I'm working on an older macbook using os x yosemite version 10.10.5 How can I update the os?

You can get to at least 10.11, and possibly later.

Your upgrade options are determined by the Mac model and year.

Here’s the general info, and links to specific upgrades: How to get old versions of macOS - Apple Support

Use only Safari to access the macOS upgrade kit downloads.

jalal220 wrote:

Q: I'm working on an older macbook using os x yosemite version 10.10.5 How can I update the os?

You can get to at least 10.11, and possibly later.

Your upgrade options are determined by the Mac model and year.

If you post the MacBook model year, somebody here can then tell you your available upgrades.

Click on the following blue text for general info, and links to specific upgrades, and supported Mac details:

How to get old versions of macOS - Apple Support

Use only Safari to access the macOS upgrade kit downloads.

Q: I'm working on an older macbook using os x yosemite version 10.10.5 How can I update the os?