diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b6a0777..9aecb50 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
         strategy:
             matrix:
-                php: ['8.2', '8.3']
+                php: ['8.3']
 
         steps:
             -   name: Checkout Code
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14669eb..40af76c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+2.3.0
+=====
+
+* (feature) Add proper types for configurable bundle extension.
+* (internal) Update CI.
+* (improvement) Require Symfony 7 and PHP 8.3+
+
+
 2.2.0
 =====
 
diff --git a/composer.json b/composer.json
index 18ea169..787bb8e 100644
--- a/composer.json
+++ b/composer.json
@@ -11,15 +11,15 @@
 	],
 	"homepage": "https://github.com/21TORR/bundle-helpers",
 	"require": {
-		"php": ">= 8.2",
-		"symfony/config": "^6.4 || ^7.0",
-		"symfony/dependency-injection": "^6.4 || ^7.0",
-		"symfony/http-kernel": "^6.4 || ^7.0"
+		"php": ">= 8.3",
+		"symfony/config": "^7.0",
+		"symfony/dependency-injection": "^7.0",
+		"symfony/http-kernel": "^7.0"
 	},
 	"require-dev": {
 		"bamarni/composer-bin-plugin": "^1.8.2",
 		"roave/security-advisories": "dev-latest",
-		"symfony/phpunit-bridge": "^7.0"
+		"symfony/phpunit-bridge": "^7.1"
 	},
 	"autoload": {
 		"psr-4": {
@@ -53,10 +53,11 @@
 		],
 		"lint": [
 			"@composer bin c-norm normalize \"$(pwd)/composer.json\" --indent-style tab --indent-size 1 --dry-run --ansi",
-			"vendor-bin/cs-fixer/vendor/bin/php-cs-fixer fix --diff --config vendor-bin/cs-fixer/vendor/21torr/php-cs-fixer/.php-cs-fixer.dist.php --dry-run --no-interaction --ansi --using-cache no"
+			"vendor-bin/cs-fixer/vendor/bin/php-cs-fixer check --diff --config vendor-bin/cs-fixer/vendor/21torr/php-cs-fixer/.php-cs-fixer.dist.php --no-interaction --ansi"
 		],
 		"test": [
-			"vendor-bin/test/vendor/bin/phpstan analyze -c phpstan.neon . --ansi"
+			"simple-phpunit",
+			"vendor-bin/phpstan/vendor/bin/phpstan analyze -c phpstan.neon . --ansi -v"
 		]
 	}
 }
diff --git a/phpstan.neon b/phpstan.neon
index 05b3505..a2774e6 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,8 @@
 includes:
-    - vendor-bin/test/vendor/21torr/php-cs/phpstan/lib.neon
+	- vendor-bin/janus/vendor/21torr/janus/phpstan/lib.neon
 
+# If you use simple-phpunit, you need to uncomment the following line.
+# Always make sure to first run simple-phpunit and then PHPStan.
 parameters:
-    level: 9
+	bootstrapFiles:
+		- vendor/bin/.phpunit/phpunit/vendor/autoload.php
diff --git a/phpunit.xml b/phpunit.xml
index ce2a66e..de0b74b 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
          colors="true"
          bootstrap="vendor/autoload.php"
 >
@@ -11,6 +11,7 @@
         <server name="SYMFONY_PHPUNIT_REMOVE" value="" />
         <server name="SYMFONY_PHPUNIT_VERSION" value="9.5" />
         <env name="SYMFONY_DEPRECATIONS_HELPER" value="max[direct]=0"/>
+        <env name="SYMFONY_PHPUNIT_VERSION" value="9.6" />
     </php>
 
     <testsuites>
diff --git a/src/Bundle/BundleExtension.php b/src/Bundle/BundleExtension.php
index 792ee4d..35557b7 100644
--- a/src/Bundle/BundleExtension.php
+++ b/src/Bundle/BundleExtension.php
@@ -18,7 +18,6 @@ class BundleExtension extends Extension
 	private BundleInterface $bundle;
 	private ?string $alias;
 
-
 	public function __construct (
 		BundleInterface $bundle,
 		?string $alias = null,
@@ -28,7 +27,6 @@ public function __construct (
 		$this->alias = $alias;
 	}
 
-
 	/**
 	 * @inheritDoc
 	 */
@@ -36,14 +34,13 @@ public function load (array $configs, ContainerBuilder $container) : void
 	{
 		$configDir = "{$this->bundle->getPath()}/config";
 
-		if (\is_file("{$configDir}/services.yaml"))
+		if (is_file("{$configDir}/services.yaml"))
 		{
 			$loader = new YamlFileLoader($container, new FileLocator($configDir));
 			$loader->load("services.yaml");
 		}
 	}
 
-
 	/**
 	 * @inheritDoc
 	 */
@@ -56,17 +53,17 @@ public function getAlias () : string
 
 		$className = \get_class($this->bundle);
 
-		if ('Bundle' !== \substr($className, -6))
+		if ('Bundle' !== substr($className, -6))
 		{
-			throw new BundleHelpersException(\sprintf(
+			throw new BundleHelpersException(sprintf(
 				"The bundle does not follow the naming convention; you must pass an explicit alias. Its name should end on 'Bundle', but it is '%s'.",
 				$className,
 			));
 		}
 
-		$classBaseNameForNamespacedClass = \strrchr($className, '\\');
+		$classBaseNameForNamespacedClass = strrchr($className, '\\');
 		$classBaseName = false !== $classBaseNameForNamespacedClass
-			? \substr($classBaseNameForNamespacedClass, 1, -6)
+			? substr($classBaseNameForNamespacedClass, 1, -6)
 			: $className;
 
 		return Container::underscore($classBaseName);
diff --git a/src/Bundle/ConfigurableBundleExtension.php b/src/Bundle/ConfigurableBundleExtension.php
index 5c3abcb..d4049b5 100644
--- a/src/Bundle/ConfigurableBundleExtension.php
+++ b/src/Bundle/ConfigurableBundleExtension.php
@@ -13,10 +13,12 @@
 class ConfigurableBundleExtension extends BundleExtension
 {
 	private ConfigurationInterface $config;
-	/** @var callable */
+
+	/** @var callable(array, ContainerBuilder): void */
 	private $callback;
 
 	/**
+	 * @param callable(array, ContainerBuilder): void $callback
 	 */
 	public function __construct (
 		BundleInterface $bundle,
@@ -30,7 +32,6 @@ public function __construct (
 		$this->callback = $callback;
 	}
 
-
 	/**
 	 * @inheritDoc
 	 */
diff --git a/tests/Bundle/BundleExtensionTest.php b/tests/Bundle/BundleExtensionTest.php
index 1d33ae0..ba10eb1 100644
--- a/tests/Bundle/BundleExtensionTest.php
+++ b/tests/Bundle/BundleExtensionTest.php
@@ -8,6 +8,9 @@
 use Torr\BundleHelpers\Bundle\BundleExtension;
 use Torr\BundleHelpers\Exception\BundleHelpersException;
 
+/**
+ * @internal
+ */
 final class BundleExtensionTest extends TestCase
 {
 	/**
diff --git a/vendor-bin/c-norm/composer.json b/vendor-bin/c-norm/composer.json
index 6294b6a..29d96fe 100644
--- a/vendor-bin/c-norm/composer.json
+++ b/vendor-bin/c-norm/composer.json
@@ -1,10 +1,11 @@
 {
-    "require": {
-        "ergebnis/composer-normalize": "^2.41"
-    },
-    "config": {
-        "allow-plugins": {
-            "ergebnis/composer-normalize": true
-        }
-    }
+	"require-dev": {
+		"ergebnis/composer-normalize": "^2.42",
+		"roave/security-advisories": "dev-latest"
+	},
+	"config": {
+		"allow-plugins": {
+			"ergebnis/composer-normalize": true
+		}
+	}
 }
diff --git a/vendor-bin/cs-fixer/composer.json b/vendor-bin/cs-fixer/composer.json
index 74c4a41..ceadfce 100644
--- a/vendor-bin/cs-fixer/composer.json
+++ b/vendor-bin/cs-fixer/composer.json
@@ -1,5 +1,6 @@
 {
-    "require": {
-        "21torr/php-cs-fixer": "^1.0.2"
-    }
+	"require-dev": {
+		"21torr/php-cs-fixer": "^1.1.1",
+		"roave/security-advisories": "dev-latest"
+	}
 }
diff --git a/vendor-bin/janus/composer.json b/vendor-bin/janus/composer.json
new file mode 100644
index 0000000..8b7c3d9
--- /dev/null
+++ b/vendor-bin/janus/composer.json
@@ -0,0 +1,8 @@
+{
+    "require": {
+        "21torr/janus": "^1.3"
+    },
+    "require-dev": {
+        "roave/security-advisories": "dev-latest"
+    }
+}
diff --git a/vendor-bin/phpstan/composer.json b/vendor-bin/phpstan/composer.json
new file mode 100644
index 0000000..cf165ff
--- /dev/null
+++ b/vendor-bin/phpstan/composer.json
@@ -0,0 +1,21 @@
+{
+	"require": {
+		"php": "^8.3"
+	},
+	"require-dev": {
+		"phpstan/extension-installer": "^1.3.1",
+		"phpstan/phpstan": "^1.11",
+		"phpstan/phpstan-deprecation-rules": "^1.2",
+		"phpstan/phpstan-doctrine": "^1.4",
+		"phpstan/phpstan-phpunit": "^1.4",
+		"phpstan/phpstan-symfony": "^1.4",
+		"roave/security-advisories": "dev-latest",
+		"staabm/phpstan-todo-by": "^0.1.25"
+	},
+	"config": {
+		"sort-packages": true,
+		"allow-plugins": {
+			"phpstan/extension-installer": true
+		}
+	}
+}
diff --git a/vendor-bin/test/composer.json b/vendor-bin/test/composer.json
deleted file mode 100644
index 8105a33..0000000
--- a/vendor-bin/test/composer.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-	"require": {
-		"21torr/php-cs": "^4.0.4"
-	},
-	"config": {
-		"allow-plugins": {
-			"phpstan/extension-installer": true,
-			"ergebnis/composer-normalize": true
-		}
-	}
-}