diff --git a/.upgrade.yml b/.upgrade.yml
index 3bbece19b..d57c41765 100644
--- a/.upgrade.yml
+++ b/.upgrade.yml
@@ -1284,6 +1284,12 @@ warnings:
       message: 'Removed SilverStripe\ORM\FieldType\DBDate->day_before()'
     'days_between()':
       message: 'Removed SilverStripe\ORM\FieldType\DBDate->days_between()'
+    'SilverStripe\Security\Permission::get_declared_permissions_list()':
+      message: 'Deprecated'
+    'SilverStripe\Security\Permission::get_label_for_permission()':
+      message: 'Deprecated'
+    'SilverStripe\Security\Permission::traverse_declared_permissions()':
+      message: 'Deprecated'
     'SilverStripe\Control\Session::get_all()':
       message: 'Session can not be accessed statically and `get_all()` is now called `getAll()'
     'SilverStripe\Control\Session::clear_all()':
@@ -1319,6 +1325,10 @@ warnings:
       replacement: 'writeJavascriptToBody'
     'SilverStripe\Forms\Formfield->dontEscape':
       message: 'FormField::$dontEscape has been removed. Escaping is now managed on a class by class basis.'
+    'SilverStripe\Security\Permission::$declared_permissions':
+      message: 'Deprecated'
+    'SilverStripe\Security\Permission::$declared_permissions_list':
+      message: 'Deprecated'
   functions:
     'file_get_contents()':
       message: 'Use new asset abstraction'
diff --git a/src/Security/Permission.php b/src/Security/Permission.php
index 6c2553c13..39414ff28 100644
--- a/src/Security/Permission.php
+++ b/src/Security/Permission.php
@@ -69,6 +69,7 @@ class Permission extends DataObject implements TemplateGlobalProvider, Resettabl
      * Method to globally disable "strict" checking, which means a permission
      * will be granted if the key does not exist at all.
      *
+     * @deprecated 4.4.0
      * @var array
      */
     private static $declared_permissions = null;
@@ -76,6 +77,7 @@ class Permission extends DataObject implements TemplateGlobalProvider, Resettabl
     /**
      * Linear list of declared permissions in the system.
      *
+     * @deprecated 4.4.0
      * @var array
      */
     private static $declared_permissions_list = null;
@@ -650,6 +652,7 @@ class Permission extends DataObject implements TemplateGlobalProvider, Resettabl
      * Get a linear list of the permissions in the system.
      *
      * @return array Linear list of declared permissions in the system.
+     * @deprecated 4.4.0
      */
     public static function get_declared_permissions_list()
     {
@@ -673,6 +676,7 @@ class Permission extends DataObject implements TemplateGlobalProvider, Resettabl
      *
      * @param string $perm Permission code
      * @return string Label for the given permission, or the permission itself if the label doesn't exist
+     * @deprecated 4.4.0
      */
     public static function get_label_for_permission($perm)
     {
@@ -690,6 +694,7 @@ class Permission extends DataObject implements TemplateGlobalProvider, Resettabl
      * @param array $declared Nested structure of permissions.
      * @param array $list List of permissions in the structure. The result will be
      *              written to this array.
+     * @deprecated 4.4.0
      */
     protected static function traverse_declared_permissions($declared, &$list)
     {