Disabling auto update of wordpress core files without using plugin. For disabling wordpress auto update without plugin you need cpanel or FTP details for accessing wp-config.php file.
Start editing the wp-config.php file and add the following code to wp-config.php file. So that it will stop auto update of wordpress core file automatically.
This will disable WordPress auto updates of core, theme and plugins
define( 'automatic_updater_disabled', true );This will only disable auto update of WordPress core
define( 'wp_auto_update_core', false );And then save it that’s all here after your wordpress website will not be updated automatically.
Happy Blogging.
Note : Disabling these updates is strongly discouraged by wordpress.