A new repository for Scala nightlies

"As a result of a number of features to be delivered in Scala 3.8, chief among them the standard library built with Scala 3, the size of the average Scala 3 release has increased considerably. Based on that fact, we have decided it is no longer suitable to publish them to Maven Central alongside stable releases, and a dedicated hosting space should be used instead."

"Under the hood, it is only Scala 3 nightlies which are now published to a new repository. They used to be published to Maven Central until 3.8.0-RC1-bin-20250822-658c8bd-NIGHTLY (or until the 23rd of August, 2025). All versions that followed have been published to https://repo.scala-lang.org/. Versions from before the change are still available on https://repo.scala-lang.org/, which also serves as a proxy to Maven Central."

"Scala 2 nightlies have been published to a dedicated repository for a long time and this, in fact, did not and likely will not change. The new repository does, however, serve as a proxy to the Scala 2 nightly repository, so from a user's perspective, everything is in one place now. If you want to try out Scala nightly versions, it is now advised to use https://repo.scala-lang.org/, regardless whether you are interested in Scala 3 Next, Scala 3.3 LTS, Scala 2.13 or Scala 2.12."

Nightly Scala versions are hosted at https://repo.scala-lang.org/, with both Scala 2 and Scala 3 nightlies available there. Scala 3 nightlies moved off Maven Central because features in Scala 3.8, notably the standard library built with Scala 3, increased release sizes. Only Scala 3 nightlies are published to the new repository; they were on Maven Central until 3.8.0-RC1-bin-20250822-658c8bd-NIGHTLY (23 August 2025). All subsequent versions are published to https://repo.scala-lang.org/, and earlier versions remain available there, which also proxies Maven Central. At the time of writing, only Scala 3.8 nightlies are published directly; backporting to Scala 3.3 LTS is planned. The new repository proxies the Scala 2 nightly repository.

Read at Scala-lang