diff --git a/system/Config/Services.php b/system/Config/Services.php
index ffca4fa804ff..6bd16cc30213 100644
--- a/system/Config/Services.php
+++ b/system/Config/Services.php
@@ -117,7 +117,7 @@ public static function cache(?Cache $config = null, bool $getShared = true)
             return static::getSharedInstance('cache', $config);
         }
 
-        $config ??= new Cache();
+        $config ??= config(Cache::class);
 
         return CacheFactory::getHandler($config);
     }
diff --git a/system/HTTP/UserAgent.php b/system/HTTP/UserAgent.php
index 4b579229d88f..1ccc2109c119 100644
--- a/system/HTTP/UserAgent.php
+++ b/system/HTTP/UserAgent.php
@@ -102,7 +102,7 @@ class UserAgent
      */
     public function __construct(?UserAgents $config = null)
     {
-        $this->config = $config ?? new UserAgents();
+        $this->config = $config ?? config(UserAgents::class);
 
         if (isset($_SERVER['HTTP_USER_AGENT'])) {
             $this->agent = trim($_SERVER['HTTP_USER_AGENT']);