CircleCI incident: Build failures Xcode 26.4.0

Affected components

• macOS Jobs

1. resolvedApr 24, 2026, 18:36 UTC

   Customers running macOS jobs on m4pro.medium and m4pro.large with the xcode:26.4.0 image experienced job rejections with the error: "Job was rejected because resource class <class name>, image xcode:26.4.0 is not a valid resource class". The issue has been resolved and affected jobs should now run normally. Customers whose jobs failed may rerun affected jobs. We thank you for your patience while our team worked on implementing a fix.

2. monitoringApr 24, 2026, 18:01 UTC

   A fix has been implemented and we are monitoring the results.

3. identifiedApr 24, 2026, 17:25 UTC

   There are build failures for Xcode 26.4.0; we have identified the issue and are currently implementing a fix.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in CircleCI's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

• OneSignal: [Dashboard & API] - [elevated error rates]Major · Apr 24, 2026, 18:25 UTC
• Snyk: Snyk recurring tests showing slow performanceMinor · Apr 21, 2026, 18:58 UTC
• Inngest: Degraded performance for REST API (runs/events data)Minor · Apr 23, 2026, 20:06 UTC

How often does CircleCI have incidents?

CircleCI reported 22 incidents in the last 90 days, 1 of them major or critical. A typical incident lasted 1h 38m. See CircleCI's uptime and incident history