---
title: React-SDK - 4.2.0
slug: feature-experimentation/release-notes/react-sdk-4-2-0
docTags: 
createdAt: 2026-10-04T12:21:30.000Z
---

## \[4.2.0] - September 3, 2026

### New Features

**Holdout Targeted Delivery Exclusion**: Holdouts can now be configured to exclude Targeted Delivery rules, so users held out of experiments still receive their Targeted Delivery experiences. This gives you a cleaner measure of experiment impact without holding users back from ongoing rollouts.

- Add holdout exclusion logic for Targeted Delivery rules.

[https://github.com/optimizely/react-sdk/releases/tag/4.2.0](https://github.com/optimizely/react-sdk/releases/tag/4.2.0)