functions.php

<?php

/**
 * Register Latest Style
 * 
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/register-recent-style/
 */
function be_register_latest_style( $handle, $src, $deps, $ver, $media ) {
	global $wp_styles;
	if( !isset( $wp_styles->registered[$handle]->ver ) || version_compare( $ver, $wp_styles->registered[$handle]->ver ) ) {
		wp_deregister_style( $handle );
		wp_register_style( $handle, $src, $deps, $ver, $media );
	}
}


// Example of Usage
function be_enqueue_styles() {
	be_register_latest_style( 'genericons', get_stylesheet_directory_uri() . '/css/genericons/genericons.css', false, '3.0.2' );
	wp_enqueue_style( 'genericons' );
}
add_action( 'wp_enqueue_scripts', 'be_enqueue_styles' );