diff --git a/readme.txt b/readme.txt
index e540506..22959a9 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,9 +2,9 @@
 Contributors: wildworks
 Tags: gutenberg,rich text,highlighter,formatting
 Donate link: https://www.paypal.me/thamanoJP
-Requires at least: 6.0
-Tested up to: 6.3
-Stable tag: 2.3.0
+Requires at least: 6.2
+Tested up to: 6.4
+Stable tag: 2.4.0
 Requires PHP: 7.4
 License: GPLv2 or later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
@@ -46,6 +46,10 @@ Removes all formatting.
 
 == Changelog ==
 
+= 2.4.0 =
+* Tested to WordPress 6.4
+* Drop support for WordPress 6.0, 6.1
+
 = 2.3.0 =
 * Tested to WordPress 6.3
 * Add: striped style
diff --git a/richtext-extension.php b/richtext-extension.php
index cdd170b..551527c 100644
--- a/richtext-extension.php
+++ b/richtext-extension.php
@@ -2,7 +2,9 @@
 /**
  * Plugin Name: RichText Extension
  * Description: Adds useful decoration features to the Gutenberg RichText editor toolbar.
- * Version: 2.3.0
+ * Requires at least: 6.2
+ * Requires PHP: 7.4
+ * Version: 2.4.0
  * Author: Aki Hamano
  * Author URI: https://github.com/t-hamano
  * License: GPL2 or later