diff --git a/framework/core/composer.json b/framework/core/composer.json
index 2ecc9ec07..86a9594b5 100644
--- a/framework/core/composer.json
+++ b/framework/core/composer.json
@@ -41,21 +41,21 @@
         "dflydev/fig-cookies": "^1.0.2",
         "doctrine/dbal": "^2.7",
         "franzl/whoops-middleware": "^0.4.0",
-        "illuminate/bus": "5.7.*",
-        "illuminate/cache": "5.7.*",
-        "illuminate/config": "5.7.*",
-        "illuminate/container": "5.7.*",
-        "illuminate/contracts": "5.7.*",
-        "illuminate/database": "5.7.*",
-        "illuminate/events": "5.7.*",
-        "illuminate/filesystem": "5.7.*",
-        "illuminate/hashing": "5.7.*",
-        "illuminate/mail": "5.7.*",
-        "illuminate/queue": "5.7.*",
-        "illuminate/session": "5.7.*",
-        "illuminate/support": "5.7.*",
-        "illuminate/validation": "5.7.*",
-        "illuminate/view": "5.7.*",
+        "illuminate/bus": "5.8.*",
+        "illuminate/cache": "5.8.*",
+        "illuminate/config": "5.8.*",
+        "illuminate/container": "5.8.*",
+        "illuminate/contracts": "5.8.*",
+        "illuminate/database": "5.8.*",
+        "illuminate/events": "5.8.*",
+        "illuminate/filesystem": "5.8.*",
+        "illuminate/hashing": "5.8.*",
+        "illuminate/mail": "5.8.*",
+        "illuminate/queue": "5.8.*",
+        "illuminate/session": "5.8.*",
+        "illuminate/support": "5.8.*",
+        "illuminate/validation": "5.8.*",
+        "illuminate/view": "5.8.*",
         "intervention/image": "^2.5.0",
         "laminas/laminas-diactoros": "^1.8.4",
         "laminas/laminas-httphandlerrunner": "^1.0",
diff --git a/framework/core/src/Http/Middleware/HandleErrors.php b/framework/core/src/Http/Middleware/HandleErrors.php
index d7965333e..a2d741884 100644
--- a/framework/core/src/Http/Middleware/HandleErrors.php
+++ b/framework/core/src/Http/Middleware/HandleErrors.php
@@ -41,7 +41,7 @@ class HandleErrors implements Middleware
      */
     protected $reporters;
 
-    public function __construct(Registry $registry, HttpFormatter $formatter, array $reporters)
+    public function __construct(Registry $registry, HttpFormatter $formatter, iterable $reporters)
     {
         $this->registry = $registry;
         $this->formatter = $formatter;
diff --git a/framework/core/src/Notification/NotificationRepository.php b/framework/core/src/Notification/NotificationRepository.php
index d1baf5c25..96030f98a 100644
--- a/framework/core/src/Notification/NotificationRepository.php
+++ b/framework/core/src/Notification/NotificationRepository.php
@@ -11,7 +11,6 @@ namespace Flarum\Notification;
 
 use Carbon\Carbon;
 use Flarum\User\User;
-use Illuminate\Database\Query\Expression;
 
 class NotificationRepository
 {
@@ -36,11 +35,8 @@ class NotificationRepository
             ->skip($offset)
             ->take($limit);
 
-        return Notification::select('notifications.*')
-            ->selectRaw('p.unread_count')
-            // Expression is necessary until Laravel 5.8.
-            // See https://github.com/laravel/framework/pull/28400
-            ->joinSub($primaries, 'p', 'notifications.id', '=', new Expression('p.id'))
+        return Notification::select('notifications.*', 'p.unread_count')
+            ->joinSub($primaries, 'p', 'notifications.id', '=', 'p.id')
             ->latest()
             ->get();
     }
diff --git a/framework/core/tests/integration/setup.php b/framework/core/tests/integration/setup.php
index 8403acf5c..afe5a6063 100644
--- a/framework/core/tests/integration/setup.php
+++ b/framework/core/tests/integration/setup.php
@@ -14,12 +14,12 @@ use Flarum\Install\Installation;
 
 require __DIR__.'/../../vendor/autoload.php';
 
-$host = env('DB_HOST', 'localhost');
-$port = intval(env('DB_PORT', 3306));
-$name = env('DB_DATABASE', 'flarum_test');
-$user = env('DB_USERNAME', 'root');
-$pass = env('DB_PASSWORD', '');
-$pref = env('DB_PREFIX', '');
+$host = getenv('DB_HOST') ?: 'localhost';
+$port = intval(getenv('DB_PORT') ?: 3306);
+$name = getenv('DB_DATABASE') ?: 'flarum_test';
+$user = getenv('DB_USERNAME') ?: 'root';
+$pass = getenv('DB_PASSWORD') ?: '';
+$pref = getenv('DB_PREFIX') ?: '';
 
 echo "Connecting to database $name at $host:$port.\n";
 echo "Logging in as $user with password '$pass'.\n";
@@ -48,15 +48,9 @@ $pipeline = $installation
     ->configPath('config.php')
     ->debugMode(true)
     ->baseUrl(BaseUrl::fromString('http://localhost'))
-    ->databaseConfig(new DatabaseConfig(
-        'mysql',
-        env('DB_HOST', 'localhost'),
-        intval(env('DB_PORT', 3306)),
-        env('DB_DATABASE', 'flarum_test'),
-        env('DB_USERNAME', 'root'),
-        env('DB_PASSWORD', ''),
-        env('DB_PREFIX', '')
-    ))
+    ->databaseConfig(
+        new DatabaseConfig('mysql', $host, $port, $name, $user, $pass, $pref)
+    )
     ->adminUser(new AdminUser(
         'admin',
         'secret',