# What changed in react-syntax-highlighter

> 3 changes in react-syntax-highlighter 16 from its official release notes, upgrade guides and advisories: 1 breaking. Each one cited. Sources checked 2026-10-18. HTML: https://unstale.sh/npm/react-syntax-highlighter/

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

## react-syntax-highlighter 16

### Breaking changes

- The major version update remedies security issues but could result in a breaking change to your app's dependencies; update with care. (16.0.0) — [release notes](https://github.com/react-syntax-highlighter/react-syntax-highlighter/releases/tag/v16.0.0)

### Fixes and other changes

- Fixed ESM imports still missing the .js extension when using highlight.js. (16.1.2) — [release notes](https://github.com/react-syntax-highlighter/react-syntax-highlighter/releases/tag/v16.1.2)
- Fixed missing .js extensions in ESM imports. (16.1.1) — [release notes](https://github.com/react-syntax-highlighter/react-syntax-highlighter/releases/tag/v16.1.1)