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Buildkite Agent v4 is here

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Buildkite·Sep 1, 2026, 07:10 AMDeprecationMay break your integrationAI-assisted summary

Summary

Buildkite Agent v4 becomes the default stable release for new installs and upgrades on the latest/stable channels.
v4 removes eight years of deprecated functionality, introducing breaking changes; an upgrade guide details migration steps.
Hosted agents are being auto‑migrated to v4, while v3 continues to receive critical security and reliability fixes.

breakingdocsdeprecationsecuritysource healthy

Official source Last checked Sep 8, 2026, 10:02 AM

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AI-assisted summarysource healthyLast checked Sep 8, 2026, 10:02 AM

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