---
title: React-SDK - 2.4.0
slug: feature-experimentation/release-notes/react-sdk-2-4-0
docTags: 
createdAt: 2026-07-20T15:45:29.638Z
---

\## \[2.4.0] - November 2nd, 2020
Upgrade \`@optimizely/optimizely-sdk\` to \[4.4.0]\([https://github.com/optimizely/javascript-sdk/releases/tag/v4.4.0](https://github.com/optimizely/javascript-sdk/releases/tag/v4.4.0)):
\- Added support for upcoming application-controlled introduction of tracking for non-experiment Flag decisions. See \[@optimizely/optimizely-sdk Release 4.4.0]\([https://github.com/optimizely/javascript-sdk/releases/tag/v4.4.0](https://github.com/optimizely/javascript-sdk/releases/tag/v4.4.0)) for more details.

\### New features
\- Add UMD and System build targets, available at \`dist/react-sdk.umd.js\` and \`dist/react-sdk.system.js\`, respectively (\[#80]\([https://github.com/optimizely/react-sdk/pull/80](https://github.com/optimizely/react-sdk/pull/80)))

\### Bug fixes
\- Fix \`logOnlyEventDispatcher\` to conform to \`EventDispatcher\` type from @optimizely/optimizely-sdk (\[#81]\([https://github.com/optimizely/react-sdk/pull/81](https://github.com/optimizely/react-sdk/pull/81)))
\- Change the file extension of the ES module bundle from .mjs to .es.js. Resolves issues using React SDK with Gatsby (\[#82]\([https://github.com/optimizely/react-sdk/pull/82](https://github.com/optimizely/react-sdk/pull/82))).

[https://github.com/optimizely/react-sdk/releases/tag/2.4.0](https://github.com/optimizely/react-sdk/releases/tag/2.4.0)