You can use Epson Download Navigator (which is installed the first time you install the printer driver) to notify you when new updates are available for download. Download Navigator analyzes the Epson software (drivers, utilities, firmware, etc.) already installed on your computer and notifies you if new updates are available for download.
If you've already installed a Windows printer software, you can update the software by selecting Driver Update on the Maintenance tab in the printer software.
If you're using Mac OS 10.5 or later, you can update the driver selecting Software Update in the menu.