Apple Ends Intel Mac Support as Rosetta 2 Enters Phaseout

Figure 1: Visual representation of the BeyondTrust vulnerability chain

Apple confirmed on June 9, 2025, during its Worldwide Developers Conference (WWDC) keynote that macOS Tahoe will be the final major operating system release to support Intel-based Mac computers. The company simultaneously announced that Rosetta 2, the translation layer enabling x86 applications to run on Apple Silicon, will begin a phased deprecation process.

The announcement affects millions of Mac users still operating Intel-based hardware purchased between 2006 and 2020. According to Apple's developer documentation updated on June 9, macOS 27, expected in 2026, will require Apple Silicon processors exclusively. Intel Mac owners will continue receiving security updates for macOS Tahoe but will not have access to future feature releases.

Rosetta 2, introduced alongside the first M1 Macs in November 2020, has served as a critical bridge technology allowing users to run legacy x86 applications on ARM-based Apple Silicon. Apple's updated developer documentation indicates that Rosetta 2 will remain functional in macOS Tahoe but developers should prioritize native Apple Silicon builds. The company has not specified an exact timeline for Rosetta 2's complete removal.

The transition marks the conclusion of Apple's five-year migration from Intel processors to its custom ARM-based chips. Apple first announced the transition at WWDC 2020, initially projecting a two-year timeline that has extended due to the breadth of the Mac product line and the need to support professional workflows dependent on x86 software.

Apple's WWDC 2025 keynote on June 9 included confirmation of the Intel Mac support timeline that industry observers had anticipated. The company announced macOS Tahoe as the next major release, with explicit documentation stating it would be the final version supporting x86 architecture.

According to Ars Technica's coverage published on June 9, Apple's presentation emphasized the performance and efficiency advantages of Apple Silicon while acknowledging the transition period required for remaining Intel Mac users. The company did not provide specific end-of-life dates for security support on Intel hardware.

9to5Mac reported that Apple's internal documentation, made available to developers following the keynote, specifies that macOS 27 will require Apple Silicon. The publication noted that Apple has historically provided approximately three years of security updates for operating systems after they are superseded by newer versions.

The Verge's reporting highlighted that the announcement affects Intel Macs sold as recently as 2020, when Apple began shipping M1-based systems. Some professional Mac Pro configurations with Intel Xeon processors were sold into 2021 before Apple completed the transition across its entire lineup.

Apple's developer documentation for Rosetta 2, updated on June 9, now includes deprecation notices encouraging developers to submit native Apple Silicon builds to the App Store. The documentation states that Rosetta 2 translation will continue functioning in macOS Tahoe but warns that future macOS versions may not include the translation layer.

Figure 2: How the authentication bypass vulnerability works

Apple's primary technical claim centers on the maturity of the Apple Silicon ecosystem. According to the company's developer documentation, the vast majority of Mac applications now have native Apple Silicon versions available, reducing dependency on Rosetta 2 translation.

The company's documentation states that Rosetta 2 translates x86_64 instructions to ARM64 at installation time for most applications, with just-in-time translation handling remaining cases. Performance overhead varies by application but typically ranges from 10 to 20 percent compared to native execution, according to Apple's technical specifications.

Ars Technica reported that Apple cited internal metrics showing over 90 percent of App Store applications now include native Apple Silicon support. The company did not provide statistics on enterprise or specialized software that may still require x86 compatibility.

9to5Mac noted that Apple's announcement included updated system requirements for macOS Tahoe, confirming support for Intel Macs with at least 4GB of RAM and specific processor generations. The publication reported that some older Intel Macs supported by macOS Sequoia will not receive macOS Tahoe.

The transition completion allows Apple to optimize macOS exclusively for Apple Silicon architecture. Developers can focus resources on a single processor architecture rather than maintaining dual builds, potentially accelerating feature development and reducing testing complexity.

Apple Silicon Macs have demonstrated significant performance and energy efficiency advantages over their Intel predecessors. The M-series chips integrate CPU, GPU, and Neural Engine on a unified memory architecture, enabling capabilities not possible with discrete component designs.

Users who upgrade to Apple Silicon hardware gain access to features exclusive to the architecture, including enhanced machine learning performance, improved battery life on portable Macs, and support for iOS and iPadOS applications through the shared ARM architecture.

Enterprise customers benefit from a clearer planning horizon. The explicit timeline allows IT departments to budget for hardware refreshes and plan software migration projects with defined deadlines rather than uncertain deprecation schedules.

Figure 3: Privilege escalation from user to SYSTEM level

Intel Mac owners face hardware obsolescence regardless of their machines' functional condition. Professional users who invested in high-end Intel Mac Pro configurations may find their hardware unsupported before typical enterprise refresh cycles complete.

Specialized software dependent on x86 architecture may not receive Apple Silicon updates. Scientific computing applications, legacy enterprise software, and certain virtualization workloads may require users to maintain separate Intel hardware or transition to alternative platforms.

The Rosetta 2 deprecation creates uncertainty for users dependent on x86 applications. While Apple has not announced a specific removal date, the deprecation notice signals that long-term reliance on translation is not advisable.

Boot Camp, Apple's utility for running Windows on Intel Macs, has no equivalent for Apple Silicon. Users requiring native Windows execution must use virtualization solutions with associated performance overhead and licensing considerations.

Rosetta 2 operates as a translation layer between x86_64 application code and the ARM64 instruction set used by Apple Silicon. The system employs two translation mechanisms depending on application characteristics.

For most applications, Rosetta 2 performs ahead-of-time translation during installation. The system analyzes the x86_64 binary and generates equivalent ARM64 code stored alongside the original. Subsequent launches execute the translated code directly without runtime translation overhead.

Applications using just-in-time compilation or dynamically generated code require runtime translation. Rosetta 2 intercepts x86_64 instructions during execution and translates them to ARM64 equivalents. This approach incurs greater performance overhead but maintains compatibility with complex software architectures.

The translation layer handles differences in memory ordering between x86 and ARM architectures. Intel processors use a stronger memory model than ARM, requiring Rosetta 2 to insert memory barriers ensuring correct behavior for multithreaded applications.

Technical context (optional): Rosetta 2 cannot translate kernel extensions or low-level system software. Applications requiring kernel-level access must provide native Apple Silicon implementations. The translation layer also does not support AVX vector instructions, affecting some scientific and media processing applications.

Apple's transition completion establishes a precedent for major platform architecture changes. The five-year migration demonstrates that large-scale processor transitions are feasible for consumer computing platforms, potentially influencing decisions at other hardware and software vendors.

The Intel Mac deprecation affects the broader x86 ecosystem. Apple represented a significant customer for Intel's mobile and desktop processors, and the complete transition removes a major commercial validation for x86 in premium consumer hardware.

Developer tooling and practices evolved during the transition period. Universal binaries, which contain code for multiple architectures in a single package, became standard practice. These techniques may prove valuable as other platforms consider architecture transitions.

The enterprise software market faces pressure to modernize. Applications that have not received Apple Silicon updates will become incompatible with new macOS versions, forcing vendors to invest in updates or risk losing Mac customers.

Confirmed:

• macOS Tahoe is the final release supporting Intel Macs
• macOS 27 will require Apple Silicon
• Rosetta 2 is entering deprecation with warnings in developer documentation
• Over 90 percent of App Store applications have native Apple Silicon support

Unclear:

• Specific end date for Intel Mac security updates
• Timeline for Rosetta 2 complete removal
• Whether any exceptions will exist for specific Intel Mac models
• Plans for enterprise customers with extended support requirements

Developer adoption metrics for native Apple Silicon builds will indicate ecosystem readiness for Rosetta 2 removal. Apple typically tracks and publishes these statistics at developer conferences.

Enterprise software vendors' update announcements will signal the pace of professional application migration. Key indicators include updates from Adobe, Microsoft, and specialized industry software providers.

Security update schedules for macOS Tahoe on Intel hardware will clarify the practical support timeline. Apple's historical patterns suggest approximately three years of security updates following a major release.

Third-party virtualization solutions may announce enhanced x86 compatibility features for Apple Silicon, potentially extending the useful life of legacy applications beyond Rosetta 2's availability.