Enqueue WP Styles with versioning to avoid cache when updated
/** * Enqueue styles and scripts */ function enqueue_styles() { wp_enqueue_style( 'my-style', PLUGIN_URI.'my.css', array(), filemtime(PLUGIN_PATH.'my.css'), 'all' ); } add_action( 'wp_enqueue_scripts', array($this, 'enqueue_styles'));