Apple has quietly pushed out a firmware update—version 1.4.90—for its 140W USB-C Power Adapter as of September 8, 2026. Users aren’t being given specific release notes, so the changes under the hood remain undisclosed. Version 1.4.90 applies automatically once the charger is in use with a Mac or other connected device; there’s currently no manual installation path.
What We Know (and What We Don’t)
Apple itself hasn’t shared details on what improvements or fixes this update brings. Typically, such updates address issues around power delivery, thermal regulation, or compatibility—but in this case, there’s no official word one way or the other. Version 1.4.90 replaces whatever firmware was previously running on the 140W adapter.
The installation happens automatically. Simply having the power adapter plugged into a Mac—or another compatible device—will trigger the update over time. There is no official tool or interface to check for updates or force the installation manually; owners will have to rely on the adapter being used in normal conditions.
Why This Matters
The 140W USB-C Power Adapter is designed for high-performance MacBook Pro models that demand more power, especially during intensive tasks. Firmware updates for power adapters are rare in Apple’s ecosystem, so this one could be addressing an issue that’s important—power stability, safety, or thermal efficiency. Since Apple doesn’t share firmware version details publicly, users often don’t know what version they have or what has changed until noticeable improvements—or problems—appear.
For users: if you own this 140W charger, just keep using it. The firmware update should arrive in time. If you encounter overheating, charging failures, or compatibility glitches, this update might already fix them. But since there’s no way to confirm status, those issues will act as your indicators.
Behind the scenes, this move shows Apple overseeing not just software on devices, but the fundamental components that deliver power. For demanding laptops or mobile devices users rely on stable, safe charging—and a firmware fix like this could be more significant than it seems.
Looking forward: it’s worth keeping an eye on reports from users to see what issues this resolves in practice. If there’s a recurring problem—charging throttling, heat under load, or incompatibility—that seemed persistent before, version 1.4.90 may address it. Also, any future updates should ideally include release notes so users know what’s changing.
