diff --git a/system/core/Controller.php b/system/core/Controller.php
index aeccd60ee4c..3713ae06308 100644
--- a/system/core/Controller.php
+++ b/system/core/Controller.php
@@ -50,6 +50,7 @@
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/userguide3/general/controllers.html
  */
+#[AllowDynamicProperties]
 class CI_Controller {
 
 	/**
diff --git a/system/core/Loader.php b/system/core/Loader.php
index 648b7cfc7c2..32f3873262d 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -49,6 +49,7 @@
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/userguide3/libraries/loader.html
  */
+#[AllowDynamicProperties]
 class CI_Loader {
 
 	// All these are set automatically. Don't mess with them.
diff --git a/system/core/Router.php b/system/core/Router.php
index e0fb922f1a6..3c88c4c7a2a 100644
--- a/system/core/Router.php
+++ b/system/core/Router.php
@@ -49,6 +49,7 @@
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/userguide3/general/routing.html
  */
+#[AllowDynamicProperties]
 class CI_Router {
 
 	/**
diff --git a/system/core/URI.php b/system/core/URI.php
index 1e948588354..a06d5c291c2 100644
--- a/system/core/URI.php
+++ b/system/core/URI.php
@@ -49,6 +49,7 @@
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/userguide3/libraries/uri.html
  */
+#[AllowDynamicProperties]
 class CI_URI {
 
 	/**
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index de03a418567..6cbd7026e91 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -51,6 +51,7 @@
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/userguide3/database/
  */
+#[AllowDynamicProperties]
 abstract class CI_DB_driver {
 
 	/**