---
title: Javascript-SDK - 1.4.1
slug: feature-experimentation/release-notes/javascript-sdk-1-4-1
createdAt: 2026-07-20T15:45:27.013Z
---

- Switched to karma/browserstack for cross-browser testing
- Removed es6-promise
- Bump optimizely-server-sdk to version 1.3.1, which includes:
  - Minor performance improvements.

[https://github.com/optimizely/javascript-sdk/releases/tag/v1.4.1](https://github.com/optimizely/javascript-sdk/releases/tag/v1.4.1)