# Langfuse v4.45.3

Category: safety-research
Published: 2026-09-25T09:19:59Z
Source: [Langfuse releases](https://github.com/langfuse/langfuse/releases/tag/v4.45.3)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-25T12:17:41.920Z
Tags: observability, tracing, evaluation

## Human Summary
Langfuse releases published Langfuse v4.45.3. What's Changed chore(deps): bump image-size to 2.0.4 by @github-actions bot in 17917 fix(web): log the public key when an API key lookup fails by @benlangfeld in 16375 fix(llm-connections): reject TypeSafe base URLs that end in /systemone or have a query string by @DavidTraina in 17901 fix(llm-connections): keep…

## Agent Summary
Treat Langfuse v4.45.3 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
Langfuse releases published Langfuse v4.45.3. This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: What's Changed chore(deps): bump image-size to 2.0.4 by @github-actions bot in 17917 fix(web): log the public key when an API key lookup fails by @benlangfeld in 16375 fix(llm-connections): reject TypeSafe base URLs that end in /systemone or have a query string by @DavidTraina in 17901 fix(llm-connections): keep the custom TypeSafe base URL when switching upstreams by @DavidTraina in 17904 fix(evals): keep the current decision model selectable by @DavidTraina in 17905 fix(evals): list each decision model once when a custom model matches a default by @DavidTraina in 17915 New Contributors @benlangfeld made their first contribution in 16375 Full Changelog : v4.45.2...v4.45.3

## Recommended actions
- Review the official Langfuse 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.