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July 3rd, 2026, ISSUE 621

READING

The Scala Library Author's Dilemma

How Sage ended up supporting ZIO, Cats Effect, Kyo, Ox, and Pekko from one codebase, what I tried before, and the tradeoffs I still had to accept.
Pierre Ricadat (@ghostdogpr)
Introducing Deder Build Tool

TLDR: provide minimum number of config options (with good defaults) that get the job done.
Sakib Hadžiavdić (@sake_92)

RELEASES

sbt 2 is now available!

The final official announcement.
Scala Center (@scala_lang)
muntabot 1.0.0

an oral exam (viva) assistant for programming
Bjorn Regnell
Hearth 0.4.0

Hearth 0.4.0 once again is pushing the limits of what you can do with macros (without going insane): - reworked method callers that could let you build every call - expression destructuring enabling quicklens-like patterns - creating anonymous instance of an arbitrary type.
Mateusz Kubuszok (@MateuszKubuszok)
Sage 0.2.0

Released Sage 0.2.0 with new features and improvements. The highlight is a new OpenTelemetry integration which gives you traces for Redis/Valkey commands by adding a single line of code.
Pierre Ricadat (@ghostdogpr)

EVENTS

Scala Days, Oct 12th - 13th, Berlin, Germany

We are very happy to announce that the Scala Days 2026 conference will be taking place 12 - 13 October in Berlin, Germany, one of Europe’s most vibrant tech and open source hubs, known for its strong culture of collaboration and its growing role in advancing digital sovereignty through open technologies.
Scala Days (@scaladays)
J On the Beach, Oct 29th - 30th, Malaga, Spain

A Pure Tech and Fun Conference for All Things Data.
J On The Beach (@JOTBConf)
Lambda World, Oct 29th. - 30th, Malaga, Spain

Experience the sunshine, the code, and the unforgettable vibe that made Lambda World 2025 shine in Málaga.
Lambda World (@lambda_world)

VARIA

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