diff --git a/src/Command/DumpEnvCommand.php b/src/Command/DumpEnvCommand.php
index 6f7ed6f1f..b36cc08ab 100644
--- a/src/Command/DumpEnvCommand.php
+++ b/src/Command/DumpEnvCommand.php
@@ -22,14 +22,10 @@
 
 class DumpEnvCommand extends BaseCommand
 {
-    private $config;
-    private $options;
-
-    public function __construct(Config $config, Options $options)
-    {
-        $this->config = $config;
-        $this->options = $options;
-
+    public function __construct(
+        private Config $config,
+        private Options $options,
+    ) {
         parent::__construct();
     }
 
diff --git a/src/Command/InstallRecipesCommand.php b/src/Command/InstallRecipesCommand.php
index d1ae1a4b1..017ec0050 100644
--- a/src/Command/InstallRecipesCommand.php
+++ b/src/Command/InstallRecipesCommand.php
@@ -24,17 +24,15 @@
 
 class InstallRecipesCommand extends BaseCommand
 {
-    /** @var Flex */
-    private $flex;
-    private $rootDir;
-    private $dotenvPath;
-
-    public function __construct(/* cannot be type-hinted */ $flex, string $rootDir, string $dotenvPath = '.env')
+    /** 
+     * @param Flex $flex
+     */
+    public function __construct(
+        /* cannot be type-hinted */ private $flex,
+        private string $rootDir,
+        private string $dotenvPath = '.env'
+    )
     {
-        $this->flex = $flex;
-        $this->rootDir = $rootDir;
-        $this->dotenvPath = $dotenvPath;
-
         parent::__construct();
     }
 
diff --git a/src/Command/RecipesCommand.php b/src/Command/RecipesCommand.php
index 3cdac81c7..5943607ad 100644
--- a/src/Command/RecipesCommand.php
+++ b/src/Command/RecipesCommand.php
@@ -29,16 +29,17 @@
  */
 class RecipesCommand extends BaseCommand
 {
-    /** @var \Symfony\Flex\Flex */
-    private $flex;
-
-    private Lock $symfonyLock;
     private GithubApi $githubApi;
 
-    public function __construct(/* cannot be type-hinted */ $flex, Lock $symfonyLock, HttpDownloader $downloader)
+    /** 
+     * @param \Symfony\Flex\Flex $flex 
+     */
+    public function __construct(
+        /* cannot be type-hinted */ private $flex,
+        private Lock $symfonyLock,
+        HttpDownloader $downloader
+    )
     {
-        $this->flex = $flex;
-        $this->symfonyLock = $symfonyLock;
         $this->githubApi = new GithubApi($downloader);
 
         parent::__construct();
diff --git a/src/Command/UpdateRecipesCommand.php b/src/Command/UpdateRecipesCommand.php
index c75507eca..40c874637 100644
--- a/src/Command/UpdateRecipesCommand.php
+++ b/src/Command/UpdateRecipesCommand.php
@@ -32,20 +32,20 @@
 
 class UpdateRecipesCommand extends BaseCommand
 {
-    /** @var Flex */
-    private $flex;
-    private $downloader;
-    private $configurator;
-    private $rootDir;
     private $githubApi;
     private $processExecutor;
 
-    public function __construct(/* cannot be type-hinted */ $flex, Downloader $downloader, $httpDownloader, Configurator $configurator, string $rootDir)
+    /** 
+     * @param Flex $flex 
+     */
+    public function __construct(
+        /* cannot be type-hinted */ private $flex,
+        private Downloader $downloader,
+        $httpDownloader,
+        private Configurator $configurator,
+        private string $rootDir
+    )
     {
-        $this->flex = $flex;
-        $this->downloader = $downloader;
-        $this->configurator = $configurator;
-        $this->rootDir = $rootDir;
         $this->githubApi = new GithubApi($httpDownloader);
 
         parent::__construct();
diff --git a/src/Configurator.php b/src/Configurator.php
index 56976823b..3d0d1db58 100644
--- a/src/Configurator.php
+++ b/src/Configurator.php
@@ -21,18 +21,15 @@
  */
 class Configurator
 {
-    private $composer;
-    private $io;
-    private $options;
     private $configurators;
     private $postInstallConfigurators;
     private $cache;
 
-    public function __construct(Composer $composer, IOInterface $io, Options $options)
-    {
-        $this->composer = $composer;
-        $this->io = $io;
-        $this->options = $options;
+    public function __construct(
+        private Composer $composer,
+        private IOInterface $io,
+        private Options $options,
+    ) {
         // ordered list of configurators
         $this->configurators = [
             'bundles' => Configurator\BundlesConfigurator::class,
diff --git a/src/Configurator/AbstractConfigurator.php b/src/Configurator/AbstractConfigurator.php
index aea4dda94..fbfcedfa7 100644
--- a/src/Configurator/AbstractConfigurator.php
+++ b/src/Configurator/AbstractConfigurator.php
@@ -24,16 +24,13 @@
  */
 abstract class AbstractConfigurator
 {
-    protected $composer;
-    protected $io;
-    protected $options;
     protected $path;
 
-    public function __construct(Composer $composer, IOInterface $io, Options $options)
-    {
-        $this->composer = $composer;
-        $this->io = $io;
-        $this->options = $options;
+    public function __construct(
+        protected Composer $composer,
+        protected IOInterface $io,
+        protected Options $options,
+    ) {
         $this->path = new Path($options->get('root-dir'));
     }
 
diff --git a/src/Downloader.php b/src/Downloader.php
index 2adf00df8..21a980f2c 100644
--- a/src/Downloader.php
+++ b/src/Downloader.php
@@ -37,11 +37,9 @@ class Downloader
     private static $versions;
     private static $aliases;
 
-    private $io;
     private $sess;
     private $cache;
 
-    private HttpDownloader $rfs;
     private $degradedMode = false;
     private $endpoints;
     private $index;
@@ -49,10 +47,12 @@ class Downloader
     private $legacyEndpoint;
     private $caFile;
     private $enabled = true;
-    private $composer;
 
-    public function __construct(Composer $composer, IoInterface $io, HttpDownloader $rfs)
-    {
+    public function __construct(
+        private Composer $composer,
+        private IoInterface $io,
+        private HttpDownloader $rfs,
+    ) {
         if (getenv('SYMFONY_CAFILE')) {
             $this->caFile = getenv('SYMFONY_CAFILE');
         }
@@ -87,12 +87,10 @@ public function __construct(Composer $composer, IoInterface $io, HttpDownloader
             $this->endpoints = array_fill_keys($this->endpoints, []);
         }
 
-        $this->io = $io;
         $config = $composer->getConfig();
         $this->rfs = $rfs;
         $this->cache = new Cache($io, $config->get('cache-repo-dir').'/flex');
         $this->sess = bin2hex(random_bytes(16));
-        $this->composer = $composer;
     }
 
     public function getSessionId(): string
diff --git a/src/Event/UpdateEvent.php b/src/Event/UpdateEvent.php
index 06dbe0c5f..286a982bc 100644
--- a/src/Event/UpdateEvent.php
+++ b/src/Event/UpdateEvent.php
@@ -16,14 +16,11 @@
 
 class UpdateEvent extends Event
 {
-    private $force;
-    private $reset;
-
-    public function __construct(bool $force, bool $reset)
-    {
+    public function __construct(
+        private bool $force,
+        private bool $reset,
+    ) {
         $this->name = ScriptEvents::POST_UPDATE_CMD;
-        $this->force = $force;
-        $this->reset = $reset;
     }
 
     public function force(): bool
diff --git a/src/GithubApi.php b/src/GithubApi.php
index 391304cea..34b374be2 100644
--- a/src/GithubApi.php
+++ b/src/GithubApi.php
@@ -16,12 +16,9 @@
 
 class GithubApi
 {
-    /** @var HttpDownloader|RemoteFilesystem */
-    private $downloader;
-
-    public function __construct($downloader)
-    {
-        $this->downloader = $downloader;
+    public function __construct(
+        private HttpDownloader|RemoteFilesystem $downloader,
+    ) {
     }
 
     /**
diff --git a/src/InformationOperation.php b/src/InformationOperation.php
index 8cad6a863..64c6dbc71 100644
--- a/src/InformationOperation.php
+++ b/src/InformationOperation.php
@@ -10,13 +10,12 @@
  */
 class InformationOperation implements OperationInterface
 {
-    private $package;
     private $recipeRef = null;
     private $version = null;
 
-    public function __construct(PackageInterface $package)
-    {
-        $this->package = $package;
+    public function __construct(
+        private PackageInterface $package,
+    ) {
     }
 
     /**
diff --git a/src/Options.php b/src/Options.php
index f0872b510..3278fc44f 100644
--- a/src/Options.php
+++ b/src/Options.php
@@ -19,14 +19,12 @@
  */
 class Options
 {
-    private $options;
     private $writtenFiles = [];
-    private $io;
 
-    public function __construct(array $options = [], IOInterface $io = null)
-    {
-        $this->options = $options;
-        $this->io = $io;
+    public function __construct(
+        private array $options = [],
+        private ?IOInterface $io = null,
+    ) {
     }
 
     public function get(string $name)
diff --git a/src/PackageFilter.php b/src/PackageFilter.php
index 091bcd79b..5dfa6f762 100644
--- a/src/PackageFilter.php
+++ b/src/PackageFilter.php
@@ -26,13 +26,15 @@ class PackageFilter
 {
     private $versions;
     private $versionParser;
-    private $symfonyRequire;
     private $symfonyConstraints;
     private $downloader;
     private $io;
 
-    public function __construct(IOInterface $io, string $symfonyRequire, Downloader $downloader)
-    {
+    public function __construct(
+        IOInterface $io,
+        private string $symfonyRequire,
+        Downloader $downloader,
+    ) {
         $this->versionParser = new VersionParser();
         $this->symfonyRequire = $symfonyRequire;
         $this->symfonyConstraints = $this->versionParser->parseConstraints($symfonyRequire);
diff --git a/src/PackageJsonSynchronizer.php b/src/PackageJsonSynchronizer.php
index 698894c5b..f2589b67f 100644
--- a/src/PackageJsonSynchronizer.php
+++ b/src/PackageJsonSynchronizer.php
@@ -24,18 +24,14 @@
  */
 class PackageJsonSynchronizer
 {
-    private $rootDir;
-    private $vendorDir;
-    private $scriptExecutor;
-    private $io;
     private $versionParser;
 
-    public function __construct(string $rootDir, string $vendorDir, ScriptExecutor $scriptExecutor, IOInterface $io)
-    {
-        $this->rootDir = $rootDir;
-        $this->vendorDir = $vendorDir;
-        $this->scriptExecutor = $scriptExecutor;
-        $this->io = $io;
+    public function __construct(
+        private string $rootDir,
+        private string $vendorDir,
+        private ScriptExecutor $scriptExecutor,
+        private IOInterface $io
+    ) {
         $this->versionParser = new VersionParser();
     }
 
diff --git a/src/PackageResolver.php b/src/PackageResolver.php
index c7a7e5eb6..807b66f25 100644
--- a/src/PackageResolver.php
+++ b/src/PackageResolver.php
@@ -21,11 +21,10 @@
 class PackageResolver
 {
     private static $SYMFONY_VERSIONS = ['lts', 'previous', 'stable', 'next', 'dev'];
-    private $downloader;
 
-    public function __construct(Downloader $downloader)
-    {
-        $this->downloader = $downloader;
+    public function __construct(
+        private Downloader $downloader,
+    ) {
     }
 
     public function resolve(array $arguments = [], bool $isRequire = false): array
diff --git a/src/Path.php b/src/Path.php
index 8c7218b42..65da7e3da 100644
--- a/src/Path.php
+++ b/src/Path.php
@@ -16,11 +16,9 @@
  */
 class Path
 {
-    private $workingDirectory;
-
-    public function __construct($workingDirectory)
-    {
-        $this->workingDirectory = $workingDirectory;
+    public function __construct(
+        private $workingDirectory,
+    ) {
     }
 
     public function relativize(string $absolutePath): string
diff --git a/src/Recipe.php b/src/Recipe.php
index 3c8697245..4740a3482 100644
--- a/src/Recipe.php
+++ b/src/Recipe.php
@@ -18,19 +18,13 @@
  */
 class Recipe
 {
-    private $package;
-    private $name;
-    private $job;
-    private $data;
-    private $lock;
-
-    public function __construct(PackageInterface $package, string $name, string $job, array $data, array $lock = [])
-    {
-        $this->package = $package;
-        $this->name = $name;
-        $this->job = $job;
-        $this->data = $data;
-        $this->lock = $lock;
+    public function __construct(
+        private PackageInterface $package,
+        private string $name,
+        private string $job,
+        private array $data,
+        private array $lock = [],
+    ) {
     }
 
     public function getPackage(): PackageInterface
diff --git a/src/Response.php b/src/Response.php
index f334c0396..29899d6c9 100644
--- a/src/Response.php
+++ b/src/Response.php
@@ -16,20 +16,17 @@
  */
 class Response implements \JsonSerializable
 {
-    private $body;
-    private $origHeaders;
     private $headers;
-    private $code;
 
     /**
      * @param mixed $body The response as JSON
      */
-    public function __construct($body, array $headers = [], int $code = 200)
-    {
-        $this->body = $body;
-        $this->origHeaders = $headers;
-        $this->headers = $this->parseHeaders($headers);
-        $this->code = $code;
+    public function __construct(
+        private $body,
+        private array $origHeaders = [],
+        private int $code = 200,
+    ) {
+        $this->headers = $this->parseHeaders($origHeaders);
     }
 
     public function getStatusCode(): int
diff --git a/src/ScriptExecutor.php b/src/ScriptExecutor.php
index f895da304..b59274eb6 100644
--- a/src/ScriptExecutor.php
+++ b/src/ScriptExecutor.php
@@ -25,16 +25,14 @@
  */
 class ScriptExecutor
 {
-    private $composer;
-    private $io;
-    private $options;
     private $executor;
 
-    public function __construct(Composer $composer, IOInterface $io, Options $options, ProcessExecutor $executor = null)
-    {
-        $this->composer = $composer;
-        $this->io = $io;
-        $this->options = $options;
+    public function __construct(
+        private Composer $composer,
+        private IOInterface $io,
+        private Options $options,
+        ProcessExecutor $executor = null
+    ) {
         $this->executor = $executor ?: new ProcessExecutor();
     }
 
diff --git a/src/SymfonyBundle.php b/src/SymfonyBundle.php
index 7d1d8a1c3..ee7dd013f 100644
--- a/src/SymfonyBundle.php
+++ b/src/SymfonyBundle.php
@@ -19,12 +19,13 @@
  */
 class SymfonyBundle
 {
-    private $package;
-    private $operation;
     private $vendorDir;
 
-    public function __construct(Composer $composer, PackageInterface $package, string $operation)
-    {
+    public function __construct(
+        Composer $composer,
+        private PackageInterface $package,
+        private string $operation,
+    ) {
         $this->package = $package;
         $this->operation = $operation;
         $this->vendorDir = rtrim($composer->getConfig()->get('vendor-dir'), '/');
diff --git a/src/Unpack/Operation.php b/src/Unpack/Operation.php
index 1a6efd3fc..b73a58fcc 100644
--- a/src/Unpack/Operation.php
+++ b/src/Unpack/Operation.php
@@ -14,13 +14,11 @@
 class Operation
 {
     private $packages = [];
-    private $unpack;
-    private $sort;
 
-    public function __construct(bool $unpack, bool $sort)
-    {
-        $this->unpack = $unpack;
-        $this->sort = $sort;
+    public function __construct(
+        private bool $unpack,
+        private bool $sort,
+    ) {
     }
 
     public function addPackage(string $name, string $version, bool $dev)
diff --git a/src/Unpacker.php b/src/Unpacker.php
index e186e0323..45b771008 100644
--- a/src/Unpacker.php
+++ b/src/Unpacker.php
@@ -27,13 +27,13 @@
 
 class Unpacker
 {
-    private $composer;
-    private $resolver;
-    private $dryRun;
     private $versionParser;
 
-    public function __construct(Composer $composer, PackageResolver $resolver, bool $dryRun)
-    {
+    public function __construct(
+        private Composer $composer,
+        private PackageResolver $resolver,
+        private bool $dryRun
+    ) {
         $this->composer = $composer;
         $this->resolver = $resolver;
         $this->dryRun = $dryRun;
diff --git a/src/Update/RecipePatch.php b/src/Update/RecipePatch.php
index bb6abdbce..84db3b7c5 100644
--- a/src/Update/RecipePatch.php
+++ b/src/Update/RecipePatch.php
@@ -13,17 +13,12 @@
 
 class RecipePatch
 {
-    private $patch;
-    private $blobs;
-    private $deletedFiles;
-    private $removedPatches;
-
-    public function __construct(string $patch, array $blobs, array $deletedFiles, array $removedPatches = [])
-    {
-        $this->patch = $patch;
-        $this->blobs = $blobs;
-        $this->deletedFiles = $deletedFiles;
-        $this->removedPatches = $removedPatches;
+    public function __construct(
+        private string $patch,
+        private array $blobs,
+        private array $deletedFiles,
+        private array $removedPatches = [],
+    ) {
     }
 
     public function getPatch(): string
diff --git a/src/Update/RecipePatcher.php b/src/Update/RecipePatcher.php
index 1de2b34f6..15b7faa85 100644
--- a/src/Update/RecipePatcher.php
+++ b/src/Update/RecipePatcher.php
@@ -18,16 +18,14 @@
 
 class RecipePatcher
 {
-    private $rootDir;
     private $filesystem;
-    private $io;
     private $processExecutor;
 
-    public function __construct(string $rootDir, IOInterface $io)
-    {
-        $this->rootDir = $rootDir;
+    public function __construct(
+        private string $rootDir,
+        private IOInterface $io,
+    ) {
         $this->filesystem = new Filesystem();
-        $this->io = $io;
         $this->processExecutor = new ProcessExecutor($io);
     }
 
diff --git a/src/Update/RecipeUpdate.php b/src/Update/RecipeUpdate.php
index 994493831..7d14a111a 100644
--- a/src/Update/RecipeUpdate.php
+++ b/src/Update/RecipeUpdate.php
@@ -16,23 +16,18 @@
 
 class RecipeUpdate
 {
-    private $originalRecipe;
-    private $newRecipe;
-    private $lock;
-    private $rootDir;
-
     /** @var string[] */
     private $originalRecipeFiles = [];
     /** @var string[] */
     private $newRecipeFiles = [];
     private $copyFromPackagePaths = [];
 
-    public function __construct(Recipe $originalRecipe, Recipe $newRecipe, Lock $lock, string $rootDir)
-    {
-        $this->originalRecipe = $originalRecipe;
-        $this->newRecipe = $newRecipe;
-        $this->lock = $lock;
-        $this->rootDir = $rootDir;
+    public function __construct(
+        private Recipe $originalRecipe,
+        private Recipe $newRecipe,
+        private Lock $lock,
+        private string $rootDir,
+    ) {
     }
 
     public function getOriginalRecipe(): Recipe