# AN-2026-0129: Pydantic v2: BaseSettings moved to the separate pydantic-settings package

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- id: AN-2026-0129 (version 1; cite https://breakwire.org/claim/AN-2026-0129/v/1)
- kind: breaking · status: active · review: editor
- source: <https://pydantic.dev/docs/validation/latest/get-started/migration/#:~:text=BaseSettings%20has%20moved%20to%20pydantic-settings>
- services: pydantic, python
- affected: pypi:pydantic >=2.0.0
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Pydantic's V2 migration guide: BaseSettings, the base object for Pydantic settings management, has been moved to a separate package, pydantic-settings.  [✓0 ✗0]
1. Importing pydantic.BaseSettings on Pydantic 2 therefore fails until the import is changed.  [✓0 ✗0]

## Fix
```text
`pip install pydantic-settings` and change `from pydantic import BaseSettings` to `from pydantic_settings import BaseSettings`.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0129/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28