diff --git a/readme.txt b/readme.txt
index 4cec1044..7adf2295 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,8 +1,8 @@
 === Lightning ===
 Lightning WordPress theme, Copyright (C) 2015-2024 Vektor,Inc.
 Lightning WordPress theme is licensed under the GPL.
-Tested up to: 6.5
-Stable tag: 15.25.1
+Tested up to: 6.6
+Stable tag: 15.26.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -37,8 +37,9 @@ https://www.vektor-inc.co.jp/inquiry/
 
 == Changelog ==
 
+v15.26.0
 [ G3 / G2 ][ Design Bug Fix ] Fix outline background of button style in WP6.6.
-[ G3 ][ Editor Design Bug Fix ] Add editor width setting for WP6.6.
+[ G3 ][ Specification Change ] Refactoring the width handling of the edit screen
 [ G3 / G2 ][ Editor Design Bug Fix ] Supports wide slider item width.
 
 v15.25.1
diff --git a/style.css b/style.css
index 8d12154a..890bab89 100644
--- a/style.css
+++ b/style.css
@@ -5,9 +5,9 @@ Theme URI: https://lightning.vektor-inc.co.jp/en/
 Description: Lightning is a very simple & easy to customize theme which is based on the Bootstrap. It is also very friendly with custom post types and custom taxonomies. When you add a new one, the breadcrumbs will be adjusted and posts will look beautifully without editing or adding a template files.
 Author: Vektor,Inc.
 Author URI: https://www.vektor-inc.co.jp
-Version: 15.25.1
+Version: 15.26.0
 Requires at least: 5.9
-Tested up to: 6.5
+Tested up to: 6.6
 Requires PHP: 7.4
 Tags: blog, one-column, custom-background, custom-colors, custom-logo, custom-menu, editor-style, featured-images, footer-widgets, full-width-template, sticky-post, theme-options, threaded-comments, translation-ready, block-styles, wide-blocks
 License: GNU General Public License v2 or later