Scala Compatibility
Policy
- Scala 3 artifacts are built against the current Scala 3 LTS line (currently 3.9.x).
- Scala 2.13 artifacts are cross-published and built with the latest Scala 2.13 patch release.
Compatibility Table
The table shows the Scala version each release was built with. For Scala 3 this is the minimum compiler version your project needs. For Scala 2.13 use the listed patch version or a newer one.
| Version | Scala 2 | Scala 3 |
|---|---|---|
| 3.3.6 and later | 2.13.18 | 3.9.0 |
| 3.3.1 - 3.3.5 | 2.13.18 | 3.10.0 |
| 3.3.0 | 2.13.18 | 3.9.0 |
| 3.2.0 - 3.2.4 | 2.13.18 | 3.8.4 |
| 3.1.0 - 3.1.1 | 2.13.18 | 3.8.3 |
| 3.0.12 | 2.13.17 | 3.7.2 |
| 3.0.8 - 3.0.11 | 2.13.16 | 3.7.2 |
| 3.0.4 - 3.0.7 | 2.13.16 | 3.7.0 |
| 3.0.2 - 3.0.3 | 2.13.16 | 3.6.4 |
| 3.0.0 - 3.0.1 | 2.13.16 | 3.6.0 |
Versions before 3.0.0 have no Scala 3 support.
Why we went back from Scala 3.10 to 3.9
Scala 3 is backward compatible, but not forward compatible: a library compiled with Scala 3.x can only be used by projects that compile with Scala 3.x or newer.
The releases 3.3.1 to 3.3.5 were built with Scala 3.10.0, a Scala Next release. Projects on the Scala 3.9 LTS line could not use these releases.
Scala 2
Scala 2 has no LTS line. Scala 2.13 is binary compatible across all 2.13.x patch releases, so we follow the latest 2.13 patch release.