我一直使用upgrader_process_complete 挂钩：

function my_plugins_update_completed( $upgrader_object, $options ) {

    // If an update has taken place and the updated type is plugins and the plugins element exists
    if ( $options[\'action\'] == \'update\' && $options[\'type\'] == \'plugin\' && isset( $options[\'plugins\'] ) ) {
        foreach( $options[\'plugins\'] as $plugin ) {
            // Check to ensure it\'s my plugin
            if( $plugin == plugin_basename( __FILE__ ) ) {
                // do stuff here
            }
        }
    }
}
add_action( \'upgrader_process_complete\', \'my_plugins_update_completed\', 10, 2 );

希望有帮助