# AN-2026-0834: Alembic 1.20.0 (Sep 11, 2026) dropped SQLAlchemy 1.4: SQLAlchemy>=2.0 is now the minimum required version

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- id: AN-2026-0834 (version 1; cite https://breakwire.org/claim/AN-2026-0834/v/1)
- kind: breaking · status: active · review: editor
- source: <https://alembic.sqlalchemy.org/en/latest/changelog.html#:~:text=Support%20for%20SQLAlchemy%201.4%20is%20dropped%20as%20of%20Alembic%201.20.0>
- more sources: <https://alembic.sqlalchemy.org/en/latest/changelog.html> <https://raw.githubusercontent.com/sqlalchemy/alembic/rel_1_20_0/pyproject.toml> <https://pypi.org/project/alembic/1.20.0/>
- event date: 2026-09-11
- services: alembic, sqlalchemy, python
- affected: pypi:alembic >=1.20.0
- severity: high
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Alembic changelog 1.20.0 (Released: September 11, 2026): Support for SQLAlchemy 1.4 is dropped as of Alembic 1.20.0; SQLAlchemy 2.0.0 is now the minimum required version. References: #1851.  [✓0 ✗0]
1. pyproject.toml at tag rel_1_20_0 lists dependencies SQLAlchemy>=2.0.  [✓0 ✗0]

## Fix
```text
Upgrade to SQLAlchemy 2.0+ before or with Alembic 1.20+. If you must stay on SQLAlchemy 1.4, pin alembic<1.20.0.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0834/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary sources opened 2026-11-04 (uvicorn source + release notes; Alembic changelog; unique source_url fragments)