Product
Release notes
Versioned notes for every stable release.
Versioned notes for every stable, beta and security release, with migration guidance where it is needed.
- Current
- v4.2.1
- Cadence
- Weekly, Thursdays
- Support
- 18 months per minor
Stable releases
v4.2.1 · 8 Aug 2026
Minor
Multi-region writes GA
Regional write acceptance with last-writer-wins or custom merge functions. No migration required; enable per project.
v4.2.0 · 1 Aug 2026
Minor
Branch-aware analytics
Traces and spend segmented by branch. Existing dashboards continue to work; new branch filters are additive.
v4.1.4 · 24 Jul 2026
Patch
Scheduler rewrite
Cold start median down to 11 ms. Behavioural change: isolates now pre-warm on route registration rather than first request.
v4.1.0 · 26 Jun 2026
Minor
Fail-closed spend caps
Adds a hard-stop budget mode. Deprecates the soft_limit field, which continues to work until v5.0.
Version support
| Version | Released | Security fixes until | Status |
|---|---|---|---|
| v4.2 | Aug 2026 | Feb 2028 | Current |
| v4.1 | Jun 2026 | Dec 2027 | Supported |
| v4.0 | Mar 2026 | Sep 2027 | Supported |
| v3.9 | Nov 2025 | May 2027 | Maintenance |
| v3.8 | Aug 2025 | Feb 2027 | Maintenance |
Upgrade guidance
Before upgrading
- Read the deprecation section
- Run the codemod in a branch
- Check SDK version compatibility
- Verify against a preview deployment
Our commitments
- 12 months notice for breaking changes
- Codemods for every breaking API
- Security patches within 48 hours
- Published CVE disclosures
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