Listen to this Post
Steam Says Goodbye to macOS Big Sur:
If you’re still using macOS 11 Big Sur, it’s time to consider an urgent upgrade. Valve, the company behind Steam, has officially announced that support for macOS Big Sur will end on October 15, 2025. This decision will render the Steam Client unusable on these older Macs — meaning you won’t be able to launch your Steam games unless you update your system.
The reason? Chromium, the core browser engine that Steam embeds for many of its features, no longer works with macOS 11. Since Steam relies heavily on Chromium for functionality, the platform can’t maintain compatibility with Big Sur anymore.
Valve explained that future Steam updates will require macOS 12 Monterey or newer, as essential features and security frameworks are only available on these later versions. If your Mac is stuck on Big Sur, whether because of outdated hardware or work restrictions, you’ll be locked out of Steam completely after the cutoff date.
Beyond functionality, there are serious security concerns too. Apple stopped releasing updates for Big Sur back in 2023. Without patches, Big Sur users are vulnerable to malware, exploits, and performance issues — which could lead to crashes, compromised Steam credentials, and more.
This move is also part of Valve’s broader push to support Apple Silicon Macs natively. Following the deprecation of Rosetta 2, Valve released its first native beta version of Steam for Apple Silicon right after WWDC 2025. This transition signifies a major upgrade in performance and efficiency, especially for newer Macs.
So, if
🧠 What Undercode Say:
A Shift in Platform Priorities
Valve’s decision to sunset support for macOS 11 Big Sur signals a larger industry trend: software vendors are moving faster than ever to drop support for legacy systems. Big Sur, once a celebrated macOS release, is now considered obsolete in terms of performance, security, and compatibility.
The Real Cause: Chromium Incompatibility
The embedded version of Google Chromium, used internally by Steam for various in-app services like the Store, Chat, and Browser, can no longer run properly on macOS 11. Without Chromium, Steam can’t render its interface, manage content, or process user activity — essentially making the app useless on outdated systems.
Why Apple Silicon Matters
Apple’s transition to ARM-based Apple Silicon has forced a massive shift in how apps are developed and maintained. Valve embracing Apple Silicon with a native version of Steam is not just a technical upgrade — it’s a strategic alignment with Apple’s hardware future. Rosetta 2, which previously allowed Intel apps to run on M1/M2 Macs, is being phased out. Native support ensures faster loading times, better energy efficiency, and smoother gaming experiences.
Risks for Sticking with Big Sur
Users who haven’t upgraded since Big Sur are not only losing out on features but are also exposing themselves to:
Zero-day vulnerabilities with no patches from Apple
Potential malware attacks that can corrupt Steam files or compromise accounts
Degraded performance due to lack of optimization in newer app versions
Valve is clearly urging users to upgrade not just for access — but for their own safety.
Broader Impact on Gamers
This move also impacts indie game developers and gamers who rely on older Macs to test or run lightweight titles. Their workflow will be disrupted, potentially forcing them to invest in newer hardware. While this is good for Apple’s ecosystem, it creates friction for users in budget-constrained situations.
✅ Fact Checker Results:
✅ Steam will officially end macOS Big Sur support on October 15, 2025
✅ Steam relies on Chromium, which is now incompatible with macOS 11
✅ macOS Big Sur no longer receives security updates since 2023
🔮 Prediction:
Steam’s transition to fully support only newer macOS versions and Apple Silicon signals a future where app ecosystems will become increasingly exclusive to modern hardware. Expect more gaming platforms, software vendors, and cloud services to follow suit — dropping older OS versions faster to maintain security, efficiency, and innovation. By 2026, it’s likely that even macOS 12 Monterey will start seeing signs of limited support from major software platforms.
🕵️📝✔️Let’s dive deep and fact‑check.
References:
Reported By: 9to5mac.com
Extra Source Hub:
https://www.digitaltrends.com
Wikipedia
OpenAi & Undercode AI
Image Source:
Unsplash
Undercode AI DI v2
🔐JOIN OUR CYBER WORLD [ CVE News • HackMonitor • UndercodeNews ]
📢 Follow UndercodeNews & Stay Tuned:
𝕏 formerly Twitter 🐦 | @ Threads | 🔗 Linkedin | 🦋BlueSky | 🐘Mastodon
