# What changed in itty-router

> 2 changes in itty-router 5 from its official release notes, upgrade guides and advisories. Each one cited. Sources checked 2026-10-19. HTML: https://unstale.sh/npm/itty-router/

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

## itty-router 5

### Fixes and other changes

- Greedy params like /a/:b+ no longer reject /a while accepting /a/. (5.0.24) — [release notes](https://github.com/kwhitley/itty-router/releases/tag/v5.0.24)
- cors/corsify no longer throws an immutable headers error in an edge case. (5.0.23) — [release notes](https://github.com/kwhitley/itty-router/releases/tag/v5.0.23)