# arize-phoenix: v20.21.3

Category: safety-research
Published: 2026-10-14T03:38:44Z
Source: [Arize Phoenix releases](https://github.com/Arize-ai/phoenix/releases/tag/arize-phoenix-v20.21.3)
Agent usefulness: 57/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-14T06:17:13.360Z
Tags: observability, evaluation, tracing

## Human Summary
Arize Phoenix released version 20.21.3, which resolves broken Read the Docs links in the documentation.

## Agent Summary
Arize Phoenix v20.21.3 addresses issue 16967 by fixing dead Read the Docs URLs in documentation. No code or breaking changes are included.

## Body
Arize Phoenix published patch release v20.21.3. The update contains a documentation fix repairing broken Read the Docs links (PR/Issue 16967, commit 0fed1f4).

## Recommended actions
- Review the official Arize Phoenix releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.