No, you cannot upgrade. The graphics are part of the processor/cpu. It is not a separate or add-on graphics card.
This message was posted on behalf of Intel Corporation
For better performance on games you can try installing the latest graphics driver, you can download it here:
If you get an error installing this driver, uninstall the old driver and install this driver manually.
Uninstalling the Intel® Graphics Driver
Manually Install an Intel® Graphics Driver in Windows® 10 and Windows 8*/8.1*
How to Manually Install a Graphics Driver in Windows 7*