If you're a technical writer, software engineer, or just closely related to the IT world, you would've heard of semantic versioning. Sometimes referred to as SemVer, it's a convention used to highlight the kind of changes included in a release. At a very high level, a semantic version includes a three-part number. The first number denotes the major version, the second denotes the minor version, and the last one denotes the patch version.
A major version is huge upgrade over it's predecessor. It includes breaking changes, new features, architectural improvements, and more.
1.0 -> 2.0
A minor version is often released for new features that don't break any of the existing functionality of the software.
1.1 -> 1.2
A patch version is often released as a hotfix to fix bugs. This also doesn't break any of the existing functionality already present in the software.
1.1 -> 1.1.1
Just knowing about these versions is not enough. There are also a wide range of common conventions that come along with it.
A breaking change always requires a major version increment.
If you've released a version, you cannot modify it.
If you've alpha or beta software, you can indicate them using a hyphen like 1.0.0-alpha.
package.jsonSemantic versioning is integral to package managers like npm, which leverage version constraints to manage dependency updates. The caret operator (^) allows patch and minor version updates while pinning the major version:
"dependencies": {
"library": "^1.2.3"
}
This constraint permits installations of versions >=1.2.3 and <2.0.0, ensuring backward compatibility while capturing bug fixes and new features. The tilde operator (~), by contrast, restricts updates to patch versions only:
"dependencies": {
"library": "~1.2.3"
}
This permits versions >=1.2.3 and <1.3.0. Exact pinning (for example, "1.2.3") eliminates version flexibility entirely, useful for critical dependencies where stability is prioritized over updates.
Understanding these constraints is essential for maintaining secure and compatible dependency trees, as caret versioning implicitly trusts that library maintainers adhere to semantic versioning standards.
Semantic versioning helps provide a predictable and disciplined release cycle. Consumers of the dependency or package immediately know from the version itself whether it's an easy upgrade or contains any risks. When combined with appropriate version constraints in dependency managers, SemVer enables automated, safe dependency updates while minimizing breaking change exposure.