diff --git a/src/Builder.php b/src/Builder.php
index 0393805b..32128143 100644
--- a/src/Builder.php
+++ b/src/Builder.php
@@ -15,13 +15,6 @@ interface Builder
 {
     public const DEFAULT_PRIORITY = 0;
 
-    /**
-     * Changes the generator to handle the files
-     *
-     * @deprecated This is deprecated in favour of using the correct naming constructor.
-     */
-    public function setGenerator(Generator $generator): Builder;
-
     /**
      * Add a file to be loaded
      */
@@ -58,15 +51,6 @@ public function addPackage(string $className, array $constructArguments = []): B
      */
     public function setProfileName(string $profileName): Builder;
 
-    /**
-     * Mark the container to be used as development mode
-     *
-     * @deprecated this method will be removed in favour of a more explicit name.
-     *
-     * @see enableDebugging
-     */
-    public function useDevelopmentMode(): Builder;
-
     /**
      * Configure the container to track file updates
      */
diff --git a/src/Compiler.php b/src/Compiler.php
index 95209cf0..81e0f7e7 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -18,7 +18,8 @@
 use function is_array;
 use function is_string;
 
-final class Compiler
+/** @internal */
+final readonly class Compiler
 {
     private const DEFAULT_PASS_CONFIG = [null, PassConfig::TYPE_BEFORE_OPTIMIZATION, 0];
 
@@ -82,7 +83,7 @@ private function getContainerContent(
         $options['as_files'] = true;
 
         $options['inline_factories']    = $options['debug'] === false;
-        $options['inline_class_loader'] = $options['debug'] === false;
+        $options['inline_class_loader'] = $options['inline_factories'];
 
         $content = (new PhpDumper($container))->dump($options);
         assert(is_array($content));
diff --git a/src/Compiler/DumpXmlContainer.php b/src/Compiler/DumpXmlContainer.php
index 3fdb61a6..d15f5b78 100644
--- a/src/Compiler/DumpXmlContainer.php
+++ b/src/Compiler/DumpXmlContainer.php
@@ -8,7 +8,7 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Dumper\XmlDumper;
 
-final class DumpXmlContainer implements CompilerPassInterface
+final readonly class DumpXmlContainer implements CompilerPassInterface
 {
     public function __construct(private ConfigCacheInterface $configCache)
     {
diff --git a/src/Compiler/ParameterBag.php b/src/Compiler/ParameterBag.php
index 36b057a0..2e36f70b 100644
--- a/src/Compiler/ParameterBag.php
+++ b/src/Compiler/ParameterBag.php
@@ -10,6 +10,8 @@
  * Injects parameters into the container
  *
  * You should use this to define dynamic parameters using PHP
+ *
+ * @internal
  */
 final class ParameterBag implements CompilerPassInterface
 {
diff --git a/src/Config/ContainerConfiguration.php b/src/Config/ContainerConfiguration.php
index c64378d9..bc83186d 100644
--- a/src/Config/ContainerConfiguration.php
+++ b/src/Config/ContainerConfiguration.php
@@ -20,6 +20,7 @@
 
 use const DIRECTORY_SEPARATOR;
 
+/** @internal */
 final class ContainerConfiguration
 {
     public const CLASS_NAME = 'AppContainer';
diff --git a/src/ContainerBuilder.php b/src/ContainerBuilder.php
index 9aa752e9..5015b8bb 100644
--- a/src/ContainerBuilder.php
+++ b/src/ContainerBuilder.php
@@ -15,7 +15,7 @@
 use function assert;
 use function is_bool;
 
-final class ContainerBuilder implements Builder
+final readonly class ContainerBuilder implements Builder
 {
     public function __construct(
         private ContainerConfiguration $config,
@@ -25,19 +25,6 @@ public function __construct(
         $this->setDefaultConfiguration();
     }
 
-    /**
-     * @deprecated Use the named constructor according to the generator
-     *
-     * @see ContainerBuilder::xml()
-     * @see ContainerBuilder::yaml()
-     * @see ContainerBuilder::php()
-     * @see ContainerBuilder::delegating()
-     */
-    public static function default(string $configurationFile, string $namespace): self
-    {
-        return self::xml($configurationFile, $namespace);
-    }
-
     /** @param class-string<SymfonyBuilder> $builderClass */
     public static function xml(
         string $configurationFile,
@@ -100,13 +87,6 @@ private function setDefaultConfiguration(): void
         $this->config->addPass($this->parameterBag);
     }
 
-    public function setGenerator(Generator $generator): Builder
-    {
-        $this->generator = $generator;
-
-        return $this;
-    }
-
     public function addFile(string $file): Builder
     {
         $this->config->addFile($file);
@@ -151,11 +131,6 @@ public function setProfileName(string $profileName): Builder
         return $this;
     }
 
-    public function useDevelopmentMode(): Builder
-    {
-        return $this->enableDebugging();
-    }
-
     public function enableDebugging(): Builder
     {
         $this->parameterBag->set('app.devmode', true);
diff --git a/src/Generator.php b/src/Generator.php
index 3c81d4e3..67ce764f 100644
--- a/src/Generator.php
+++ b/src/Generator.php
@@ -13,14 +13,15 @@
 use function assert;
 use function is_a;
 
-abstract class Generator
+/** @internal */
+abstract readonly class Generator
 {
     private Compiler $compiler;
 
     /** @param class-string<SymfonyBuilder> $builderClass */
     public function __construct(
-        private readonly string $configurationFile,
-        private readonly string $builderClass = SymfonyBuilder::class,
+        private string $configurationFile,
+        private string $builderClass = SymfonyBuilder::class,
     ) {
         $this->compiler = new Compiler();
     }
diff --git a/src/Generators/Delegating.php b/src/Generators/Delegating.php
index 4e0eb481..ed9f3739 100644
--- a/src/Generators/Delegating.php
+++ b/src/Generators/Delegating.php
@@ -15,8 +15,10 @@
 
 /**
  * The dependency injection generator that allows XML, YAML and PHP files
+ *
+ * @internal
  */
-final class Delegating extends Generator
+final readonly class Delegating extends Generator
 {
     /** @inheritDoc */
     public function getLoader(SymfonyBuilder $container, array $paths, ?string $profileName = null): LoaderInterface
diff --git a/src/Generators/Php.php b/src/Generators/Php.php
index 85c34b00..b15ed9fc 100644
--- a/src/Generators/Php.php
+++ b/src/Generators/Php.php
@@ -11,8 +11,10 @@
 
 /**
  * The dependency injection generator for PHP files
+ *
+ * @internal
  */
-final class Php extends Generator
+final readonly class Php extends Generator
 {
     /** @inheritDoc */
     public function getLoader(SymfonyBuilder $container, array $paths, ?string $profileName = null): LoaderInterface
diff --git a/src/Generators/Xml.php b/src/Generators/Xml.php
index dba92122..3b1242c9 100644
--- a/src/Generators/Xml.php
+++ b/src/Generators/Xml.php
@@ -11,8 +11,10 @@
 
 /**
  * The dependency injection generator for XML files
+ *
+ * @internal
  */
-final class Xml extends Generator
+final readonly class Xml extends Generator
 {
     /** @inheritDoc */
     public function getLoader(SymfonyBuilder $container, array $paths, ?string $profileName = null): LoaderInterface
diff --git a/src/Generators/Yaml.php b/src/Generators/Yaml.php
index 668057ba..e33222f2 100644
--- a/src/Generators/Yaml.php
+++ b/src/Generators/Yaml.php
@@ -11,8 +11,10 @@
 
 /**
  * The dependency injection generator for YAML files
+ *
+ * @internal
  */
-final class Yaml extends Generator
+final readonly class Yaml extends Generator
 {
     /** @inheritDoc */
     public function getLoader(SymfonyBuilder $container, array $paths, ?string $profileName = null): LoaderInterface
diff --git a/src/Testing/MakeServicesPublic.php b/src/Testing/MakeServicesPublic.php
index 1f2fbc45..a4ee234f 100644
--- a/src/Testing/MakeServicesPublic.php
+++ b/src/Testing/MakeServicesPublic.php
@@ -6,6 +6,7 @@
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
+/** @internal */
 final class MakeServicesPublic implements CompilerPassInterface
 {
     /**
diff --git a/test/ContainerBuilderTest.php b/test/ContainerBuilderTest.php
index d61f4bb7..19900330 100644
--- a/test/ContainerBuilderTest.php
+++ b/test/ContainerBuilderTest.php
@@ -59,7 +59,6 @@ public function namedConstructorsShouldSimplifyTheObjectCreation(
     /** @return iterable<string, array{string, Generator, 2?: class-string<\Symfony\Component\DependencyInjection\ContainerBuilder>}> */
     public static function supportedFormats(): iterable
     {
-        yield 'default' => ['default', new Generators\Xml(__FILE__)];
         yield 'xml' => ['xml', new Generators\Xml(__FILE__)];
         yield 'yaml' => ['yaml', new Generators\Yaml(__FILE__)];
         yield 'php' => ['php', new Generators\Php(__FILE__)];
@@ -99,18 +98,6 @@ public function constructShouldReceiveTheDependenciesAsArguments(): void
         self::assertFalse($this->parameterBag->get('app.devmode'));
     }
 
-    #[PHPUnit\Test]
-    public function setGeneratorShouldChangeTheAttributeAndReturnSelf(): void
-    {
-        $builder   = new ContainerBuilder($this->config, $this->generator, $this->parameterBag);
-        $generator = $this->createMock(Generator::class);
-        $expected  = new ContainerBuilder($this->config, $generator, $this->parameterBag);
-
-        // @phpstan-ignore-next-line method is deprecated and will be removed in the next major version
-        self::assertSame($builder, $builder->setGenerator($generator));
-        self::assertEquals($expected, $builder);
-    }
-
     #[PHPUnit\Test]
     public function addFileShouldAppendANewFileOnTheListAndReturnSelf(): void
     {