How to Update macOS on Your Mac Safely

Your Mac offers an update just as you’re about to start work, and the restart can’t happen right now. Before you update macOS, check whether the offer is a small update or a major upgrade.

The version you choose matters as much as the button you click.

Start with the checks below, then use Software Update when you can leave the Mac to finish.

If nothing is offered or the download fails, there are a few useful checks before you need installation help.

Before you start: model, backup, power, and space

A Mac’s family name alone isn’t enough to choose an operating system. Two MacBook Air models can support different releases, so check your exact model and the release you intend to install.

Software Update offers versions compatible with your Mac.

1. Find your model under Apple menu > About This Mac. Note the full model name, including its year or chip where shown. Apple’s model-identification guide explains how to use System Information if you need more detail.
2. In the same window, note the installed macOS name and version. Click the version number if you need the build. Check the installed version before comparing it with an update offer.
3. For a major upgrade, match the model against Apple’s list for that release. For example, use the macOS 27 compatibility list if that is your target. The macOS compatibility checker is a convenient starting point, followed by Apple’s exact model list.
4. Finish a backup before installation. If Time Machine is already set up, choose Back Up Now from its menu and wait until the latest-backup date and time confirm completion. Time Machine’s progress display distinguishes an ongoing backup from a finished one.
5. Connect your MacBook to its power adapter and use a stable internet connection. Save documents, finish calls, and allow time away from the Mac before accepting a restart. Keep the Mac powered throughout installation.
6. Check System Settings > General > Storage on macOS Ventura 13 or later. Earlier systems use About This Mac > Storage. Compare available space with any requirement the installer shows. Apple’s storage instructions cover both paths.

If you need to set up a backup disk, follow the Time Machine backup guide first. Setup may ask to erase the external disk, which deletes its contents.

Don’t accept an erase prompt for a disk holding files you still need. Apple’s backup setup describes that prompt.

Before a major upgrade, check the developers’ compatibility guidance for essential apps and accessories. On a shared Mac, agree on the timing with other users.

On a work or school Mac, ask the administrator before changing its approved macOS version, especially if an update is restricted.

Choose an update or a major upgrade

An update changes the version within the macOS release you already have. An upgrade moves to a different major release. Apple’s update definitions distinguish these choices, even though both can appear in Software Update.

Read the offered version before proceeding. If you want to stay on your current major release, look for other available updates or more information where offered.

Select an update for that release if one is listed. Don’t accept a major upgrade simply because it has the most prominent button.

“Up to date” refers to “Up to date”; it does not mean every Mac can install the same release. Compatibility depends on the exact model, and macOS version list is separate from its model compatibility lists.

How to update macOS using Software Update

Software Update is the normal starting point for both updates and supported upgrades. The steps below use System Settings. On an older Mac with different menus, search for Software Update with Spotlight.

If the Mac doesn’t have Software Update, use Apple’s other download methods below. Apple’s Software Update guide also covers finding the pane.

1. Open the Apple menu > System Settings. Select General > Software Update.
2. Wait while the pane checks for available software. Read the version, details, and any storage or restart requirement before you select it.
3. Choose the update you intend to install. Depending on the offer and its stage, the button may say Update Now, Upgrade Now, or Restart Now. Follow the actual prompt rather than expecting one label.
4. If you’re asked for an administrator password, have an authorized administrator approve the installation. Don’t enter someone else’s credentials or try to bypass a managed restriction.
5. Accept the installation prompts only after your backup is complete and your work is saved. Keep the Mac connected to power, leave the lid open, and let it restart as needed.
6. After you can log in again, open About This Mac and check the installed version. Reopen Software Update to see whether another compatible update remains, then check the apps and accessories you rely on.

The screen can go blank or show a progress bar more than once during installation. The installation sequence can also include several restarts.

Once installation is underway, avoid putting the Mac to sleep or closing its lid.

Install later when you need the Mac now

Before installation starts, you can leave Software Update and return after saving your work. If Update Tonight is offered, leave the Mac turned on, connected to power and online for the overnight installation. See Software Update settings.

Scheduling an installation for later is different from interrupting one already in progress. Don’t force a shutdown to postpone an active installer.

Choose a later installation time before the installer starts, using the options shown on your Mac.

Set automatic updates and check security controls

Automatic downloads and automatic installation are separate choices. You can have the next update ready to install without treating its download as a completed installation.

Review the settings with the Mac’s other users before changing when it may restart.

1. Open System Settings > General > Software Update. Click the information button next to Automatic Updates where shown.
2. Review Download new updates when available and Install macOS updates. Turn on the options that match how you want this Mac maintained.
3. If the pane includes Install Security Responses and system files, review that option too. It covers system files and Rapid Security Responses in Apple’s settings reference. Use the labels present on your installed version.

Newer security patches also have a separate control. On macOS Tahoe 26.1 or later, Background Security Improvements provide smaller security fixes between regular updates.

Open System Settings > Privacy & Security > Background Security Improvements and check Automatically Install.

These security improvements are enabled by default on supported systems. Don’t switch them off to troubleshoot an ordinary failed download.

They complement regular software updates, so continue checking Software Update even when background protection is enabled. Apple’s security-improvement guidance explains how the fixes reach supported Macs.

If no update appears

If Software Update says the Mac is up to date, recheck once. Use Check for Updates if shown, press Command-R in Software Update, or close and reopen the pane. These are Apple’s recheck options.

If you expected a major release, compare your exact model with its compatibility list. An older Mac may already have the newest version offered for that model.

On a managed Mac, ask the administrator whether the release is approved or being held back before looking for another installer.

For a supported version you need to obtain another way, use Apple’s macOS download page. It separates current Software Update downloads from methods for older releases.

A download link doesn’t make an incompatible Mac compatible, so stop if the installer rejects your model.

If there isn’t enough space

There isn’t one free-space figure that fits every update and starting system. If the installer reports insufficient space, stop and review your storage before retrying.

Apple’s installation-error guidance identifies insufficient storage as a cause of failure.

1. Open the Storage screen and review large files you recognize. Copy important files to a suitable external disk and verify the copy before deleting the original.
2. Review Downloads individually and keep anything you still need. Don’t launch unfamiliar software to identify it, and don’t delete a whole folder because its name sounds temporary.
3. Emptying Trash permanently deletes every item inside. Review the Trash and put back anything you need before emptying it. Apple’s deletion warning covers this consequence. Space becomes available after emptying, as explained in Apple’s space-saving guidance.
4. Return to Storage, allow it to update, and retry only when the installer’s space warning is resolved. Avoid manually deleting system folders or caches to meet a space target.

Keep your backup disk available as a backup. Erasing it to make room for an update would remove the recovery copy you prepared before starting.

If personal files don’t account for the space problem, use Apple’s storage guidance or get help before deleting unfamiliar data.

If a download fails or installation seems stuck

First check what stage the Mac has reached. A download error while you can still use the desktop is different from an Apple logo and progress bar during installation.

The next step depends on that distinction.

1. For a failed download at the desktop, note the exact error. Confirm that your normal internet connection works and review any storage warning. Installation needs internet access for firmware and model information too. Apple’s error checks cover these requirements.
2. If no installation is active and your work is saved, restart normally, reopen Software Update and retry once.
3. If the same error returns, stop repeated attempts. Keep the error message and use Apple’s installation-error instructions or contact the administrator or Apple Support. Don’t change network security or management controls to force the download.

During installation, a progress bar can move slowly or pause for a long time. Apple’s progress-bar guidance notes that an installation may need to run overnight.

Keep power connected and allow it time rather than using a fixed countdown to decide it has failed.

If the Mac still won’t finish starting up, use that Apple support page for the next diagnosis. Recovery, disk repair, or firmware work needs the instructions for your model and the actual symptom.

Erasing the Mac is not a routine update step, and you shouldn’t jump to it from a slow download.

Frequently Asked Questions

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