Overview
User might see M1 and M2 Mac not running or seeing configuration error. As part of CircleCI's ongoing infrastructure improvements, Mac M1 and M2 resource classes will be deprecated on February 16, 2026. After this date, these resource classes will no longer be available, and all macOS jobs must use the newer M4 Pro resource classes.
Key Communication Dates
| Event | Date |
|---|---|
| First customer notification sent | October 23, 2025 |
| Free plan default changed to M4 | November 10, 2025 |
| Paid plan default changed to M4 | December 3, 2025 |
| Brownout periods (24-hour) | Ongoing through Feb 2026 |
| Final Deprecation (EOL) | February 16, 2026 |
Update Your Configuration
Replace M1/M2 resource classes with M4 Pro resource classes in your .circleci/config.yml:
Before (M1/M2):
jobs:
build:
macos:
xcode: 16.4.0
resource_class: macos.m1.medium.gen1 # or m2pro.mediumAfter (M1/M2):
jobs:
build:
macos:
xcode: 16.4.0
resource_class: m4pro.medium # or m4pro.largeXcode 16.2.0 was deprecated from M4 Pro on January 14, 2026 per CircleCI's Xcode retention policy, but remains available on M1/M2 until those resource classes are deprecated. For the most current list, see: Supported Xcode Versions Documentation
Brownout Schedule
CircleCI is performing 24-hour brownouts (00:00:01 to 23:59:59 UTC) during which M1/M2 resources will be unavailable. This helps teams identify and migrate workloads before the final deprecation. This can be checked on https://status.circleci.com page.
⚠️ Important: Opting out of brownouts does not extend the final deprecation date. Access to M1/M2 resources will be entirely removed on February 16, 2026, regardless of brownout settings.
Frequently Asked Questions
Q: What happens if I don't migrate by February 16, 2026? A: Jobs specifying M1 or M2 resource classes will fail with a configuration error.
Q: What if I don't specify a resource class? A: If no resource class is specified, jobs will automatically use m4pro.medium(the new default).
Q: Are there any Xcode versions only available on M1/M2? A: Some older Xcode versions may only be available on M1/M2. After February 16, 2026, those versions will no longer be accessible. Review your Xcode requirements and update to supported versions.
Q: Can I request an extension? A: The February 16, 2026 date is our publicly communicated deadline.
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