---
title: JavaScript SDK 0.5.15
summary: null
url: >-
  https://www.fastly.com/documentation/reference/changes/2022/12/javascript-sdk-0.5.15
---

## Added

- add `allowDynamicBackends` function to `fastly:experimental` module ([83a003e](https://github.com/fastly/js-compute-runtime/commit/83a003e17307c01876751686620a6a1effbfaa99))
- upgrade from SpiderMonkey 96 to SpiderMonkey 107 ([#330](https://github.com/fastly/js-compute-runtime/pull/330))