diff --git a/.github/workflows/code_checks.yaml b/.github/workflows/code_checks.yaml
index 104ca89..b8fa110 100644
--- a/.github/workflows/code_checks.yaml
+++ b/.github/workflows/code_checks.yaml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: '8.2'
+          - php: '8.5'
             stability: prefer-stable
 
     name: PHP ${{ matrix.php }} tests - ${{ matrix.stability }}
diff --git a/.github/workflows/code_coverage.yaml b/.github/workflows/code_coverage.yaml
index 0088707..7b344e9 100644
--- a/.github/workflows/code_coverage.yaml
+++ b/.github/workflows/code_coverage.yaml
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.2
+          php-version: 8.5
           coverage: pcov
 
       # Implicitly runs `composer tests` in post update cmd. So PHPCS, MD and other static analysis is executed at
diff --git a/.github/workflows/tests-upcoming-symfony.yaml b/.github/workflows/tests-upcoming-symfony.yaml
index d13e6d0..cd24085 100644
--- a/.github/workflows/tests-upcoming-symfony.yaml
+++ b/.github/workflows/tests-upcoming-symfony.yaml
@@ -18,21 +18,21 @@ jobs:
         uses: shivammathur/setup-php@2.22.0
         with:
           coverage: none
-          php-version: '8.2'
+          php-version: '8.5'
           tools: composer:v2
           extensions: mbstring
           ini-values: date.timezone=UTC
 
       - name: 'Install project dependencies'
         env:
-          SYMFONY_REQUIRE: '6.4.x@dev'
+          SYMFONY_REQUIRE: '8.*'
         run: |
           composer global config --no-plugins allow-plugins.symfony/flex true
           composer global require --no-progress --no-scripts --no-plugins symfony/flex
           composer config minimum-stability dev
           composer config prefer-stable false
-          composer update --no-interaction --optimize-autoloader
-          composer require symfony/phpunit-bridge
+          composer update --no-interaction --optimize-autoloader --no-scripts
+          composer require --no-scripts symfony/phpunit-bridge
 
       - name: 'Run tests'
         env:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 65d1384..56d8a84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 # Changelog
+# Unreleased
+- Raise the Composer platform to PHP 8.5.
+- Update the code checks, code coverage and upcoming Symfony workflows to run on PHP 8.5.
+
 # 4.0.0
 - Drop SF4 support, Allow SF7.
 - Raise minimum PHP requirement to 8.2
diff --git a/composer.json b/composer.json
index 3040a38..8d94053 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
     "php-parallel-lint/php-parallel-lint": "^1.3",
     "phpmd/phpmd": "^2.13",
     "phpunit/phpunit": "^9.6|^10.4",
+    "rector/rector": "^2.4",
     "sebastian/phpcpd": "^4.1|^5.0|^6.0",
     "squizlabs/php_codesniffer": "^3.6",
     "malukenho/docheader": "^1.0",
@@ -38,15 +39,17 @@
       "phpcs": "vendor/bin/phpcs src tests --report=full --standard=phpcs.xml --extensions=php --warning-severity=0",
       "phpcpd": "vendor/bin/phpcpd src",
       "phpunit": "vendor/bin/phpunit --coverage-text",
-      "phpmd": "vendor/bin/phpmd src text phpmd.xml"
+      "phpmd": "@php -d \"error_reporting=E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED\" vendor/bin/phpmd src text phpmd.xml"
     },
+    "rector": "vendor/bin/rector process --dry-run",
+    "rector-fix": "vendor/bin/rector process",
       "post-update-cmd": [
         "@tests"
     ]
   },
   "config": {
     "platform": {
-      "php": "8.2"
+      "php": "8.5"
     },
     "preferred-install": {
       "*": "dist"
diff --git a/rector.php b/rector.php
new file mode 100644
index 0000000..70bd6fc
--- /dev/null
+++ b/rector.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return RectorConfig::configure()
+    ->withPaths([__DIR__.'/config', __DIR__.'/src', __DIR__.'/tests'])
+    ->withPhpSets()
+    ->withComposerBased(doctrine: true, symfony: true, phpunit: true)
+    ->withAttributesSets(doctrine: true, symfony: true, phpunit: true)
+    ->withSkip([
+        \Rector\Php84\Rector\MethodCall\NewMethodCallWithoutParenthesesRector::class,
+    ]);
diff --git a/src/HealthCheck/SessionHealthCheck.php b/src/HealthCheck/SessionHealthCheck.php
index d980a8b..bda6cdf 100644
--- a/src/HealthCheck/SessionHealthCheck.php
+++ b/src/HealthCheck/SessionHealthCheck.php
@@ -42,7 +42,7 @@ public function check(HealthReportInterface $report): HealthReportInterface
         if ($sessionStatus !== PHP_SESSION_DISABLED && $sessionStatus === PHP_SESSION_NONE) {
             try {
                 session_start();
-            } catch (Exception $e) {
+            } catch (Exception) {
                 return HealthReport::buildStatusDown('Session support is enabled but no session could be started.');
             }
             // Destroy the session
diff --git a/src/Value/HealthReport.php b/src/Value/HealthReport.php
index 3d0516e..07b65b5 100644
--- a/src/Value/HealthReport.php
+++ b/src/Value/HealthReport.php
@@ -26,21 +26,6 @@
  */
 class HealthReport implements HealthReportInterface, JsonSerializable
 {
-    /**
-     * @var string
-     */
-    private $status;
-
-    /**
-     * @var int
-     */
-    private $code;
-
-    /**
-     * @var string
-     */
-    private $message = '';
-
     public static function buildStatusUp(): HealthReportInterface
     {
         return new self(HealthReportInterface::STATUS_UP, HealthReportInterface::STATUS_CODE_UP);
@@ -51,11 +36,11 @@ public static function buildStatusDown($message = ''): HealthReportInterface
         return new self(HealthReportInterface::STATUS_DOWN, HealthReportInterface::STATUS_CODE_DOWN, $message);
     }
 
-    private function __construct(string $status, $code, string $message = '')
+    /**
+     * @param int $code
+     */
+    private function __construct(private readonly string $status, private $code, private readonly string $message = '')
     {
-        $this->status = $status;
-        $this->code = $code;
-        $this->message = $message;
     }
 
     public function isDown(): bool