> ## Documentation Index
> Fetch the complete documentation index at: https://www.marqeta.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# June 2026 UX Toolkit Release Notes

> Release notes for the UX Toolkit: new features, enhancements, fixed issues, and breaking changes in each version.

To follow new UX Toolkit release notes with RSS, subscribe to the current release notes feed:

`https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/rss.xml`

**New features**

## Version 1.18.0

**Release date:** 3 June 2026

* Added an Environment dropdown to Studio authenticated mode. You can now select a Production or Sandbox environment when routing API requests.
* Added customer-uploaded translation overrides in the sandbox environment.

**Bug fixes**

## Version 1.18.0

**Release date:** 3 June 2026

* Security enhancements.


## Related topics

- [January 2026 UX Toolkit Release Notes](https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/2026-01.md)
- [March 2026 UX Toolkit Release Notes](https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/2026-03.md)
- [April 2026 UX Toolkit Release Notes](https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/2026-04.md)
- [May 2026 UX Toolkit Release Notes](https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/2026-05.md)
- [July 2026 UX Toolkit Release Notes](https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/2026-07.md)