# September 2026 URL: https://www.warpbuild.com/docs/ci/changelog/2026-september Description: List of updates in 2026-September --- title: "September 2026" slug: "2026-September" description: "List of updates in 2026-September" sidebar_position: -33 createdAt: "2026-09-01" updatedAt: "2026-09-29" --- ### September 29, 2026 - `Enhancement`: [Windows Server 2025 image](https://github.com/actions/runner-images/releases/tag/win25%2F20260922.270) has been updated. - `Enhancement`: [Windows Server 2025 with Visual Studio 2026 image](https://github.com/actions/runner-images/releases/tag/win25-vs2026%2F20260922.246) has been updated. - `Enhancement`: [Windows Server 2022 image](https://github.com/actions/runner-images/releases/tag/win22%2F20260920.314) has been updated. - `Enhancement`: [Ubuntu 26.04 Arm64 image](https://github.com/actions/runner-images/releases/tag/ubuntu26-arm64%2F20260920.129) has been updated. - `Enhancement`: [Ubuntu 26.04 image](https://github.com/actions/runner-images/releases/tag/ubuntu26%2F20260920.143) has been updated. - `Enhancement`: [Ubuntu 24.04 Arm64 image](https://github.com/actions/runner-images/releases/tag/ubuntu24-arm64%2F20260920.129) has been updated. - `Enhancement`: [Ubuntu 24.04 image](https://github.com/actions/runner-images/releases/tag/ubuntu24%2F20260920.314) has been updated. - `Enhancement`: [Ubuntu 22.04 image](https://github.com/actions/runner-images/releases/tag/ubuntu22%2F20260920.303) has been updated. ### September 25, 2026 - `Feature`: **Auto-scaling Docker builders (private beta).** A new version of Docker builders that automatically scales out is in private beta. When there is a high concurrency of builds, extra builders that share the profile's cache are automatically spun up. It will be rolled out to everyone soon. [Learn more](/docs/ci/docker-builders). ### September 23, 2026 - `Enhancement`: **Xcode 27.0 on the macOS 26 runners is now the stable release.** `warp-macos-26-arm64-6x` and `warp-macos-26-arm64-12x` now ship Xcode 27.0 build `27A266a` at `/Applications/Xcode_27.0.app`, replacing the earlier beta build (`27A5194q`). `/Applications/Xcode_27.0_Beta.app` still points at it, so workflows that use that path keep working. The default Xcode is unchanged at 26.6, and the bundled simulator runtimes are iOS 27.0 (24A434), tvOS 27.0 (24J360), watchOS 27.0 (24R362) and visionOS 27.0 (24M362). If you select Xcode with `maxim-lobanov/setup-xcode` and `latest-stable`, it now picks Xcode 27.0; set `xcode-version: '26.6'` to stay on Xcode 26. [Learn more](/docs/ci/cloud-runners#macos-26-tooling). ### September 17, 2026 - `Breaking Change`: **macOS runner memory changes on October 1, 2026.** The 6 vCPU macOS runners will have 14GB of memory (down from 22GB) and the 12 vCPU runners will have 28GB (down from 44GB). Prices, vCPU counts, and disk sizes are unchanged. If your jobs rely on more memory than this, move to the 12 vCPU label or contact [support@warpbuild.com](mailto:support@warpbuild.com). See [Runners](/docs/ci/cloud-runners#macos-m4-pro-on-arm64). ### September 9, 2026 - `Enhancement`: **Claude Managed Agents** - When connecting an Anthropic organisation, you can now attach an existing self-hosted environment by pasting its environment ID. Leave it blank to let WarpBuild create one for you. ### September 8, 2026 - `Feature`: **Linux ARM64 runners on Apple Silicon.** Ubuntu 26.04 ARM64 runners that execute as virtual machines on the same M4 Pro hardware as our macOS fleet, using the `-xfast` labels. | Runner Tag | CPU | Memory | Storage | Price | | -------------------------------- | ------- | ------ | --------- | ------------ | | warp-ubuntu-2604-arm64-6x-xfast | 6 vCPU | 14GB | 150GB SSD | $0.08/minute | | warp-ubuntu-2604-arm64-12x-xfast | 12 vCPU | 28GB | 300GB SSD | $0.16/minute | [Learn more](https://www.warpbuild.com/docs/ci/cloud-runners#linux-arm64-on-apple-silicon). ### September 7, 2026 - `Feature`: **Export runner telemetry to your own OTLP backend.** Runner metrics and logs can now be streamed to an observability backend you own, in addition to the WarpBuild dashboards. Configure it under [Observability settings](https://app.warpbuild.com/ci/observability/settings). [Learn more](https://www.warpbuild.com/docs/ci/features/observability#exporting-to-your-own-backend). ### September 6, 2026 - `Enhancement`: [macOS 26 image](https://github.com/actions/runner-images/releases/tag/macos-26-arm64%2F20260728.0273) has been updated. - Xcode 26.6 has been added. - An issue where screen capture in jobs failed or returned an empty image has been fixed. - `Enhancement`: [macOS 15 image](https://github.com/actions/runner-images/releases/tag/macos-15-arm64%2F20260829.0321) has been updated. ### September 4, 2026 - `Enhancement`: [Windows Server 2025 image](https://github.com/actions/runner-images/releases/tag/win25%2F20260830.247) has been updated. - `Enhancement`: [Windows Server 2025 with Visual Studio 2026 image](https://github.com/actions/runner-images/releases/tag/win25-vs2026%2F20260824.214) has been updated. - `Enhancement`: [Windows Server 2022 image](https://github.com/actions/runner-images/releases/tag/win22%2F20260830.290) has been updated. - `Enhancement`: [Ubuntu 26.04 Arm64 image](https://github.com/actions/runner-images/releases/tag/ubuntu26-arm64%2F20260831.111) has been updated. - `Enhancement`: [Ubuntu 26.04 image](https://github.com/actions/runner-images/releases/tag/ubuntu26%2F20260831.124) has been updated. - `Enhancement`: [Ubuntu 24.04 Arm64 image](https://github.com/actions/runner-images/releases/tag/ubuntu24-arm64%2F20260831.111) has been updated. - `Enhancement`: [Ubuntu 24.04 image](https://github.com/actions/runner-images/releases/tag/ubuntu24%2F20260831.293) has been updated. - `Enhancement`: [Ubuntu 22.04 image](https://github.com/actions/runner-images/releases/tag/ubuntu22%2F20260831.284) has been updated. ### September 1, 2026 - `Feature`: **New major versions for the caching and Docker actions.** Each action is synced with its upstream project and rebuilt on ESM, Node 24 and the current `@actions/*` packages. | Action | New version | Previous | | --- | --- | --- | | [`WarpBuilds/cache`](https://github.com/WarpBuilds/cache) | `@v2` | `@v1` | | [`WarpBuilds/setup-node`](https://github.com/WarpBuilds/setup-node) | `@v7` | `@v6` | | [`WarpBuilds/setup-python`](https://github.com/WarpBuilds/setup-python) | `@v7` | `@v6` | | [`WarpBuilds/setup-go`](https://github.com/WarpBuilds/setup-go) | `@v7` | `@v6` | | [`WarpBuilds/setup-java`](https://github.com/WarpBuilds/setup-java) | `@v6` | `@v5` | | [`WarpBuilds/setup-dotnet`](https://github.com/WarpBuilds/setup-dotnet) | `@v6` | `@v4` | | [`Warpbuilds/build-push-action`](https://github.com/WarpBuilds/build-push-action) | `@v7` | `@v6` | | [`Warpbuilds/bake-action`](https://github.com/WarpBuilds/bake-action) | `@v7` | `@v6` | - `Enhancement`: **Clearer cache logs in `WarpBuilds/cache`.** A cache miss no longer reports `Failed to restore`. Server errors now log as errors. The log also separates an exact-key hit from a restore-key hit, so you can tell when a cache came from a prefix match.