diff --git a/flight/Engine.php b/flight/Engine.php
index 4a1ed3f..bd435c2 100644
--- a/flight/Engine.php
+++ b/flight/Engine.php
@@ -173,8 +173,8 @@ class Engine
         $this->before('start', function () use ($self) {
             // Enable error handling
             if ($self->get('flight.handle_errors')) {
-                set_error_handler(array($self, 'handleError'));
-                set_exception_handler(array($self, 'handleException'));
+                set_error_handler([$self, 'handleError']);
+                set_exception_handler([$self, 'handleException']);
             }
 
             // Set case-sensitivity
diff --git a/flight/Flight.php b/flight/Flight.php
index a24a8f3..39fe83e 100644
--- a/flight/Flight.php
+++ b/flight/Flight.php
@@ -98,7 +98,7 @@ class Flight
      * @param  ?Closure(T $instance): void $callback Perform actions with the instance
      * @return void
      */
-    static function register($name, $class, $params = array(), $callback = null)
+    static function register($name, $class, $params = [], $callback = null)
     {
         static::__callStatic('register', func_get_args());
     }
diff --git a/flight/net/Request.php b/flight/net/Request.php
index 99160d7..207df19 100644
--- a/flight/net/Request.php
+++ b/flight/net/Request.php
@@ -146,7 +146,7 @@ final class Request
      *
      * @param array<string, mixed> $config Request configuration
      */
-    public function __construct($config = array())
+    public function __construct($config = [])
     {
         // Default properties
         if (empty($config)) {
@@ -312,7 +312,7 @@ final class Request
      */
     public static function parseQuery(string $url): array
     {
-        $params = array();
+        $params = [];
 
         $args = parse_url($url);
         if (isset($args['query'])) {
diff --git a/flight/util/Collection.php b/flight/util/Collection.php
index 01ddb81..39c03bc 100644
--- a/flight/util/Collection.php
+++ b/flight/util/Collection.php
@@ -15,10 +15,6 @@ use Countable;
 use Iterator;
 use JsonSerializable;
 
-if (!interface_exists('JsonSerializable')) {
-    require_once __DIR__ . '/LegacyJsonSerializable.php'; // @codeCoverageIgnore
-}
-
 /**
  * The Collection class allows you to access a set of data
  * using both array and object notation.
diff --git a/flight/util/LegacyJsonSerializable.php b/flight/util/LegacyJsonSerializable.php
deleted file mode 100644
index 39e1721..0000000
--- a/flight/util/LegacyJsonSerializable.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-declare(strict_types=1);
-/**
- * Flight: An extensible micro-framework.
- *
- * @copyright   Copyright (c) 2011, Mike Cao <mike@mikecao.com>
- * @license     MIT, http://flightphp.com/license
- */
-interface LegacyJsonSerializable
-{
-    /**
-     * Gets the collection data which can be serialized to JSON.
-     * @return mixed Collection data which can be serialized by <b>json_encode</b>
-     */
-    public function jsonSerialize();
-}