During its Platforms State of the Union segment at WWDC 2025, Apple revealed that macOS 26 Tahoe is the final major macOS version for Intel-based Macs.
The upcoming macOS 27 release will be compatible with Apple silicon Macs only, meaning that you will need a Mac with an M-series chip or a MacBook Neo with an A18 Pro chip in order to install the software update. macOS 27 should be available...