Semantic Versioning

What Is Semantic Versioning?

Semantic versioning, or SemVer, is a software versioning convention that uses a three-part number to show whether a release breaks compatibility, adds compatible features, or fixes bugs. It helps developers assess upgrade risk for libraries, APIs, services, and applications based on user-visible changes rather than code volume.

How the MAJOR.MINOR.PATCH Format Works

A version such as 2.4.1 communicates three kinds of release changes.

How to Choose the Next Semantic Version

1. Identify the public contract, including documented API endpoints, package functions, configuration, or command-line behavior.
2. Check whether existing integrations and user flows still work as promised.
3. Use MAJOR for breaking changes, MINOR for compatible additions, and PATCH for compatible fixes.
4. Reset lower numbers to zero after increasing MAJOR or MINOR.
5. Tag the tested release and publish clear release notes.

Internal refactoring does not require a major version when observable behavior and supported interfaces remain compatible.

Prerelease Versions, Build Metadata, and Version Order

A prerelease label marks software that is not yet stable, such as 1.5.0-alpha.1, 1.5.0-beta.1, or 1.5.0-rc.1. Prereleases rank lower than the related stable version, so 1.5.0-rc.1 comes before 1.5.0. Build metadata, such as 1.5.0+build.42, identifies a build but does not change version order.

Does Semantic Versioning Start at 0 or 1?

SemVer permits 0.y.z during initial development, when a public interface may change quickly. Reaching 1.0.0 usually signals a stable public API and deliberate compatibility commitments.

Benefits of Semantic Versioning

• It gives dependency users a quick compatibility signal before upgrading.
• It supports safer package-manager version ranges and release planning.
• It makes release notes more accountable because the number must match the change.
• It separates new functionality from urgent fixes.

Practical Limits of Semantic Versioning

SemVer is a communication system, not a guarantee that an upgrade is safe.

• It fails when a team has not defined its supported interfaces.
• Changing defaults, permissions, performance, or security requirements can still disrupt users.
• Misclassified releases create false confidence and dependency problems.
• Testing, migration guidance, and release notes remain necessary.

Semantic Versioning for APIs and App Releases

Applications can use SemVer for internal releases, but public services also need a clear API versioning and deprecation policy. Removing an API field may warrant a major release, but users still need notice, a migration path, and time to update. This discipline fits structured app design and development.

Using Semantic Versioning with Emergent

Teams building with an AI app builder can use SemVer to record user-visible changes as features, integrations, and APIs evolve. Before shipping, test existing flows, document compatibility impacts, and apply consistent version tags so each Emergent release is easier to understand and manage.