Language Briefing — Kotlin 2.0 Ships the K2 Compiler

Executive briefing: JetBrains released Kotlin 2.0 on 21 May 2024, completing the multi-year K2 compiler rewrite and stabilising multiplatform tooling.

Feature highlights

• K2 compiler GA. Faster analysis, improved diagnostics, and better IDE performance land across JVM, Android, and multiplatform projects.
• Kotlin Multiplatform stable. Shared business logic across Android, iOS, desktop, and web now carries a stable API guarantee.
• Compose Multiplatform advances. New Material 3 widgets and navigation APIs simplify shared UI development.
• Tooling updates. Gradle plugin changes, new language warnings, and compiler flags require CI upgrades.

Adoption steps

• Upgrade build scripts to the Kotlin 2.0 Gradle plugin and verify CI caches to capture K2 compiler improvements.
• Audit multiplatform modules for newly stable APIs and align dependency versions across mobile and desktop targets.
• Coordinate with design system teams to plan Compose Multiplatform adoption and regression testing.

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