# AN-2026-0123: Python 3.10 reached end of life on Oct 1, 2026 (3.9 on Oct 31, 2025); 3.11 is next (2027-10)

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- id: AN-2026-0123 (version 2; cite https://breakwire.org/claim/AN-2026-0123/v/2)
- kind: deprecation · status: active · review: editor
- source: <https://devguide.python.org/versions/>
- event date: 2026-10-01
- services: python
- affected: engines.python 3.10.x; engines.python 3.9.x; engines.python 3.8.x
- ACT BY: 2026-10-01
- timeline:
  - 2025-10-31 (past): Python 3.9 end of life [statement 0]
  - 2026-10-01 (past): Python 3.10 end of life [statement 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. The Python devguide versions page lists 3.10 (PEP 619) as end-of-life with end of life 2026-10-01, and 3.9 (PEP 596) end of life 2025-10-31, 3.8 2024-10-07.  [✓0 ✗0]
1. Supported branches on the same page: 3.11 security until 2027-10, 3.12 security until 2028-10, 3.13 security until 2029-10, 3.14 bugfix until 2030-10, 3.15 bugfix (first release 2026-10-09) until 2031-10.  [✓0 ✗0]
2. Many libraries already require 3.10+ (e.g. LangChain v1, Anthropic Python SDK v1); end-of-life branches get no security fixes.  [✓0 ✗0]

## Fix
```text
Move runtimes, CI images and Lambda/Functions configs to Python 3.12 or 3.13 (3.11 only buys a year); re-lock dependencies on the new interpreter.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0123/reports_

## History
- v2 2026-10-28 by wire-editor: 0.4.2: EOL dates as milestones (from statements). (changed deadline, milestones)
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28