Apple Releases Firmware Update for 140W USB-C Power Adapter

What Could This Firmware Update Fix?

Apple released a firmware update for its 140W USB-C Power Adapter on September 8, 2026. The update, labeled version 1.4.90, became available automatically to users. No official release notes accompanied the update, leaving the specific changes undisclosed. Apple typically pushes such updates silently through connected devices.

The 140W USB-C Power Adapter is designed for fast charging of MacBook Pro models and other high-power devices. Firmware updates for power adapters are rare but not unprecedented, often addressing efficiency, thermal management, or communication protocols. This particular adapter uses intelligent power distribution and requires periodic software maintenance to ensure compatibility with evolving Apple hardware. The silent installation process means users may not notice the update unless they check system logs or device information.

Is This Update Necessary for All Users?

While Apple has not detailed the contents of version 1.4.90, industry analysts speculate it may improve power delivery stability or resolve minor communication glitches between the adapter and MacBook Pro. Previous firmware updates for similar accessories have focused on enhancing safety protocols and reducing energy loss during idle states. Without public changelogs, users rely on Apple’s internal testing to ensure reliability and performance. The update likely targets background operations that are not visible to end users but critical for long-term device health.

Apple recommends keeping all device firmware current, especially for accessories that manage high electrical loads. Although no issues have been reported with the current adapter firmware, preventive updates help avoid potential compatibility problems with future macOS versions. Users who frequently charge multiple devices or use the adapter in demanding environments may benefit most from the silent upgrade. The lack of user intervention simplifies maintenance but reduces transparency about what is being changed.

How do I know if the firmware update installed? The update installs automatically when the adapter is connected to a Mac. Users can check the firmware version in System Settings under General > About > System Report > Power.

Frequently Asked Questions

Why doesn’t Apple share release notes for adapter firmware? Apple often omits detailed notes for low-level firmware updates, considering them routine maintenance rather than feature changes, to avoid confusing users with technical details.

Can I manually trigger the firmware update? No, the update process is fully automatic and cannot be initiated manually by the user. It occurs in the background when the adapter is in use.