diff --git a/.wordpress-org/icon.svg b/.wordpress-org/icon.svg
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,11 @@
+##### [Version 2.6.9](https://github.com/Codeinwp/wp-maintenance-mode/compare/v2.6.8...v2.6.9) (2023-12-22)
+
+### Bug Fixes
+- Fixed compatibility issue with WP 6.4
+- Fixed broken templates layout issue on the Safari browser
+- Enhanced security
+- Fixed compatibility issue with WP-Optimize
+
 ##### [Version 2.6.8](https://github.com/Codeinwp/wp-maintenance-mode/compare/v2.6.7...v2.6.8) (2023-06-07)
 
 - Fix the Save button Module tab not working

diff --git a/README.md b/README.md
@@ -6,9 +6,9 @@
 **Author:** Themeisle  
 **Author URI:** https://themeisle.com/  
 **Tags:** maintenance mode, admin, administration, unavailable, coming soon, multisite, landing page, under construction, contact form, subscribe, countdown  
-**Requires at least:** 3.5  
-**Tested up to:** 6.2  
-**Stable tag:** 2.6.8  
+**Requires at least:** 4.7  
+**Tested up to:** 6.4  
+**Stable tag:** 2.6.9  
 **Requires PHP:** 5.6  
 **License:** GPL-2.0+  
 
@@ -93,6 +93,17 @@ Notice: `wp-cron.php` is excluded by default.
 
 ## Changelog ##
 
+##### [Version 2.6.9](https://github.com/Codeinwp/wp-maintenance-mode/compare/v2.6.8...v2.6.9) (2023-12-22)
+
+### Bug Fixes
+- Fixed compatibility issue with WP 6.4
+- Fixed broken templates layout issue on the Safari browser
+- Enhanced security
+- Fixed compatibility issue with WP-Optimize
+
+
+
+
 ##### [Version 2.6.8](https://github.com/Codeinwp/wp-maintenance-mode/compare/v2.6.7...v2.6.8) (2023-06-07)
 
 - Fix the Save button Module tab not working

diff --git a/assets/css/style-admin.css b/assets/css/style-admin.css
@@ -177,6 +177,7 @@ label.wpmm-templates-gallery__label {
 .wpmm-template-wrap {
     width: calc( 100% / 3 - 20px);
     max-width: 290px;
+    height: 100%;
 }
 
 .wpmm-template-image-wrap {

diff --git a/composer.json b/composer.json
@@ -2,7 +2,7 @@
     "name": "codeinwp/wp-maintenance-mode",
     "description": "Adds a splash page to your site that lets visitors know your site is down for maintenance. Full access to the back- & front-end is optional.",
     "type": "wordpress-plugin",
-    "version": "2.6.8",
+    "version": "2.6.9",
     "license": "GPL-2.0+",
     "homepage": "https://themeisle.com",
     "support": {

diff --git a/composer.lock b/composer.lock
diff --git a/includes/classes/wp-maintenance-mode-admin.php b/includes/classes/wp-maintenance-mode-admin.php
@@ -689,8 +689,13 @@ public function insert_template() {
 				die( esc_html__( 'The nonce field must not be empty.', 'wp-maintenance-mode' ) );
 			}
 
+			// sanitize source only allow specific sources for further nonce verification.
+			$source = isset( $_POST['source'] ) && in_array( $_POST['source'], array( 'wizard', 'tab-design' ), true ) ? $_POST['source'] : '';
+			if ( empty( $source ) ) {
+				die( esc_html__( 'The source must not be empty.', 'wp-maintenance-mode' ) );
+			}
 			// check nonce validation
-			if ( ! wp_verify_nonce( $_POST['_wpnonce'], $_POST['source'] ) ) {
+			if ( ! wp_verify_nonce( $_POST['_wpnonce'], $source ) ) {
 				die( esc_html__( 'Security check.', 'wp-maintenance-mode' ) );
 			}
 

diff --git a/includes/classes/wp-maintenance-mode.php b/includes/classes/wp-maintenance-mode.php
@@ -8,7 +8,7 @@
 
 	class WP_Maintenance_Mode {
 
-		const VERSION = '2.6.8';
+		const VERSION = '2.6.9';
 
 		const MAINTENANCE  = 'maintenance';
 		const COMING_SOON  = 'coming-soon';
@@ -98,6 +98,10 @@ private function __construct() {
 				add_action( 'otter_form_after_submit', array( $this, 'otter_add_subscriber' ) );
 
 				if ( isset( $this->plugin_settings['design']['page_id'] ) && get_option( 'wpmm_new_look' ) && get_post_status( $this->plugin_settings['design']['page_id'] ) === 'private' ) {
+					add_filter( 'wpo_purge_all_cache_on_update', '__return_true' );
+					if ( function_exists( 'wp_functionality_constants' ) ) {
+						wp_functionality_constants();
+					}
 					wp_publish_post( $this->plugin_settings['design']['page_id'] );
 				}
 

diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wp-maintenance-mode",
-  "version": "2.6.8",
+  "version": "2.6.9",
   "author": "Themeisle",
   "homepage": "https://themeisle.com/",
   "license": "GPL-3.0+",

diff --git a/readme.txt b/readme.txt
@@ -6,9 +6,9 @@ Plugin URI: https://themeisle.com/
 Author: Themeisle
 Author URI: https://themeisle.com/
 Tags: maintenance mode, admin, administration, unavailable, coming soon, multisite, landing page, under construction, contact form, subscribe, countdown
-Requires at least: 3.5
-Tested up to: 6.2
-Stable tag: 2.6.8
+Requires at least: 4.7
+Tested up to: 6.4
+Stable tag: 2.6.9
 Requires PHP: 5.6
 License: GPL-2.0+
 
@@ -93,6 +93,17 @@ Notice: `wp-cron.php` is excluded by default.
 
 == Changelog ==
 
+##### [Version 2.6.9](https://github.com/Codeinwp/wp-maintenance-mode/compare/v2.6.8...v2.6.9) (2023-12-22)
+
+### Bug Fixes
+- Fixed compatibility issue with WP 6.4
+- Fixed broken templates layout issue on the Safari browser
+- Enhanced security
+- Fixed compatibility issue with WP-Optimize
+
+
+
+
 ##### [Version 2.6.8](https://github.com/Codeinwp/wp-maintenance-mode/compare/v2.6.7...v2.6.8) (2023-06-07)
 
 - Fix the Save button Module tab not working

diff --git a/wp-maintenance-mode.php b/wp-maintenance-mode.php
@@ -4,7 +4,7 @@
  *
  * Plugin Name: LightStart - Maintenance Mode, Coming Soon and Landing Page Builder
  * Description: Adds a splash page to your site that lets visitors know your site is down for maintenance. It's perfect for a coming soon or landing page.
- * Version: 2.6.8
+ * Version: 2.6.9
  * Author: Themeisle
  * Author URI: https://themeisle.com/
  * Twitter: themeisle