1: Insert the following code into the functions.php file in the root directory of the current WordPress theme:
add_filter(‘pre_site_transient_update_core’, create_function(‘$a’, “return null;”)); // Close core prompts
add_filter(‘pre_site_transient_update_plugins’, create_function(‘$a’, “return null;”)); // Close plugin prompts
add_filter(‘pre_site_transient_update_themes’, create_function(‘$a’, “return null;”)); // Close theme prompts
remove_action(‘admin_init’, ‘_maybe_update_core’); // Disable WordPress from checking for updates
remove_action(‘admin_init’, ‘_maybe_update_plugins’); // Disable WordPress from updating plugins
remove_action(‘admin_init’, ‘_maybe_update_themes’); // Disable WordPress Update theme
2: Add the following code to the wp-config.php configuration file in the WordPress root directory:
define( ‘AUTOMATIC_UPDATER_DISABLED’, true );