diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad421c7..9ccba34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+entryPhotoExifWidget 1.5 - 2023.10.14
+===========================================================
+* Require Dotclear 2.28
+* Require PHP 8.1
+* Upgrade to Dotclear 2.28
+
 entryPhotoExifWidget 1.4 - 2023.08.12
 ===========================================================
 * Require Dotclear 2.27
diff --git a/README.md b/README.md
index 3e1ba1e..e62b797 100644
--- a/README.md
+++ b/README.md
@@ -1,25 +1,22 @@
 # README
 
-[![Release](https://img.shields.io/badge/release-1.4-a2cbe9.svg)](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases)
-[![Date](https://img.shields.io/badge/date-2023.08.12-c44d58.svg)](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases)
-[![Dotclear](https://img.shields.io/badge/dotclear-v2.27-137bbb.svg)](https://fr.dotclear.org/download)
+[![Release](https://img.shields.io/badge/release-1.5-a2cbe9.svg)](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases)
+![Date](https://img.shields.io/badge/date-2023.10.14-c44d58.svg)
+[![Dotclear](https://img.shields.io/badge/dotclear-v2.28-137bbb.svg)](https://fr.dotclear.org/download)
 [![Dotaddict](https://img.shields.io/badge/dotaddict-official-9ac123.svg)](https://plugins.dotaddict.org/dc2/details/entryPhotoExifWidget)
 [![License](https://img.shields.io/github/license/JcDenis/entryPhotoExifWidget)](https://git.dotclear.watch/JcDenis/arlequin/blob/master/LICENSE)
 
-## WHAT IS ENRTYPHOTOEXIFWIDGET ?
+## ABOUT
 
-_entryPhotoExifWidget_ **Entry Photo Exif Widget** is a plugin for the open-source 
-web publishing software called Dotclear.
+_entryPhotoExifWidget_ is a plugin for the open-source web publishing software called [Dotclear](https://www.dotclear.org).
 
-Show images exif of an entry in a widget.
+> Show images exif of an entry in a widget.
 
 ## REQUIREMENTS
 
-_entryPhotoExifWidget_ requires: 
-
+* Dotclear 2.28
+* PHP 8.1+
 * permissions to manage widgets
-* Dotclear 2.27
-* PHP 7.4+
 
 ## USAGE
 
@@ -30,13 +27,14 @@ Add and configure _Photo Exif Widget_ from widgets manager.
 
 ## LINKS
 
-* License : [GNU GPL v2](https://www.gnu.org/licenses/old-licenses/lgpl-2.0.html)
-* Source & contribution : [Gitea Page](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget) or [GitHub Page](https://github.com/JcDenis/entryPhotoExifWidget)
-* Packages & details: [Gitea Page](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases) or [Dotaddict Page](https://plugins.dotaddict.org/dc2/details/entryPhotoExifWidget)
-* Discuss and help : [Dotclear Forum](https://forum.dotclear.org/viewtopic.php?id=48992)
+* [License](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/src/branch/master/LICENSE)
+* [Packages & details](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases) (or on [Dotaddict](https://plugins.dotaddict.org/dc2/details/entryPhotoExifWidget))
+* [Sources & contributions](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget) (or on [GitHub](https://github.com/JcDenis/entryPhotoExifWidget))
+* [Issues & security](https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/issues) (or on [GitHub](https://github.com/JcDenis/entryPhotoExifWidget/issues))
+* [Discuss and help](https://forum.dotclear.org/viewtopic.php?id=48992)
 
 ## CONTRIBUTORS
 
-* Jean-Christian Denis
+* Jean-Christian Denis (author)
 
 You are welcome to contribute to this code.
diff --git a/_define.php b/_define.php
index eefd575..187569d 100644
--- a/_define.php
+++ b/_define.php
@@ -1,29 +1,26 @@
 <?php
 /**
- * @brief entryPhotoExifWidget, a plugin for Dotclear 2
+ * @file
+ * @brief       The plugin entryPhotoExifWidget definition
+ * @ingroup     entryPhotoExifWidget
  *
- * @package Dotclear
- * @subpackage Plugin
+ * @defgroup    entryPhotoExifWidget Plugin entryPhotoExifWidget.
  *
- * @author Jean-Christian Denis and contibutors
+ * Show images EXIF of an entry.
  *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
  */
-if (!defined('DC_RC_PATH')) {
-    return null;
-}
+declare(strict_types=1);
 
 $this->registerModule(
     'Entry Photo EXIF Widget',
     'Show images EXIF of an entry',
     'Jean-Christian Denis and contibutors',
-    '1.4',
+    '1.5',
     [
-        'requires'    => [['core', '2.27']],
-        'permissions' => dcCore::app()->auth->makePermissions([
-            dcAuth::PERMISSION_ADMIN,
-        ]),
+        'requires'    => [['core', '2.28']],
+        'permissions' => 'My',
         'type'       => 'plugin',
         'support'    => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/issues',
         'details'    => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/src/branch/master/README.md',
diff --git a/dcstore.xml b/dcstore.xml
index 9d6bc5c..38549c7 100644
--- a/dcstore.xml
+++ b/dcstore.xml
@@ -2,11 +2,11 @@
 <modules xmlns:da="http://dotaddict.org/da/">
   <module id="entryPhotoExifWidget">
     <name>Entry Photo EXIF Widget</name>
-    <version>1.4</version>
+    <version>1.5</version>
     <author>Jean-Christian Denis and contibutors</author>
     <desc>Show images EXIF of an entry</desc>
-    <file>https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases/download/v1.4/plugin-entryPhotoExifWidget.zip</file>
-    <da:dcmin>2.27</da:dcmin>
+    <file>https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/releases/download/v1.5/plugin-entryPhotoExifWidget.zip</file>
+    <da:dcmin>2.28</da:dcmin>
     <da:details>https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/src/branch/master/README.md</da:details>
     <da:support>https://git.dotclear.watch/JcDenis/entryPhotoExifWidget/issues</da:support>
   </module>
diff --git a/src/Backend.php b/src/Backend.php
index cc88a8d..a08294c 100644
--- a/src/Backend.php
+++ b/src/Backend.php
@@ -1,22 +1,19 @@
 <?php
-/**
- * @brief entryPhotoExifWidget, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and contibutors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\entryPhotoExifWidget;
 
-use dcCore;
+use Dotclear\App;
 use Dotclear\Core\Process;
 
+/**
+ * @brief   entryPhotoExifWidget backend class.
+ * @ingroup entryPhotoExifWidget
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Backend extends Process
 {
     public static function init(): bool
@@ -30,7 +27,7 @@ class Backend extends Process
             return false;
         }
 
-        dcCore::app()->addBehavior('initWidgets', [Widgets::class, 'initWidgets']);
+        App::behavior()->addBehavior('initWidgets', Widgets::initWidgets(...));
 
         return true;
     }
diff --git a/src/Frontend.php b/src/Frontend.php
index 519c38d..3903252 100644
--- a/src/Frontend.php
+++ b/src/Frontend.php
@@ -1,22 +1,19 @@
 <?php
-/**
- * @brief entryPhotoExifWidget, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and contibutors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\entryPhotoExifWidget;
 
-use dcCore;
+use Dotclear\App;
 use Dotclear\Core\Process;
 
+/**
+ * @brief   entryPhotoExifWidget frontend class.
+ * @ingroup entryPhotoExifWidget
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Frontend extends Process
 {
     public static function init(): bool
@@ -30,7 +27,7 @@ class Frontend extends Process
             return false;
         }
 
-        dcCore::app()->addBehavior('initWidgets', [Widgets::class, 'initWidgets']);
+        App::behavior()->addBehavior('initWidgets', Widgets::initWidgets(...));
 
         return true;
     }
diff --git a/src/My.php b/src/My.php
index 3de5979..7948d4a 100644
--- a/src/My.php
+++ b/src/My.php
@@ -1,21 +1,19 @@
 <?php
-/**
- * @brief entryPhotoExifWidget, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and contibutors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\entryPhotoExifWidget;
 
 use Dotclear\Module\MyPlugin;
 
+/**
+ * @brief   entryPhotoExifWidget My helper.
+ * @ingroup entryPhotoExifWidget
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class My extends MyPlugin
 {
+    // Use default permissions
 }
diff --git a/src/Widgets.php b/src/Widgets.php
index 592a290..c65a1e4 100644
--- a/src/Widgets.php
+++ b/src/Widgets.php
@@ -1,20 +1,10 @@
 <?php
-/**
- * @brief entryPhotoExifWidget, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and contibutors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\entryPhotoExifWidget;
 
-use dcCore;
+use Dotclear\App;
 use Dotclear\Helper\Date;
 use Dotclear\Helper\File\Image\ImageMeta;
 use Dotclear\Helper\File\Path;
@@ -22,6 +12,13 @@ use Dotclear\Helper\Html\Html;
 use Dotclear\Plugin\widgets\WidgetsElement;
 use Dotclear\Plugin\widgets\WidgetsStack;
 
+/**
+ * @brief   entryPhotoExifWidget widgets class.
+ * @ingroup entryPhotoExifWidget
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Widgets
 {
     public static array $supported_post_type = ['post', 'page', 'gal', 'galitem'];
@@ -31,12 +28,12 @@ class Widgets
 
     public static function initWidgets(WidgetsStack $w): void
     {
-        if (is_null(dcCore::app()->blog)) {
+        if (!App::blog()->isDefined()) {
             return;
         }
 
         $categories_combo = ['-' => '', __('Uncategorized') => 'null'];
-        $categories       = dcCore::app()->blog->getCategories();
+        $categories       = App::blog()->getCategories();
         while ($categories->fetch()) {
             $categories_combo[Html::escapeHTML($categories->f('cat_title'))] = $categories->f('cat_id');
         }
@@ -52,7 +49,7 @@ class Widgets
         $w->create(
             'epew',
             __('Entry Photo EXIF'),
-            [Widgets::class, 'renderWidget'],
+            self::renderWidget(...),
             null,
             __('Show images exif of an entry')
         )
@@ -169,33 +166,30 @@ class Widgets
     public static function renderWidget(WidgetsElement $w): string
     {
         // Widget is offline
-        if ($w->offline) {
+        if ($w->offline || !App::blog()->isDefined()) {
             return '';
         }
 
-        // nullsafe
-        if (is_null(dcCore::app()->blog) || is_null(dcCore::app()->ctx)) {
-            return '';
-        }
+        $ctx = App::frontend()->context();
 
         // Not in post context
-        if (!dcCore::app()->ctx->exists('posts') || !dcCore::app()->ctx->__get('posts')->f('post_id')) {
+        if (!$ctx->exists('posts') || !$ctx->__get('posts')->f('post_id')) {
             return '';
         }
 
         // Not supported post type
-        if (!in_array(dcCore::app()->ctx->__get('posts')->f('post_type'), self::$supported_post_type)) {
+        if (!in_array($ctx->__get('posts')->f('post_type'), self::$supported_post_type)) {
             return '';
         }
 
         // Category limit
-        if ($w->category == 'null' && dcCore::app()->ctx->__get('posts')->f('cat_id') !== null
-         || $w->category != 'null' && $w->category != '' && $w->category != dcCore::app()->ctx->__get('posts')->f('cat_id')) {
+        if ($w->category == 'null' && $ctx->__get('posts')->f('cat_id') !== null
+         || $w->category != 'null' && $w->category != '' && $w->category != $ctx->__get('posts')->f('cat_id')) {
             return '';
         }
 
         # Content lookup
-        $text = dcCore::app()->ctx->__get('posts')->f('post_excerpt_xhtml') . dcCore::app()->ctx->__get('posts')->f('post_content_xhtml');
+        $text = $ctx->__get('posts')->f('post_excerpt_xhtml') . $ctx->__get('posts')->f('post_content_xhtml');
 
         # Find source images
         $images = self::getImageSource($text, $w->thumbsize);
@@ -246,14 +240,14 @@ class Widgets
 
     public static function getImageSource(string $subject, string $size = ''): array
     {
-        if (is_null(dcCore::app()->blog)) {
+        if (!App::blog()->isDefined()) {
             return [];
         }
 
         # Path and url
-        $p_url  = (string) dcCore::app()->blog->settings->get('system')->get('public_url');
-        $p_site = (string) preg_replace('#^(.+?//.+?)/(.*)$#', '$1', dcCore::app()->blog->url);
-        $p_root = dcCore::app()->blog->public_path;
+        $p_url  = (string) App::blog()->settings()->get('system')->get('public_url');
+        $p_site = (string) preg_replace('#^(.+?//.+?)/(.*)$#', '$1', App::blog()->url());
+        $p_root = App::blog()->publicPath();
 
         # Image pattern
         $pattern = '(?:' . preg_quote($p_site, '/') . ')?' . preg_quote($p_url, '/');
@@ -324,7 +318,7 @@ class Widgets
 
     public static function getImageMeta(?string $src): array
     {
-        if (is_null(dcCore::app()->blog)) {
+        if (!App::blog()->isDefined()) {
             return [];
         }
 
@@ -399,8 +393,8 @@ class Widgets
 
         # DateTimeOriginal
         if (!empty($m['DateTimeOriginal'])) {
-            $dt_ft                        = dcCore::app()->blog->settings->get('system')->get('date_format') . ', ' . dcCore::app()->blog->settings->get('system')->get('time_format');
-            $dt_tz                        = dcCore::app()->blog->settings->get('system')->get('blog_timezone');
+            $dt_ft                        = App::blog()->settings()->get('system')->get('date_format') . ', ' . App::blog()->settings()->get('system')->get('time_format');
+            $dt_tz                        = App::blog()->settings()->get('system')->get('blog_timezone');
             $metas['DateTimeOriginal'][1] = Date::dt2str($dt_ft, $m['DateTimeOriginal'], $dt_tz);
         }