diff --git a/src/Core/Convert.php b/src/Core/Convert.php
index 3db7472a2..161750ae2 100644
--- a/src/Core/Convert.php
+++ b/src/Core/Convert.php
@@ -225,47 +225,6 @@ class Convert
         return html_entity_decode($val ?? '', ENT_QUOTES, 'UTF-8');
     }
 
-    /**
-     * Convert a XML string to a PHP array recursively. Do not
-     * call this function directly.
-     *
-     * @param SimpleXMLElement $xml
-     *
-     * @return mixed
-     * @deprecated 4.11.0 Will be removed without equivalent functionality
-     */
-    protected static function recursiveXMLToArray($xml)
-    {
-        Deprecation::notice('4.11.0', 'Will be removed without equivalent functionality');
-        $x = null;
-        if ($xml instanceof SimpleXMLElement) {
-            $attributes = $xml->attributes();
-            foreach ($attributes as $k => $v) {
-                if ($v) {
-                    $a[$k] = (string) $v;
-                }
-            }
-            $x = $xml;
-            $xml = get_object_vars($xml);
-        }
-        if (is_array($xml)) {
-            if (count($xml ?? []) === 0) {
-                return (string)$x;
-            } // for CDATA
-            $r = [];
-            foreach ($xml as $key => $value) {
-                $r[$key] = self::recursiveXMLToArray($value);
-            }
-            // Attributes
-            if (isset($a)) {
-                $r['@'] = $a;
-            }
-            return $r;
-        }
-
-        return (string) $xml;
-    }
-
     /**
      * Create a link if the string is a valid URL
      *
diff --git a/src/Core/CustomMethods.php b/src/Core/CustomMethods.php
index 8841a8c25..465cb5b07 100644
--- a/src/Core/CustomMethods.php
+++ b/src/Core/CustomMethods.php
@@ -227,7 +227,6 @@ trait CustomMethods
      *
      * @param object $object
      * @return array
-     * @deprecated 4.13.0 Will be replaced by findMethodsFrom() in CMS 5
      */
     protected function findMethodsFrom($object)
     {
diff --git a/src/i18n/Data/Sources.php b/src/i18n/Data/Sources.php
index f6bebdd7a..0d285fd75 100644
--- a/src/i18n/Data/Sources.php
+++ b/src/i18n/Data/Sources.php
@@ -19,15 +19,6 @@ class Sources implements Resettable
     use Injectable;
     use Configurable;
 
-    /**
-     * List of prioritised modules, in lowest to highest priority.
-     *
-     * @config
-     * @var array
-     * @deprecated 4.0.0 Use SilverStripe\Core\Manifest\ModuleManifest.module_priority instead
-     */
-    private static $module_priority = [];
-
     /**
      * Get sorted modules
      *