Check whether the version is 1.0 or higher, whether the project publishes a changelog, whether it announces deprecations before removal, and whether it follows semantic versioning consistently. Stable interfaces keep your upgrade costs low and let you accept security fixes quickly.
Why stability is a security matter
Security fixes arrive as new versions. If upgrading is painful because each release breaks something, teams delay updates and stay on vulnerable versions. A library with predictable releases is easier to keep patched, so stability signals belong in a security-minded selection process.
What semantic versioning promises
The Semantic Versioning 2.0.0 specification says that, given MAJOR.MINOR.PATCH, you increment major for incompatible API changes, minor for backward compatible functionality, and patch for backward compatible bug fixes. It also states:
- Version zero (0.y.z) is for initial development, anything may change at any time, and the public API should not be considered stable.
- Once a version is released, its contents must not be modified; changes go in a new version.
It also says the minor version must be incremented if any public API functionality is marked as deprecated, so a deprecation should show up in a release before anything is removed.
That is the promise. Whether a project keeps it is something you must check, and semver is a convention maintainers choose to follow, not a rule that enforces itself.
Signals to check
| Signal | Good sign | Warning sign |
|---|---|---|
| Version number | 1.0 or higher | Long-lived 0.x with frequent breaking changes |
| Changelog | Clear entries per release, breaking changes marked | None, or only "bug fixes" |
| Deprecations | Announced in a release before removal | Features vanish between versions |
| Release rhythm | Regular, with patch releases for fixes | Rare big-bang releases |
| Supported versions | Documented policy | Unknown |
| Migration notes | Provided for major versions | Absent |
A practical test
Pick two or three past releases and read their notes. Then ask:
- Could you have upgraded in under an hour?
- Did a minor release break compatibility without saying so?
- Were security fixes available on the major version you would use, or only on the newest?
The third question matters. If fixes land only on the latest major, you inherit forced upgrades whenever a flaw is found.
What to do with a less stable library
- Pin exact versions through a lockfile and update deliberately.
- Use a wrapper, so breaking changes are fixed in one place.
- Keep your test suite strong enough to detect behavior changes. See also semantic versioning and npm security.
What semver does not tell you
A patch release can still change behavior in edge cases, and a major release can be tiny. Version numbers describe intent, not safety. Read the changelog and run your tests before merging an update.
Where Safeguard fits
Safeguard's SBOM and dependency scanning, with policies and gates in pull requests, help you apply updates consistently, and autonomous remediation with fix PRs is available but off by default, with every category on Manual. Try the free scan at gold.safeguard.sh/scan.
Quick check
Is a 0.x library unsafe to use?
No, but the specification says its API should not be considered stable. Pin versions and expect breaking changes.
Does a major version bump mean a security risk?
No. It means incompatible API changes. It may well contain security improvements, so read the notes.
Sources
Last reviewed: 19 October 2026.
