# What changed in @smithy/signature-v4

> 4 changes in @smithy/signature-v4 5 from its official release notes, upgrade guides and advisories: 1 new APIs and options. Each one cited. Sources checked 2026-10-22. HTML: https://unstale.sh/npm/@smithy/signature-v4/

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

## @smithy/signature-v4 5

### New APIs and options

- Credentials can now be snapshotted for event-stream signing. (5.3.14) — [release notes](https://github.com/smithy-lang/smithy-typescript/releases/tag/%40smithy/signature-v4%405.3.14)

### Fixes and other changes

- Non-ASCII whitespace is now preserved in canonical headers. (5.7.4) — [release notes](https://github.com/smithy-lang/smithy-typescript/releases/tag/%40smithy/signature-v4%405.7.4)
- Type updates support projects configured with isolatedModules=true. (5.6.3) — [release notes](https://github.com/smithy-lang/smithy-typescript/releases/tag/%40smithy/signature-v4%405.6.3)
- The exported API surface was cleaned up; the notes do not specify which exports changed. (5.4.0) — [release notes](https://github.com/smithy-lang/smithy-typescript/releases/tag/%40smithy/signature-v4%405.4.0)