v1.7.0-RC
What's New
Kotlin 1.7.0-RC stabilizes the FIR compiler for production use while delivering critical fixes for Gradle builds, Kotlin/Native 32-bit targets, and JavaScript property handling. This release focuses on build reliability and performance, particularly for Android and multiplatform projects, with improved incremental compilation and classpath caching.
Highlights
- FIR compiler removes production-ready warning, advancing next-gen compiler maturity
- Gradle incremental compilation fixes improve build performance for Android projects
- Kotlin/Native 32-bit target support restored with new memory manager
- JavaScript IR backend fixes missing interface property definitions
- Multiplatform build cache optimizations reduce classpath snapshot overhead
- KAPT incremental compilation now works correctly with unit test reruns
Breaking Changes
- New errors in overload resolution for vararg extension methods
- FIR compiler now errors when run on JS/Native configurations or with incompatible plugins
Deprecations
- Contravariant usages of star projected arguments from Java deprecation cycle extended
Recent Releases
All releases →
v2.3.20-RC
Feb 19, 2026
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v2.3.10
Feb 5, 2026
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v2.3.10-RC2
Feb 2, 2026
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v2.3.20-Beta2
Jan 29, 2026
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v2.3.10-RC
Jan 19, 2026
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v2.3.20-Beta1
Jan 8, 2026
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v2.3.0
Dec 16, 2025
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v2.3.0-RC3
Dec 9, 2025
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v2.3.0-RC2
Dec 2, 2025
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v2.3.0-RC
Nov 18, 2025
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v2.3.0-Beta2
Oct 28, 2025
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