Apple has rolled out release candidates for two of its continuing macOS versions today: Sequoia 15.8.3 and Tahoe 26.7.3. These updates are aimed at maintaining security support for older Mac users who aren’t ready to move to macOS 27 just yet.
What’s included in these release candidates
The Sequoia 15.8.3 RC has been assigned build number 24H314, while Tahoe 26.7.3 carries build 25G416. So far, the company has kept the release notes short—each update is described simply as bringing “security fixes for your Mac.” More detailed information about the vulnerabilities addressed is expected when the updates are officially released. These RCs come less than a week after the public release of Sequoia 15.8.2 and Tahoe 26.7.2, which patched over 150 security issues.
How this fits into Apple’s wider software strategy
Alongside these RCs, Apple also released the first developer beta of macOS 27.3. That upcoming update introduces new features in Safari—including Vertical Tabs and Adaptive Dark Mode—and expands Siri’s AI enhancements, potentially adding support for Traditional Chinese, Norwegian, Turkish, and Vietnamese. This signals that while Apple continues to add new capabilities in its newest operating system, it still supports its older platforms with essential updates.
For users on macOS Sequoia or Tahoe who prioritize stability and security over new features, these release candidates are a reassuring step—especially given the volume of vulnerabilities addressed in the previous tenth week. Being part of the RC track means they’re close to what the final update will look like, so testing can help surface local compatibility issues.
What to watch for: When the final versions of 15.8.3 and 26.7.3 drop, users should check whether the detailed security advisories reveal fixes for components like Safari or kernel-level vulnerabilities. Also, for those on macOS 27.3, the new Safari and Siri enhancements may shift the balance for whether to upgrade off Sequoia or Tahoe.
