Can my PC handle an update?

I succesfully installed Yosemite on my old PC. My question is, can I update to a newer OS version from within the OS? If so, which OS should be able to work on my PC? Specs are bellow. I am also only able to run Legacy bios.

  • Motherboard: MSI 2A9C
  • BIOS: American Megatrends Inc, version 6.07
  • CPU: Intel Core i3-540
  • GPU: NVIDIA GeForce 315 1GB
  • Sound: Realtek ALC888
  • Network: Realtek Semiconductor RTL8168D/8111D PCI-E Gigabit Ethernet Adapter
submitted by /u/Huge_Aardvark6937
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