---
title: Javascript-SDK - 1.3.1
slug: feature-experimentation/release-notes/javascript-sdk-1-3-1
docTags: 
createdAt: 2026-07-20T15:44:58.774Z
---

\* Bump optimizely-server-sdk to version 1.2.1, which includes:
\- Gracefully handle empty traffic allocation ranges.

[https://github.com/optimizely/javascript-sdk/releases/tag/v1.3.1](https://github.com/optimizely/javascript-sdk/releases/tag/v1.3.1)