diff --git a/administrator/components/com_admin/script.php b/administrator/components/com_admin/script.php
index dcd9bc003a1a9..6d1bb748d0e06 100644
--- a/administrator/components/com_admin/script.php
+++ b/administrator/components/com_admin/script.php
@@ -520,13 +520,6 @@ public function deleteUnexistingFiles($dryRun = false, $suppressOutput = false)
 
         $this->fixFilenameCasing();
 
-        /**
-         * Fix filesystem permissions when updating a new 5.2.0 installation.
-         *
-         * @todo: Remove in 6.0
-         */
-        $this->fixFilesystemPermissions();
-
         if ($suppressOutput === false && \count($status['folders_errors'])) {
             echo implode('<br>', $status['folders_errors']);
         }
@@ -684,426 +677,4 @@ protected function fixFilenameCasing()
             }
         }
     }
-
-    /**
-     * Fix filesystem permissions when updating a new 5.2.0 installation.
-     *
-     * @return  void
-     *
-     * @since   5.2.2
-     *
-     * @todo    6.0 Remove this method
-     *
-     * @deprecated  5.2.2 will be removed in 6.0 without replacement
-     */
-    protected function fixFilesystemPermissions()
-    {
-        // Don't do anything if not updating from a 5.2.0 or 5.2.1
-        if (
-            empty($this->fromVersion)
-            || version_compare($this->fromVersion, '5.2.0', 'lt')
-            || version_compare($this->fromVersion, '5.2.1', 'gt')
-        ) {
-            return;
-        }
-
-        // First check tmp folder if it has mode 777
-        if (decoct(fileperms(JPATH_ROOT . '/tmp') & 0777) === '777') {
-            // We are either on Windows where folders always have 777, or we have to fix permissions
-            @chmod(JPATH_ROOT . '/tmp', 0755);
-            clearstatcache(true, JPATH_ROOT . '/tmp');
-        }
-
-        // Check tmp folder again if it still has mode 777
-        if (decoct(fileperms(JPATH_ROOT . '/tmp') & 0777) === '777') {
-            // We are on Windows or chmod has no effect
-            return;
-        }
-
-        try {
-            // Using hard-coded string because a new language string would not be available in all cases
-            Log::add('Fixing permissions for files and folders.', Log::INFO, 'Update');
-        } catch (\RuntimeException $exception) {
-            // Informational log only
-        }
-
-        $files = [
-            '/htaccess.txt',
-            '/index.php',
-            '/libraries/.htaccess',
-            '/libraries/vendor/jfcherng/php-diff/.phpstorm.meta.php',
-            '/libraries/vendor/joomla/http/.drone.jsonnet',
-            '/libraries/vendor/joomla/http/.drone.yml',
-            '/libraries/vendor/joomla/oauth1/.drone.jsonnet',
-            '/libraries/vendor/joomla/oauth1/.drone.yml',
-            '/libraries/vendor/joomla/oauth2/.drone.jsonnet',
-            '/libraries/vendor/joomla/oauth2/.drone.yml',
-            '/libraries/vendor/joomla/router/.drone.jsonnet',
-            '/libraries/vendor/joomla/router/.drone.yml',
-            '/libraries/vendor/joomla/string/.drone.jsonnet',
-            '/libraries/vendor/joomla/string/.drone.yml',
-            '/libraries/vendor/joomla/uri/.drone.jsonnet',
-            '/libraries/vendor/joomla/uri/.drone.yml',
-            '/libraries/vendor/joomla/utilities/.drone.jsonnet',
-            '/libraries/vendor/joomla/utilities/.drone.yml',
-            '/LICENSE.txt',
-            '/README.txt',
-            '/robots.txt',
-            '/robots.txt.dist',
-            '/tmp/index.html',
-            '/web.config.txt',
-        ];
-
-        $folders = [
-            '/administrator',
-            '/administrator/cache',
-            '/administrator/components',
-            '/administrator/help',
-            '/administrator/help/en-GB',
-            '/administrator/includes',
-            '/administrator/language',
-            '/administrator/language/en-GB',
-            '/administrator/language/overrides',
-            '/administrator/logs',
-            '/administrator/manifests',
-            '/administrator/manifests/files',
-            '/administrator/manifests/libraries',
-            '/administrator/manifests/packages',
-            '/administrator/modules',
-            '/administrator/templates',
-            '/api',
-            '/api/components',
-            '/api/includes',
-            '/api/language',
-            '/api/language/en-GB',
-            '/cache',
-            '/cli',
-            '/components',
-            '/images',
-            '/images/banners',
-            '/images/headers',
-            '/images/sampledata',
-            '/images/sampledata/cassiopeia',
-            '/includes',
-            '/language',
-            '/language/en-GB',
-            '/language/overrides',
-            '/layouts',
-            '/layouts/chromes',
-            '/layouts/libraries',
-            '/layouts/libraries/html',
-            '/layouts/libraries/html/bootstrap',
-            '/layouts/libraries/html/bootstrap/modal',
-            '/layouts/libraries/html/bootstrap/tab',
-            '/libraries',
-            '/libraries/php-encryption',
-            '/libraries/phpass',
-            '/media',
-            '/media/cache',
-            '/media/templates',
-            '/media/templates/administrator',
-            '/media/templates/site',
-            '/media/vendor',
-            '/modules',
-            '/plugins',
-            '/templates',
-        ];
-
-        $foldersRecursive = [
-            '/administrator/components/com_actionlogs',
-            '/administrator/components/com_admin',
-            '/administrator/components/com_ajax',
-            '/administrator/components/com_associations',
-            '/administrator/components/com_banners',
-            '/administrator/components/com_cache',
-            '/administrator/components/com_categories',
-            '/administrator/components/com_checkin',
-            '/administrator/components/com_config',
-            '/administrator/components/com_contact',
-            '/administrator/components/com_content',
-            '/administrator/components/com_contenthistory',
-            '/administrator/components/com_cpanel',
-            '/administrator/components/com_fields',
-            '/administrator/components/com_finder',
-            '/administrator/components/com_guidedtours',
-            '/administrator/components/com_installer',
-            '/administrator/components/com_joomlaupdate',
-            '/administrator/components/com_languages',
-            '/administrator/components/com_login',
-            '/administrator/components/com_mails',
-            '/administrator/components/com_media',
-            '/administrator/components/com_menus',
-            '/administrator/components/com_messages',
-            '/administrator/components/com_modules',
-            '/administrator/components/com_newsfeeds',
-            '/administrator/components/com_plugins',
-            '/administrator/components/com_postinstall',
-            '/administrator/components/com_privacy',
-            '/administrator/components/com_redirect',
-            '/administrator/components/com_scheduler',
-            '/administrator/components/com_tags',
-            '/administrator/components/com_templates',
-            '/administrator/components/com_users',
-            '/administrator/components/com_workflow',
-            '/administrator/components/com_wrapper',
-            '/administrator/modules/mod_custom',
-            '/administrator/modules/mod_feed',
-            '/administrator/modules/mod_frontend',
-            '/administrator/modules/mod_guidedtours',
-            '/administrator/modules/mod_latest',
-            '/administrator/modules/mod_latestactions',
-            '/administrator/modules/mod_logged',
-            '/administrator/modules/mod_login',
-            '/administrator/modules/mod_loginsupport',
-            '/administrator/modules/mod_menu',
-            '/administrator/modules/mod_messages',
-            '/administrator/modules/mod_multilangstatus',
-            '/administrator/modules/mod_popular',
-            '/administrator/modules/mod_post_installation_messages',
-            '/administrator/modules/mod_privacy_dashboard',
-            '/administrator/modules/mod_privacy_status',
-            '/administrator/modules/mod_quickicon',
-            '/administrator/modules/mod_sampledata',
-            '/administrator/modules/mod_stats_admin',
-            '/administrator/modules/mod_submenu',
-            '/administrator/modules/mod_title',
-            '/administrator/modules/mod_toolbar',
-            '/administrator/modules/mod_user',
-            '/administrator/modules/mod_version',
-            '/administrator/templates/atum',
-            '/administrator/templates/system',
-            '/api/components/com_banners',
-            '/api/components/com_categories',
-            '/api/components/com_config',
-            '/api/components/com_contact',
-            '/api/components/com_content',
-            '/api/components/com_contenthistory',
-            '/api/components/com_fields',
-            '/api/components/com_installer',
-            '/api/components/com_languages',
-            '/api/components/com_media',
-            '/api/components/com_menus',
-            '/api/components/com_messages',
-            '/api/components/com_modules',
-            '/api/components/com_newsfeeds',
-            '/api/components/com_plugins',
-            '/api/components/com_privacy',
-            '/api/components/com_redirect',
-            '/api/components/com_tags',
-            '/api/components/com_templates',
-            '/api/components/com_users',
-            '/components/com_ajax',
-            '/components/com_banners',
-            '/components/com_config',
-            '/components/com_contact',
-            '/components/com_content',
-            '/components/com_contenthistory',
-            '/components/com_fields',
-            '/components/com_finder',
-            '/components/com_media',
-            '/components/com_menus',
-            '/components/com_modules',
-            '/components/com_newsfeeds',
-            '/components/com_privacy',
-            '/components/com_tags',
-            '/components/com_users',
-            '/components/com_wrapper',
-            '/layouts/joomla',
-            '/layouts/plugins',
-            '/libraries/src',
-            '/libraries/vendor',
-            '/media/com_actionlogs',
-            '/media/com_admin',
-            '/media/com_associations',
-            '/media/com_banners',
-            '/media/com_cache',
-            '/media/com_categories',
-            '/media/com_config',
-            '/media/com_contact',
-            '/media/com_content',
-            '/media/com_contenthistory',
-            '/media/com_cpanel',
-            '/media/com_fields',
-            '/media/com_finder',
-            '/media/com_guidedtours',
-            '/media/com_installer',
-            '/media/com_joomlaupdate',
-            '/media/com_languages',
-            '/media/com_mails',
-            '/media/com_media',
-            '/media/com_menus',
-            '/media/com_modules',
-            '/media/com_scheduler',
-            '/media/com_tags',
-            '/media/com_templates',
-            '/media/com_users',
-            '/media/com_workflow',
-            '/media/com_wrapper',
-            '/media/layouts',
-            '/media/legacy',
-            '/media/mailto',
-            '/media/mod_articles',
-            '/media/mod_articles_news',
-            '/media/mod_languages',
-            '/media/mod_login',
-            '/media/mod_menu',
-            '/media/mod_quickicon',
-            '/media/mod_sampledata',
-            '/media/plg_behaviour_compat',
-            '/media/plg_captcha_recaptcha',
-            '/media/plg_captcha_recaptcha_invisible',
-            '/media/plg_content_vote',
-            '/media/plg_editors-xtd_image',
-            '/media/plg_editors_codemirror',
-            '/media/plg_editors_none',
-            '/media/plg_editors_tinymce',
-            '/media/plg_installer_folderinstaller',
-            '/media/plg_installer_packageinstaller',
-            '/media/plg_installer_urlinstaller',
-            '/media/plg_installer_webinstaller',
-            '/media/plg_media-action_crop',
-            '/media/plg_media-action_resize',
-            '/media/plg_media-action_rotate',
-            '/media/plg_multifactorauth_email',
-            '/media/plg_multifactorauth_fixed',
-            '/media/plg_multifactorauth_totp',
-            '/media/plg_multifactorauth_webauthn',
-            '/media/plg_multifactorauth_yubikey',
-            '/media/plg_quickicon_eos',
-            '/media/plg_quickicon_extensionupdate',
-            '/media/plg_quickicon_joomlaupdate',
-            '/media/plg_quickicon_overridecheck',
-            '/media/plg_quickicon_privacycheck',
-            '/media/plg_system_debug',
-            '/media/plg_system_guidedtours',
-            '/media/plg_system_jooa11y',
-            '/media/plg_system_schedulerunner',
-            '/media/plg_system_shortcut',
-            '/media/plg_system_stats',
-            '/media/plg_system_webauthn',
-            '/media/plg_user_token',
-            '/media/system',
-            '/media/templates/administrator/atum',
-            '/media/templates/site/cassiopeia',
-            '/media/vendor/accessibility',
-            '/media/vendor/awesomplete',
-            '/media/vendor/bootstrap',
-            '/media/vendor/choicesjs',
-            '/media/vendor/chosen',
-            '/media/vendor/codemirror',
-            '/media/vendor/cropperjs',
-            '/media/vendor/debugbar',
-            '/media/vendor/diff',
-            '/media/vendor/dragula',
-            '/media/vendor/es-module-shims',
-            '/media/vendor/focus-visible',
-            '/media/vendor/fontawesome-free',
-            '/media/vendor/hotkeysjs',
-            '/media/vendor/joomla-custom-elements',
-            '/media/vendor/jquery',
-            '/media/vendor/jquery-migrate',
-            '/media/vendor/mediaelement',
-            '/media/vendor/metismenujs',
-            '/media/vendor/minicolors',
-            '/media/vendor/qrcode',
-            '/media/vendor/roboto-fontface',
-            '/media/vendor/sa11y',
-            '/media/vendor/shepherdjs',
-            '/media/vendor/short-and-sweet',
-            '/media/vendor/skipto',
-            '/media/vendor/tinymce',
-            '/media/vendor/webcomponentsjs',
-            '/modules/mod_articles',
-            '/modules/mod_articles_archive',
-            '/modules/mod_articles_categories',
-            '/modules/mod_articles_category',
-            '/modules/mod_articles_latest',
-            '/modules/mod_articles_news',
-            '/modules/mod_articles_popular',
-            '/modules/mod_banners',
-            '/modules/mod_breadcrumbs',
-            '/modules/mod_custom',
-            '/modules/mod_feed',
-            '/modules/mod_finder',
-            '/modules/mod_footer',
-            '/modules/mod_languages',
-            '/modules/mod_login',
-            '/modules/mod_menu',
-            '/modules/mod_random_image',
-            '/modules/mod_related_items',
-            '/modules/mod_stats',
-            '/modules/mod_syndicate',
-            '/modules/mod_tags_popular',
-            '/modules/mod_tags_similar',
-            '/modules/mod_users_latest',
-            '/modules/mod_whosonline',
-            '/modules/mod_wrapper',
-            '/plugins/actionlog',
-            '/plugins/api-authentication',
-            '/plugins/authentication',
-            '/plugins/behaviour',
-            '/plugins/captcha',
-            '/plugins/content',
-            '/plugins/editors',
-            '/plugins/editors-xtd',
-            '/plugins/extension',
-            '/plugins/fields',
-            '/plugins/filesystem',
-            '/plugins/finder',
-            '/plugins/installer',
-            '/plugins/media-action',
-            '/plugins/multifactorauth',
-            '/plugins/privacy',
-            '/plugins/quickicon',
-            '/plugins/sampledata',
-            '/plugins/schemaorg',
-            '/plugins/system',
-            '/plugins/task',
-            '/plugins/user',
-            '/plugins/webservices',
-            '/plugins/workflow',
-            '/templates/cassiopeia',
-            '/templates/system',
-        ];
-
-        foreach ($files as $file) {
-            if (is_file(JPATH_ROOT . $file) && decoct(fileperms(JPATH_ROOT . $file) & 0777) === '777') {
-                @chmod(JPATH_ROOT . $file, 0644);
-            }
-        }
-
-        foreach ($folders as $folder) {
-            if (is_dir(JPATH_ROOT . $folder)) {
-                if (decoct(fileperms(JPATH_ROOT . $folder) & 0777) === '777') {
-                    @chmod(JPATH_ROOT . $folder, 0755);
-                }
-
-                foreach (Folder::files(JPATH_ROOT . $folder, '.', false, true) as $file) {
-                    if (decoct(fileperms($file) & 0777) === '777') {
-                        @chmod($file, 0644);
-                    }
-                }
-            }
-        }
-
-        foreach ($foldersRecursive as $parentFolder) {
-            if (is_dir(JPATH_ROOT . $parentFolder)) {
-                if (decoct(fileperms(JPATH_ROOT . $parentFolder) & 0777) === '777') {
-                    @chmod(JPATH_ROOT . $parentFolder, 0755);
-                }
-
-                foreach (Folder::folders(JPATH_ROOT . $parentFolder, '.', true, true) as $folder) {
-                    if (decoct(fileperms($folder) & 0777) === '777') {
-                        @chmod($folder, 0755);
-                    }
-                }
-
-                foreach (Folder::files(JPATH_ROOT . $parentFolder, '.', true, true) as $file) {
-                    if (decoct(fileperms($file) & 0777) === '777') {
-                        @chmod($file, 0644);
-                    }
-                }
-            }
-        }
-    }
 }