Deactivate automatic updates for WordPress core, themes, or plugins.

functions.php

// disable core updates

function remove_core_updates() {

    global $wp_version;

    return(object) array('last_checked' => time(), 'version_checked' => $wp_version,);

}


add_filter('pre_site_transient_update_core', 'remove_core_updates');

add_filter('pre_site_transient_update_plugins', 'remove_core_updates');

add_filter('pre_site_transient_update_themes', 'remove_core_updates');