# What changed in thulite

> 6 changes in thulite 2 to 3 from its official release notes, upgrade guides and advisories: 2 breaking, 1 security, 1 new APIs and options. Each one cited. Sources checked 2026-10-27. HTML: https://unstale.sh/npm/thulite/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## thulite 3

### Breaking changes

- Dart Sass is now required for CSS compilation; developers need to install it in their environment. (3.0.0) — [release notes](https://github.com/thuliteio/thulite/releases/tag/v3.0.0)
- LibSass support has been removed; Dart Sass is now required for CSS compilation. (3.0.0) — [upgrade guide](https://github.com/thuliteio/thulite/blob/main/CHANGELOG.md), [release notes](https://github.com/thuliteio/thulite/releases/tag/v3.0.0)

### Behavior and default changes

- A modern CSS reset was introduced for better cross-browser consistency. (3.0.0) — [upgrade guide](https://github.com/thuliteio/thulite/blob/main/CHANGELOG.md)

## thulite 2

### Security

- The release includes a security fix. (2.6.5) — [release notes](https://github.com/thuliteio/thulite/releases/tag/v2.6.5)

### New APIs and options

- A main landmark is added, changing the page's landmark structure. (2.6.4) — [release notes](https://github.com/thuliteio/thulite/releases/tag/v2.6.4)

### Fixes and other changes

- The release includes a Netlify fix. (2.6.5) — [release notes](https://github.com/thuliteio/thulite/releases/tag/v2.6.5)