# What changed in @fastify/compress

> 3 changes in @fastify/compress 9 from its official release notes, upgrade guides and advisories. Each one cited. Sources checked 2026-10-19. HTML: https://unstale.sh/npm/@fastify/compress/

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

## @fastify/compress 9

### Performance

- Small buffered payloads are compressed synchronously, improving compression performance. (9.2.0) — [release notes](https://github.com/fastify/fastify-compress/releases/tag/v9.2.0)

### Fixes and other changes

- Normalizes Vary header handling to prevent duplicate or omitted accept-encoding. (9.2.2) — [release notes](https://github.com/fastify/fastify-compress/releases/tag/v9.2.2)
- Fetch responses are unwrapped before the noCompress check, supporting SSE. (9.2.0) — [release notes](https://github.com/fastify/fastify-compress/releases/tag/v9.2.0)