Why auto-updating is usually a good idea
Most updates fix security bugs. Delaying them leaves known vulnerabilities open longer than the update itself would ever risk. For the App Store, automatic updates are a safe default because Apple reviews and signs every build.
The auto-update mechanisms on macOS
There is no single auto-update switch on a Mac. Each install source brings its own mechanism:
- Mac App Store. The Automatic Updates setting (App Store > Settings) installs new versions in the background; Apple reviews and signs every build, the lowest-risk channel to automate.
- Sparkle-based apps. Apps embedding the Sparkle framework check an appcast feed and can offer to automatically download and install future updates, per app.
- Vendor background updaters. Microsoft AutoUpdate, Google's updater, and Adobe's updater run on their own schedules and manage their own product families.
- Homebrew. Nothing runs in the background by default; casks update when you run
brew upgrade --cask.
The update sources guide maps which channel owns which app.
The risks that make people nervous
The legitimate worries are not about updating in general, they are about a specific bad update slipping through:
- Downgrade attacks. An attacker serves an older version with a known vulnerability and calls it an update.
- Tampered downloads. A download is modified in transit, or the metadata is delivered over cleartext HTTP and redirected somewhere else.
- Lookalike replacements. Something that is not really the same app — a different developer or bundle identity — replaces the app you trusted.
- Broken releases. Not malicious, just buggy: a new version that crashes or breaks compatibility, with no easy way back.
What makes an update trustworthy
A safe auto-update is one where these checks pass before anything is replaced:
- HTTPS metadata. Update feeds and download URLs use HTTPS, and redirects are re-checked rather than blindly followed.
- Signature verification. Sparkle updates are verified against the installed app's public key; direct releases are Developer ID signed and Apple-notarized.
- Matching identity. The replacement has the same bundle identifier and signing team as the installed app.
- Forward version only. The new build is newer than the installed one, so a downgrade is rejected.
When to review instead of auto-install
Let low-risk, well-verified updates install automatically. Slow down and review when an update is a direct download with no signature, when the installed app's signing team cannot be verified, when an installer package comes from an unknown source, or when a release is large or changes how the app handles your data. In those cases, handing off to the vendor's own updater or installing manually is often the safer call.
When a good update is still the wrong update
Even an authentic, correctly signed update can be the wrong thing to install today:
- Breaking changes. Major versions remove features, change file formats, or drop plugin compatibility.
- Regressions. New releases ship new bugs, sometimes in the exact feature you rely on.
- License changes. An update can switch an app to a subscription or change its license terms.
- Workflow-critical timing. Updating mid-project trades a known-good setup for an unknown one.
Signature checks confirm an update is genuine, not that it fits your setup.
A practical auto-update policy
You do not have to choose between automating everything and reviewing everything:
- Auto-update the low-risk tier. Browsers, chat clients, and small utilities benefit most from fast security fixes; a regression there costs little.
- Review the workflow-critical tier. Development tools, audio and video suites, and apps with plugin ecosystems deserve a release-notes check first.
- Never auto-install what cannot be verified. Unsigned direct downloads and unknown installers get a manual review every time.
Keep a rollback path for that tier: back up the app before updating.
Scheduled review beats blind auto-update
The failure mode of manual updating is forgetting — skipped updates quietly pile up. A short weekly pass fixes that: review what is pending across every channel, skim release notes for critical apps, and install deliberately. The guide to updating Mac apps safely walks through the routine.
How macCurrent handles this
macCurrent rejects cleartext update metadata, verifies Sparkle archives against the installed app's EdDSA public key, refuses served downgrades, and only performs an automatic replacement when the bundle identifier and signing team match. Updates that cannot be verified that way are opened for review instead of installed silently. The full detail is in the security model.
It is a free beta delivered as one universal app for Apple silicon and Intel Macs on macOS 15 or later — download the free macCurrent beta.
Frequently asked questions
Should I turn on automatic updates for Mac App Store apps?
For most people, yes. Apple reviews and signs every App Store build, and you can re-download apps from your purchase history if something goes wrong. Turn it off only while a specific app is critical to a project in progress.
Can I auto-update some Mac apps but not others?
Partly. Sparkle-based apps store the choice per app, and vendor updaters can be set to manual or automatic for their own products. The App Store toggle covers all App Store apps at once, so a per-app policy means combining controls.
How often should I review pending app updates?
Weekly is a good default. Letting updates pile up for months leaves known vulnerabilities open and makes each eventual update bigger and riskier, while a short scheduled review keeps you current without installing anything blindly.