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Backward compatibility: (v4.3)

1) Versioning & backward compatibility

Since version 2, the pac4j project has adopted the semver versioning, to make things clearer.

Given a version X.Y.Z:

Generally, pac4j implementations will adopt the semver versioning when upgrading to pac4j version 2, if they don’t already have.

Notice that, while pac4j-* modules are backward compatible, you should always add the pac4j-core dependency in the same version as the upgraded pac4j-* dependency.

2) Maintenance

Generally, only one stable and released stream of pac4j is maintained at the same time, currently, it’s version 4.