I found better solution

Hi,

I found better solution for solve this problem without plugin.

Backup your wp-includes/pluggable.php
Edit wp-includes/pluggable.php file
Find wp_password_change_notification part
Delete these lines from file:

if ( !function_exists('wp_password_change_notification') ) :
/**
 * Notify the blog admin of a user changing password, normally via email.
 *
 * @since 2.7.0
 *
 * @param object $user User Object
 */
function wp_password_change_notification(&$user) {
	// send a copy of password change notification to the admin
	// but check to see if it's the admin whose password we're changing, and skip this
	if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) {
		$message = sprintf(__('Password Lost and Changed for user: %s'), $user->user_login) . "\r\n";
		// The blogname option is escaped with esc_html on the way into the database in sanitize_option
		// we want to reverse this for the plain text arena of emails.
		$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
		wp_mail(get_option('admin_email'), sprintf(__('[%s] Password Lost/Changed'), $blogname), $message);
	}
}
endif;

Save.

Enjoy.

https://ww.wp.xz.cn/plugins/disable-password-change-email/