---
description: The Workers Builds build image has been updated with newer default versions of its runtimes and package managers. You can pin a specific version with an environment variable or version file.
title: Workers Builds now uses newer versions of Node.js, Python, Go, Bun, and more
image: https://developers.cloudflare.com/changelog/post/2026-10-14-workers-builds-default-tooling/og.png?v=ff59e3bb740fa62c
---

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October 14, 2026

## Workers Builds now uses newer versions of Node.js, Python, Go, Bun, and more

[Workers](https://developers.cloudflare.com/workers/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-10-14-workers-builds-default-tooling/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

Your builds now run on newer versions of Node.js, Python, Ruby, Go, Bun, Yarn, and Python package managers by default, so you get the latest fixes and features without changing your build configuration.

#### Runtimes

| Runtime | Previous version | New version | Override with |
| --- | --- | --- | --- |
| Node.js | 24.18.0 | 24.21.0 | `NODE_VERSION` |
| Python | 3.13.3 | 3.14.8 | `PYTHON_VERSION` |
| Ruby | 3.4.7 | 3.4.11 | `RUBY_VERSION` |
| Go | 1.24.3 | 1.27.2 | `GO_VERSION` |

#### Tools and package managers

| Tool | Previous version | New version | Override with |
| --- | --- | --- | --- |
| Bun | 1.2.15 | 1.4.3 | `BUN_VERSION` |
| Yarn | 4.9.1 | 4.18.1 | `YARN_VERSION` |
| pip | 25.1.1 | 26.2.1 | |
| pipx | 1.7.1 | 1.17.2 | |
| Poetry | 2.1.3 | 2.4.3 | |
| uv | 0.7.13 | 0.12.10 | |

Bun 1.4.3 supports both v1 (`bun.lockb`) and v2 (`bun.lock`) lockfiles, so existing Bun projects continue to install without changes.

If your project already sets a version through an environment variable or a version file (such as `.nvmrc`, `.node-version`, `.python-version`, or `.ruby-version`), your builds continue to use that version. To keep using a previous default, add the matching environment variable to your build configuration. For example, set `PYTHON_VERSION` to `3.13.3`.

For more information, refer to [Override default versions](https://developers.cloudflare.com/workers/ci-cd/builds/build-image/#overriding-default-versions) and the [build image policy](https://developers.cloudflare.com/workers/ci-cd/builds/build-image/#build-image-policy).

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