Apple Releases Safari Technology Preview 256
Apple's latest Safari Technology Preview update delivers fixes across rendering, JavaScript, security and more for developers and testers.
Updated on Nov. 5, 2026 in Software
Apple released Safari Technology Preview 256, a build that includes fixes and updates across areas including CSS, JavaScript, networking, security, WebGL and WebRTC. The update is delivered through the Software Update mechanism to anyone who has downloaded the browser from Apple's website.
Why it matters
Safari Technology Preview lets developers and users test upcoming browser changes before they reach the standard Safari release. Apple's stated aim with the program is to gather feedback on its browser development process.
Safari Technology Preview 256 covers fixes in 17 categories, from Accessibility and Animations to WebRTC and Web Inspector, and is compatible with macOS Tahoe and macOS Golden Gate. The full list of changes is available in the complete release notes, though the extraction does not detail the specific fixes within each category.
The players
Apple
Apple is the technology company that develops the Safari browser and publishes the Safari Technology Preview program for testing upcoming browser builds.
The details
The update arrives through the Software Update mechanism in System Preferences or System Settings. It runs side-by-side with the existing Safari browser and does not require a developer account to download and use.
Timeline
March 2016: Safari Technology Preview was first introduced.
November 4, 2026: Safari Technology Preview 256 was released.
Roadmap
Apple's Safari Technology Preview has been running since March 2016 as a channel for previewing browser work before it ships in the standard Safari release. Build 256 continues that cadence, offering developers a testing ground for changes spanning rendering, scripting, media and security.
Developers and users who want to test upcoming Safari behavior can download the update through Software Update without a developer account. Running it alongside the standard Safari browser lets people compare the two without replacing their everyday browser.
The takeaway
Safari Technology Preview gives readers a low-risk way to see how the browser is changing before those changes become standard. Installing it alongside regular Safari keeps daily browsing unaffected while still providing early access.
Further reading
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