ST-2026-200 · API versions & compatibility
GitHub REST API calendar version 2026-03-10 becomes available
GitHub released REST API calendar version 2026-03-10 on 12 March 2026 as the first calendar version containing breaking changes, while keeping 2022-11-28 supported and as the default for requests without an explicit version header.
Previous state
The 2022-11-28 REST API calendar version remained the default and GitHub had not yet released the 2026-03-10 breaking-change calendar version.
Current state
REST API calendar version 2026-03-10 is available for integrations that explicitly select it; requests without X-GitHub-Api-Version continue to default to 2022-11-28, which remains supported for at least 24 months from the announcement.
Affected users
Who needs to care
GitHub REST API integrations that explicitly select an API calendar version or need to evaluate the breaking changes in 2026-03-10.
Required response
What to do
Review the documented breaking changes and test integration compatibility before opting into 2026-03-10; no immediate migration is required.
Evidence boundary
What the source does not prove
The source proves availability of REST API version 2026-03-10 and its breaking-change status. It does not retire 2022-11-28, force immediate adoption, or imply that every GitHub Enterprise Server deployment exposed the version on 12 March 2026.
Lifecycle history
Dated event sequence
- REST API version 2026-03-10 announced
GitHub released calendar version 2026-03-10 and documented it as the first calendar version containing breaking changes.
Evidence ledger
First-party sources
- 01GitHub — REST API version 2026-03-10 is now available
Official GitHub changelog · 2026-03-12
Open official source ↗