I have an iMac 27 inch, late 2013 OS X Yosemite, can i update it any further?
Can this iMac be updated any further?
iMac 27″, OS X 10.10
Yes, you can update to MacOS Catalina:
macOS Catalina is compatible with these computers - Apple Support
How to get old versions of macOS - Apple Support
Hope this helps and solves your question. Do not hesitate to ask if you need more information.
Bodyxs