diff --git a/system/Boot.php b/system/Boot.php
index 5b228664146f..85b983c19d89 100644
--- a/system/Boot.php
+++ b/system/Boot.php
@@ -304,7 +304,6 @@ protected static function checkMissingExtensions(): void
 
         foreach ([
             'intl',
-            'json',
             'mbstring',
         ] as $extension) {
             if (! extension_loaded($extension)) {
diff --git a/system/CodeIgniter.php b/system/CodeIgniter.php
index c87ff78e8348..26a64575cc98 100644
--- a/system/CodeIgniter.php
+++ b/system/CodeIgniter.php
@@ -15,7 +15,6 @@
 use CodeIgniter\Cache\ResponseCache;
 use CodeIgniter\Debug\Timer;
 use CodeIgniter\Events\Events;
-use CodeIgniter\Exceptions\FrameworkException;
 use CodeIgniter\Exceptions\LogicException;
 use CodeIgniter\Exceptions\PageNotFoundException;
 use CodeIgniter\Filters\Filters;
@@ -192,38 +191,6 @@ public function initialize()
         date_default_timezone_set($this->config->appTimezone ?? 'UTC');
     }
 
-    /**
-     * Checks system for missing required PHP extensions.
-     *
-     * @return void
-     *
-     * @throws FrameworkException
-     *
-     * @codeCoverageIgnore
-     *
-     * @deprecated 4.5.0 Moved to system/bootstrap.php.
-     */
-    protected function resolvePlatformExtensions()
-    {
-        $requiredExtensions = [
-            'intl',
-            'json',
-            'mbstring',
-        ];
-
-        $missingExtensions = [];
-
-        foreach ($requiredExtensions as $extension) {
-            if (! extension_loaded($extension)) {
-                $missingExtensions[] = $extension;
-            }
-        }
-
-        if ($missingExtensions !== []) {
-            throw FrameworkException::forMissingExtension(implode(', ', $missingExtensions));
-        }
-    }
-
     /**
      * Initializes Kint
      *
diff --git a/user_guide_src/source/changelogs/v4.7.0.rst b/user_guide_src/source/changelogs/v4.7.0.rst
index fd64911a6561..9399095c1d44 100644
--- a/user_guide_src/source/changelogs/v4.7.0.rst
+++ b/user_guide_src/source/changelogs/v4.7.0.rst
@@ -64,6 +64,7 @@ Removed Deprecated Items
 
 - **Text Helper:** The deprecated types in ``random_string()`` function: ``basic``, ``md5``, and ``sha1`` has been removed.
 - **BaseModel:** The deprecated method ``transformDataRowToArray()`` has been removed.
+- **CodeIgniter:** The deprecated ``CodeIgniter\CodeIgniter::resolvePlatformExtensions()`` has been removed.
 
 ************
 Enhancements
diff --git a/user_guide_src/source/intro/requirements.rst b/user_guide_src/source/intro/requirements.rst
index 4c956e631f0e..2de0b5c5b7d3 100644
--- a/user_guide_src/source/intro/requirements.rst
+++ b/user_guide_src/source/intro/requirements.rst
@@ -13,8 +13,7 @@ PHP and Required Extensions
 `PHP <https://www.php.net/>`_ version 8.2 or newer is required, with the following PHP extensions are enabled:
 
   - `intl <https://www.php.net/manual/en/intl.requirements.php>`_
-  - `mbstring <https://www.php.net/manual/en/mbstring.requirements.php>`_
-  - `json <https://www.php.net/manual/en/json.requirements.php>`_
+  - `mbstring <https://www.php.net/manual/en/mbstring.installation.php>`_
 
 .. warning::
     - The end of life date for PHP 7.4 was November 28, 2022.