**Steam Client Support Concluding for macOS 11 Big Sur**
If you are on a Mac still running macOS 11 Big Sur, it’s essential to be aware that Valve has declared the Steam Client will stop working on these systems starting October 15. This action is due to compatibility challenges linked to Chromium, which is vital for the Steam Client’s functionality.
### Support Will Conclude on October 15
As mentioned in a blog post by a Reddit user, Valve has verified that the Steam Client will discontinue support for macOS 11 Big Sur after October 15. The company stated that this modification is necessary because fundamental features of Steam rely on an embedded version of Google Chrome, which does not work with older macOS versions. Furthermore, future updates to Steam will necessitate features and security improvements only available in macOS 12 and beyond.
For those who have not upgraded their Macs, whether due to compliance issues or older hardware, it is vital to realize that you will be unable to access Steam or any games acquired through the platform unless you update to a more recent macOS version.
Valve has also pointed out that Apple stopped security updates and technical support for macOS 11 in 2023. This absence of updates creates significant security threats, as systems using outdated software are susceptible to malware and other exploits. Such vulnerabilities can result in performance complications with your computer, Steam, and games, as well as possible theft of your Steam account information.
### Recommendation to Upgrade
Valve strongly encourages all macOS 11 users to promptly upgrade their operating systems. The dangers related to operating outdated software are considerable, particularly when online. Malware can take advantage of these weaknesses, leading to severe repercussions for users.
### Shift to Apple Silicon
This announcement comes alongside Valve’s initiatives to convert Steam for Mac into a native Apple Silicon application, in light of the discontinuation of Rosetta 2. The company has already rolled out a beta version of the native app, which was revealed shortly after WWDC25.
In summary, if you are still utilizing macOS 11 Big Sur, it is crucial to contemplate upgrading your operating system to ensure ongoing access to Steam and to uphold the security and performance of your Mac.
