My MacBook Air needs an update, but it's not available

Which model MBA? What have you tried? Any error messages?

If you're running Sierra now your Mac may be simply too old to run the macOS version required for your other software. In that case the only options are to not use the software, to see if an older version is available, or to buy a newer model Mac.

Identify your iMac model - Apple Support

Shiahluna Said:

"My MacBook Air needs an update, but it's not available: I am trying to update my software to use Ableton live and I can't update the software or version of safari. Can you please help?"

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Updating the macOS:

Determining which Update(s) will Install:

I. Verify Compatibility:

A. Start Here: Learn About Compatibility and how to Identify your Specific Mac Model - Apple Support

B. How to Verify:

I Reveal your Model:

What is the Model of your Mac? To find out...

1. Go to: Apple menu
2. Click: About this Mac
3. View: Second Line-Down

then...

II. Compare the Results:

See if the Model you found is shown here:

• macOS Ventura is Compatible with these Computers - Apple Support
• macOS Monterey is Compatible with these Computers - Apple Support
• macOS Big Sur 11 Hardware Requirements - Apple Support
• macOS Catalina 10.15 - Hardware Requirements - Apple Support
• macOS Mojave 10.14 - Hardware Requirements - Apple Support
• macOS High Sierra 10.13 - Hardware Requirements - Apple Support
• macOS Sierra 10.12 - Hardware Requirements - Apple Support

III. If Compatible:

Back Up your Mac First:  Be certain you Create a Time Machine Backup of your Mac, so that way you can have something to restore your Mac from, should anything go wrong with the reconfiguration.

What is your MacBook type? Check via the apple logo in the menu bar>about this Mac.

It could be that when you go to the App Store to update (if you're really running Sierra) that your Mac is not showing any updates. Then it is too old to upgrade further

what year is the MacBook so I can check and tell me what error came up

(I had a problem with my 2017 MacBook Air with it not installing latest macOS even it is compatible)

reply back anytime

You probably is using macOS Catalina ok