Capthca Bypass Update (PHP Script)

I have a php script that was created for me a while back to basically auto reply at a site for me and when it sends the messages it has to bypass the captcha protection (3 random digits, images not text) it used to work fine at bypassing it however I am told that the site my script works at the captcha has been updated there so my script needs to be updated to work with the new version or whatever. I don't know much more then that...