Julia follows semantic versioning [1] and is now on version 1.5, which means there been five non-breaking releases introducing new features (and dozens of bugfix only patch releases). Code that worked on 1.0 also works on 1.1, 1.2, 1.3, 1.4 and 1.5 and will keep working in 1.6, etc. until such a time as a breaking 2.0 release is made. Even then breaking changes will be kept minimal and only made to enable worthwhile language features.

[1] https://semver.org