Apple has started testing the next Mac update. After releasing macOS Tahoe 26.2 on Friday, December 12, 2025, Apple has now seeded macOS Tahoe 26.3 beta 1 for developers.
The first macOS 26.3 developer beta arrives as build 25D5087f. It is the earliest look at what Apple plans to ship in the next point release, so changes can be small at first and expand across later betas.
If you run the beta, remember the basics. Back up your Mac, expect bugs, and avoid installing it on a machine you rely on for daily work.
How to update to macOS 26.3 beta 1
- Open System Settings
- Go to General
- Tap Software Update
- Select Beta Updates
- Choose the macOS Tahoe Developer Beta option
- Download and install the update
Changes in macOS 26.3 beta 1
Apple has not shared a detailed public changelog for macOS 26.3 beta 1 yet, and early testers are still digging through what is new. In the first beta cycle, Apple often focuses on bug fixes, performance work, and under-the-hood changes that do not show up as headline features.
If Apple posts updated release notes as the beta progresses, they tend to clarify what changed from one beta to the next. For now, the main news is simple: macOS Tahoe testing has moved on from 26.2 to 26.3, with build 25D5087f leading the cycle.
If you have installed macOS 26.3 beta 1, let us know what you are seeing in the comments.
