How to Update Your Mac: Update vs Upgrade, and What to Do When It Won't Update

CodexFuse Team · 2026-10-27T21:19:01.837Z · 15 min read

How to update your Mac safely: the update vs upgrade difference, the 20 GB rule, back-up-first steps, automatic updates, and fixes when your Mac will not update.

Learning how to update your Mac takes about two minutes of clicking and up to a couple of hours of waiting, and the only part that truly matters is what you do before you start. Back up your files, free up at least 20 GB of space, plug in the power adapter, and then let Software Update do the rest. This guide walks through the whole process for macOS 27 Golden Gate, explains the difference between an update and an upgrade, and covers what to do when your Mac says it is up to date or refuses to install anything at all.

The short version: back up your Mac first, open System Settings, go to General, then Software Update, and click Update Now or Upgrade Now. Keep the Mac plugged in and do not close the lid while it installs.

How do I update my Mac?

You update your Mac in System Settings, in the Software Update panel, where Apple lists every update your Mac model can install. The whole job is five clicks, and the Mac downloads, installs, and restarts on its own. Here are the steps, exactly as Apple and the Mac Install Guide describe them.

1. Click the Apple menu in the top-left corner of the screen.
2. Click System Settings, then General in the sidebar.
3. Click Software Update and wait while your Mac checks for updates.
4. If an update is available, click Update Now (for a patch) or Upgrade Now (for a new macOS version).
5. Enter your administrator password if asked, then let the Mac finish and restart.

Your Mac checks for updates daily on its own, but you can force an immediate check by pressing Command-R in the Software Update panel or by closing and reopening it. If Software Update says your Mac is up to date, that means no update is available for your Mac model right now, which is not always the same as running the newest macOS. The unsupported-Mac section below explains that difference.

Should I update or upgrade my Mac?

An update and an upgrade are different things, and the button you click tells you which one you are getting. An update is a small patch inside the macOS version you already run, such as Tahoe 26.5 to 26.6, and it brings bug fixes and security patches without changing how anything looks. An upgrade jumps you to a whole new macOS version, such as Tahoe 26 to macOS 27 Golden Gate, with new features and sometimes a completely new look.

The download sizes and times in this table come from macOS Update's guide, which lists update downloads at 3 to 12 GB and the Tahoe full installer at about 12.5 GB. Both buttons live in the same Software Update panel, so read the button before you click it. If you only want the security fixes and not a new version, install the update and leave the upgrade alone.

Which macOS version should I update to?

The newest macOS is macOS 27 Golden Gate, released on September 14, 2026, but only Apple silicon Macs can install it. If your Mac has an Intel chip, macOS Tahoe 26.7 is the newest version it can run, and it was released on the same day. This split is the single most important fact in this guide, because it decides what Software Update will offer you.

The version numbers and dates in this table come from the Mac Install Guide, which lists macOS 27.0.1 as current as of September 28, 2026, and from macOS Update, which gives the Tahoe 26.7 build number. Setapp confirms that macOS 27 drops Intel support entirely and that Tahoe is the last macOS version that supports Intel Macs, running on Apple silicon plus just four Intel models. Apple also patches the current macOS and the two versions before it, so a Mac that cannot run macOS 27 still gets security updates on the version it can run.

To check what you have now, click the Apple menu and choose About This Mac. It shows the year your Mac was made, the macOS version, the processor, and the memory. Compare that model against Apple's compatibility list before you start, because an update that is not offered to your Mac is usually a compatibility limit, not a fault.

What should I do before updating my Mac?

Before you update your Mac, do three things: back up, free space, and plug in power. Apple designs minor updates to leave your files and apps alone, and the Mac Install Guide notes that modern updates install over the top without disturbing your work. Even so, a backup is the only protection if the install itself fails, and it takes far less time to make one than to rebuild a lost project.

Back up with Time Machine to an external drive, or use whatever backup you already trust, and confirm the backup finished before you click anything in Software Update. A first Time Machine backup can take several hours, so start it the night before a major upgrade. Our guide explains how to back up your Mac step by step.

Next, free up at least 20 GB of space. Both the Mac Install Guide and macOS Update give 20 GB as the working minimum, and Setapp puts the range for a major upgrade at 26 to 44 GB, because the installer needs room to download and unpack as well as install. If Software Update complains about space, restart the Mac, empty the Trash, and clear out downloads and apps you no longer use. Our guide shows how to free up disk space on your Mac without deleting anything you need.

Finally, plug the Mac into power and connect to a stable network. Apple Support notes that a laptop must have the power adapter plugged in to download updates automatically, and Setapp adds that you should not put the Mac to sleep or close its lid during installation. Save your work, close your apps, and make sure the battery is at 50 percent or more even on a desktop setup, because a power cut mid-install is the one failure that can leave a Mac unbootable.

How do I turn on automatic updates on my Mac?

You turn on automatic updates in the same Software Update panel, by clicking the information button next to Automatic Updates and choosing what the Mac is allowed to do on its own. The four switches are: check for updates, download new updates when available, install macOS updates, and install application updates from the App Store. Turn on the first two and leave the installs manual if you want control over timing, which is the setup the Mac Install Guide recommends for most people.

Apple also ships security fixes between full updates. Since macOS Tahoe 26.1 these arrive as Background Security Improvements, which replaced the older Rapid Security Responses, and they cover Safari, WebKit, and other system libraries. You control them in System Settings under Privacy and Security. If you turn them off, you still get the same fixes in a later software update, just later.

Automatic updates are not right for everyone. Setapp cautions that some updates break old apps, and the Mac Install Guide advises waiting one to two weeks after a major release before installing it on a business-critical Mac, so the community can report compatibility problems first. Security updates are different: install those within two to three days of release. If your Mac is managed by a workplace, the Automatic Updates switches may be greyed out, because an IT department can control updates through mobile device management, and in that case only your IT team can change the schedule.

How long does a Mac update take?

A minor update takes 20 to 40 minutes in total, and a major upgrade takes 1 to 2 hours or more, according to macOS Update's guide. The download is the variable part, because it depends on your connection speed, while the install and restart time is mostly fixed. The table below is computed from the Tahoe full installer's size of about 12.5 GB, which macOS Update lists, and it assumes the full connection speed is sustained, so treat it as a planning estimate rather than a promise.

A small patch download of 3 to 12 GB is proportionally faster, so most routine updates finish inside the 20 to 40 minute window even on a modest connection. After the install, expect the Mac to feel slow for the first hour while Spotlight re-indexes your files and background tasks catch up. The Mac Install Guide says most of that settles within 15 to 20 minutes, and macOS Update puts it at one to two days after a major upgrade, which is normal and not a sign that something went wrong.

How do I update my Mac with Terminal?

You can update your Mac from Terminal with Apple's softwareupdate command, which is faster than clicking through System Settings and is the method system administrators use. Open Terminal from Applications, then Utilities, or find it with Spotlight, and first list what is available with softwareupdate --list. If it reports no new software available, there is nothing to install.

To install everything available, run sudo softwareupdate --install --all and enter your administrator password when asked. The Mac Install Guide notes that the command accepts the short flags -i for install and -a for all, and that installation progress appears in the Terminal window in real time. Terminal updates work best for smaller updates rather than major upgrades, and you should still back up and free space first, because the command skips none of the preparation.

If you only want one specific update, macOS Update's guide shows the form softwareupdate --install IDENTIFIER, where the identifier is the name shown by the --list output. Do not interrupt a Terminal update once the install phase begins, for the same reason you should not interrupt the graphical installer: an interrupted install can corrupt the system.

What if my Mac says it is up to date but it is not the latest version?

If Software Update says your Mac is up to date while a newer macOS exists, your Mac model is almost certainly not compatible with that newer version. Setapp states the rule plainly: no update option means the Mac may not be supported by the new macOS, and on an Intel Mac, Software Update may say the Mac is up to date even though macOS 27 Golden Gate exists, because Golden Gate runs only on Apple silicon.

Your options in that case are, in order of safety: stay on the newest macOS your Mac officially supports and keep installing its security updates, since Apple patches the current version and the two before it; check Apple's compatibility list to confirm which version that is; or, only if you accept the risk, look at the unofficial OpenCore Legacy Patcher. Setapp's table shows that OpenCore supports Tahoe on about 80 models through version 3.0.0-rc.1, excludes Intel T2 Macs, and does not support macOS 27 at all. It is unsupported by Apple, can break with any future update, and is not something to install on a Mac you depend on for work.

There is one more possibility worth ruling out first. If your Mac is managed by a workplace or school, it may show that updates are managed externally, and the Mac Install Guide explains how to check: open System Settings, go to Privacy and Security, and look for Profiles. If no Profiles entry exists, the Mac is not managed. If one does exist, only your IT department can say when an update will be offered, and removing a corporate profile can break network access, email, and security certificates.

My Mac won't update — what do I do?

When your Mac won't update, work through the causes in order, because most failures come from storage, the network, or a corrupted download rather than from the Mac itself. Start with the cheapest fixes and only move to recovery tools when the simple ones fail. The Mac Install Guide and macOS Update agree on this order, and it resolves the large majority of failed updates.

1. Restart the Mac and try Software Update again. A restart clears temporary conflicts and a stuck download.
2. Check the date and time. An incorrect clock breaks the security checks that validate the update package.
3. Free up space until at least 20 GB is genuinely free. The installer will not count purgeable space or local Time Machine snapshots as free.
4. Switch networks or plug in an ethernet cable. Apple's servers can also be overloaded just after a major release, so try again during off-peak hours.
5. Run Disk Utility First Aid on the startup disk. Filesystem errors block installation, and First Aid catches them.
6. Download the full installer from the App Store instead of relying on Software Update.
7. Try the Terminal method, or create a bootable USB installer from the full installer app.

If the update is stuck on "Preparing" for more than an hour, force-restart by holding the power button, then boot into Safe Mode by holding Shift while starting up and try again. If the Mac will not boot at all, boot into Recovery Mode with Command-R and run First Aid from there, or restore from the Time Machine backup you made before starting. If none of that works, the last resort is to factory reset your Mac, which wipes the drive, so only do it with a verified backup in hand.

What should I check after updating my Mac?

After updating your Mac, verify the install and test the things you use every day before you call the job done. Open About This Mac and confirm the version number matches the one you installed, then open three or four of your most-used apps, check Wi-Fi, and test any external devices such as printers and drives. Most compatibility problems show up immediately, and catching them in the first hour is far easier than discovering them during a deadline.

Next, update your apps. App Store apps will show pending updates, but apps installed from the web need their own built-in updaters, and an app that worked on the old macOS can misbehave on the new one until its developer ships a compatible version. Finally, make a fresh backup of the updated system, so your next restore point is the new macOS rather than the old one. A quick way to confirm the screen and keyboard are behaving normally after the restart is to take a screenshot on your Mac and check that it saves where you expect. If you also keep an iPhone, the steps to update your iPhone follow the same back-up-first pattern, and on a PC the process is different, as our guide to update Windows 11 shows.

Sources

• Apple Support, "Keep your Mac up to date" — https://support.apple.com/en-in/guide/mac-help/mchlpx1065/mac
• Mac Install Guide, "How to Update macOS" — https://mac.install.guide/macos/update
• macOS Update, "How to Update macOS: Software Update, App Store & Terminal" — https://macosupdate.com/guides/how-to-update-macos
• Setapp, "Upgrade macOS: How to update your Mac operating system step-by-step" — https://setapp.com/how-to/how-to-update-macos

Frequently Asked Questions

Will updating my Mac delete my files?

No. A standard macOS update preserves your files, apps, and settings, and both the Mac Install Guide and macOS Update state this directly. Back up first anyway, because a failed install is the one event that can put your data at risk, and a backup is cheap insurance.

Why does Software Update say my Mac is up to date when a newer macOS exists?

Because your Mac model is not compatible with that newer version. The most common case is an Intel Mac: macOS 27 Golden Gate runs only on Apple silicon, so an Intel Mac correctly reports itself as up to date on Tahoe 26.7. Check Apple's compatibility list to confirm, and keep installing the security updates for the version your Mac can run.

How long does a Mac update take?

A minor update takes 20 to 40 minutes in total, and a major upgrade takes 1 to 2 hours or more, according to macOS Update's guide. The download time depends on your connection: a 12.5 GB installer takes about 17 minutes at 100 Mbps and about 67 minutes at 25 Mbps, assuming the full speed is sustained.

Can I stop a Mac update once it has started?

You can cancel during the download phase by clicking the X in the Software Update window, but once the installation begins and the Mac restarts, do not interrupt it. Interrupting an install in progress can damage the macOS installation, according to macOS Update's guide.

Should I update to the latest macOS right away?

For security updates, yes, install them within a few days. For a major upgrade on a Mac you depend on for work, wait one to two weeks after release so early bugs and app compatibility problems surface first. That is the advice from both the Mac Install Guide and macOS Update, and it is the safest rule for business-critical machines.