installed.json from the current working directory of the analyzed project
+        $container->service(
+            InstalledVersionResolver::class,
+            static fn(): InstalledVersionResolver => new InstalledVersionResolver(
+                getcwd() . '/vendor/composer/installed.json'
+            )
+        );
+
         $container->autodiscover(__DIR__ . '/../../src');
 
         return $container;
diff --git a/src/Enum/ComposerKey.php b/src/Enum/ComposerKey.php
index 5dac319..88f435a 100644
--- a/src/Enum/ComposerKey.php
+++ b/src/Enum/ComposerKey.php
@@ -6,5 +6,5 @@
 
 final class ComposerKey
 {
-    public const string INSTALLED_KEY = 'installed';
+    public const INSTALLED_KEY = 'installed';
 }
diff --git a/src/OutdatedComposerFactory.php b/src/OutdatedComposerFactory.php
index 56613d7..a5955a5 100644
--- a/src/OutdatedComposerFactory.php
+++ b/src/OutdatedComposerFactory.php
@@ -12,11 +12,14 @@
 /**
  * @see \Rector\Jack\Tests\OutdatedComposerFactory\OutdatedComposerFactoryTest
  */
-final readonly class OutdatedComposerFactory
+final class OutdatedComposerFactory
 {
-    public function __construct(
-        private OutdatedPackageMapper $outdatedPackageMapper
-    ) {}
+    private OutdatedPackageMapper $outdatedPackageMapper;
+
+    public function __construct(OutdatedPackageMapper $outdatedPackageMapper)
+    {
+        $this->outdatedPackageMapper = $outdatedPackageMapper;
+    }
 
     /**
      * @param mixed[] $installedPackages
diff --git a/src/ValueObject/ChangedPackageVersion.php b/src/ValueObject/ChangedPackageVersion.php
index f8d7cb4..ad879af 100644
--- a/src/ValueObject/ChangedPackageVersion.php
+++ b/src/ValueObject/ChangedPackageVersion.php
@@ -4,13 +4,20 @@
 
 namespace Rector\Jack\ValueObject;
 
-final readonly class ChangedPackageVersion
+final class ChangedPackageVersion
 {
-    public function __construct(
-        private string $packageName,
-        private string $oldVersion,
-        private string $newVersion,
-    ) {}
+    private string $packageName;
+
+    private string $oldVersion;
+
+    private string $newVersion;
+
+    public function __construct(string $packageName, string $oldVersion, string $newVersion)
+    {
+        $this->packageName = $packageName;
+        $this->oldVersion = $oldVersion;
+        $this->newVersion = $newVersion;
+    }
 
     public function getPackageName(): string
     {
diff --git a/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php b/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php
index 4f46f6f..9879bb3 100644
--- a/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php
+++ b/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php
@@ -7,16 +7,24 @@
 use Entropy\Validation\Assert;
 use Rector\Jack\ValueObject\ChangedPackageVersion;
 
-final readonly class ChangedPackageVersionsResult
+final class ChangedPackageVersionsResult
 {
+    private string $composerJsonContents;
+
+    /**
+     * @var ChangedPackageVersion[]
+     */
+    private array $changedPackageVersions;
+
     /**
      * @param ChangedPackageVersion[] $changedPackageVersions
      */
-    public function __construct(
-        private string $composerJsonContents,
-        private array $changedPackageVersions,
-    ) {
+    public function __construct(string $composerJsonContents, array $changedPackageVersions)
+    {
         Assert::allIsInstanceOf($changedPackageVersions, ChangedPackageVersion::class);
+
+        $this->composerJsonContents = $composerJsonContents;
+        $this->changedPackageVersions = $changedPackageVersions;
     }
 
     public function getComposerJsonContents(): string
diff --git a/src/ValueObject/OutdatedComposer.php b/src/ValueObject/OutdatedComposer.php
index 0307bca..d7b934c 100644
--- a/src/ValueObject/OutdatedComposer.php
+++ b/src/ValueObject/OutdatedComposer.php
@@ -6,15 +6,21 @@
 
 use Entropy\Validation\Assert;
 
-final readonly class OutdatedComposer
+final class OutdatedComposer
 {
+    /**
+     * @var OutdatedPackage[]
+     */
+    private array $outdatedPackages;
+
     /**
      * @param OutdatedPackage[] $outdatedPackages
      */
-    public function __construct(
-        private array $outdatedPackages
-    ) {
+    public function __construct(array $outdatedPackages)
+    {
         Assert::allIsInstanceOf($outdatedPackages, OutdatedPackage::class);
+
+        $this->outdatedPackages = $outdatedPackages;
     }
 
     public function getProdPackagesCount(): int
diff --git a/src/ValueObject/OutdatedPackage.php b/src/ValueObject/OutdatedPackage.php
index 150eb9c..5d9d9fe 100644
--- a/src/ValueObject/OutdatedPackage.php
+++ b/src/ValueObject/OutdatedPackage.php
@@ -6,17 +6,36 @@
 
 use Entropy\Utils\Regex;
 
-final readonly class OutdatedPackage
+final class OutdatedPackage
 {
+    private string $name;
+
+    private string $currentVersion;
+
+    private string $composerVersion;
+
+    private bool $isProd;
+
+    private string $latestVersion;
+
+    // nullable on composer 2.7-
+    private ?string $currentVersionAge;
+
     public function __construct(
-        private string $name,
-        private string $currentVersion,
-        private string $composerVersion,
-        private bool $isProd,
-        private string $latestVersion,
-        // nullable on composer 2.7-
-        private ?string $currentVersionAge,
-    ) {}
+        string $name,
+        string $currentVersion,
+        string $composerVersion,
+        bool $isProd,
+        string $latestVersion,
+        ?string $currentVersionAge
+    ) {
+        $this->name = $name;
+        $this->currentVersion = $currentVersion;
+        $this->composerVersion = $composerVersion;
+        $this->isProd = $isProd;
+        $this->latestVersion = $latestVersion;
+        $this->currentVersionAge = $currentVersionAge;
+    }
 
     public function getName(): string
     {
diff --git a/tests/Composer/NextVersionResolver/NextVersionResolverTest.php b/tests/Composer/NextVersionResolver/NextVersionResolverTest.php
index df3e968..362ebea 100644
--- a/tests/Composer/NextVersionResolver/NextVersionResolverTest.php
+++ b/tests/Composer/NextVersionResolver/NextVersionResolverTest.php
@@ -4,7 +4,6 @@
 
 namespace Rector\Jack\Tests\Composer\NextVersionResolver;
 
-use PHPUnit\Framework\Attributes\DataProvider;
 use Rector\Jack\Composer\NextVersionResolver;
 use Rector\Jack\Tests\AbstractTestCase;
 
@@ -19,7 +18,9 @@ protected function setUp(): void
         $this->nextVersionResolver = $this->make(NextVersionResolver::class);
     }
 
-    #[DataProvider('provideData')]
+    /**
+     * @dataProvider provideData
+     */
     public function test(string $packageName, string $composerVersion, string $expectedVersion): void
     {
         $nextVersion = $this->nextVersionResolver->resolve($packageName, $composerVersion);
diff --git a/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/Fixture/installed.json b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/Fixture/installed.json
new file mode 100644
index 0000000..844b3e4
--- /dev/null
+++ b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/Fixture/installed.json
@@ -0,0 +1,8 @@
+{
+    "packages": [
+        {
+            "name": "nette/utils",
+            "version": "v4.1.0"
+        }
+    ]
+}
diff --git a/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php
index 8b1b3bc..ff14414 100644
--- a/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php
+++ b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php
@@ -4,8 +4,9 @@
 
 namespace Rector\Jack\Tests\ComposerProcessor\RaiseToInstalledComposerProcessor;
 
+use Composer\Semver\VersionParser;
 use Entropy\Utils\FileSystem;
-use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Jack\Composer\InstalledVersionResolver;
 use Rector\Jack\ComposerProcessor\RaiseToInstalledComposerProcessor;
 use Rector\Jack\Tests\AbstractTestCase;
 use Rector\Jack\ValueObject\ChangedPackageVersion;
@@ -18,7 +19,12 @@ protected function setUp(): void
     {
         parent::setUp();
 
-        $this->raiseToInstalledComposerProcessor = $this->make(RaiseToInstalledComposerProcessor::class);
+        // hermetic installed versions, so the test does not depend on the real vendor/ state
+        $installedVersionResolver = new InstalledVersionResolver(__DIR__ . '/Fixture/installed.json');
+        $this->raiseToInstalledComposerProcessor = new RaiseToInstalledComposerProcessor(
+            new VersionParser(),
+            $installedVersionResolver
+        );
     }
 
     public function test(): void
@@ -87,7 +93,9 @@ public static function provideSkipSuggestChangeFiles(): iterable
         ];
     }
 
-    #[DataProvider('provideSkipSuggestChangeFiles')]
+    /**
+     * @dataProvider provideSkipSuggestChangeFiles
+     */
     public function testSkipSuggestChange(string $file, string $changedFileContent): void
     {
         $composerJsonContents = FileSystem::read($file);