php changedcli-sdks-libraries/sdks/php
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235235## Semantic versioning
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237Each major version of this SDK sends one API version in the `anthropic-version` header by default, and a new major version comes with each new API version. The first major version that sends `2026-10-21` is 1.0.0; see [Upgrade to 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21#upgrade).
237Each major version of this SDK sends one API version by default, and a new major version comes with each new API version. The first major version that sends `2026-10-21` is 1.0.0; see [Switch to 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21#upgrade).
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239239This package follows [SemVer](https://semver.org/spec/v2.0.0.html) conventions.
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