JetBrains/kotlin
JetBrains/kotlin
Activity
Last release
Open issues
Open PRs
License
release notes
release notes
Published 1/19/2026
Pre-ReleasePre-releaseKT-83314 JSpecify [@NullMarked](https://github.com/NullMarked) changes Java equals(Object) to equals(Any?) causing override conflict in Kotlin 2.3KT-83317 ClassCastException: with cast kotlin.UInt to java.lang.Number when defining constantKT-83031 K2: unstable resolution of EnhancedNullability from type-use NotNull in presence of unused codeKT-82863 [@NoInfer](https://github.com/NoInfer) regression since 2.2.20KT-82841 "kotlin.NoWhenBranchMatchedException" in when with !is check & non-sealed class in the middle of hierarchyb/195200551 Fix classId for detecting protobuf enumsb/463961757 Simplify Compose group analysisb/463961757 Fix analysis of boolean captures in composable lambdab/461766771 Fix IrSimpleFunction.isLegacyOpenFunctionWithDefaultKT-83608 Kotlin-reflect: "Unknown origin of public abstract operator fun invoke(p1: P1, p2: P2): R"KT-42199 "KotlinReflectionInternalError: Unknown origin of public abstract operator fun invoke" on function reference to FunctionN.invokeKT-81024 Reflection: New KType implementation fails on arguments comparison for a Nothing type parameterKT-83361 "KotlinReflectionInternalError: Type parameter not found: 0" on super types with Kotlin 2.3.0KT-83266 "Unsupported class file major version 69" for "produceReleaseComposeMapping" task with Kotlin 2.3KT-83099 Compose compiler does not generate stack trace mappings for project filesKT-83070 The KGP api reference is missing a descriptionKT-82459 Improve iOS simulator boot implementationKT-82946 Js, Wasm: Upgrade NPM dependenciesKT-83687 Revert deprecation of 'androidTarget' for AGP lower than 9release notes
Published 1/19/2026
Pre-ReleasePre-releaseKT-83314 JSpecify [@NullMarked](https://github.com/NullMarked) changes Java equals(Object) to equals(Any?) causing override conflict in Kotlin 2.3KT-83317 ClassCastException: with cast kotlin.UInt to java.lang.Number when defining constantKT-83031 K2: unstable resolution of EnhancedNullability from type-use NotNull in presence of unused codeKT-82863 [@NoInfer](https://github.com/NoInfer) regression since 2.2.20KT-82841 "kotlin.NoWhenBranchMatchedException" in when with !is check & non-sealed class in the middle of hierarchyb/195200551 Fix classId for detecting protobuf enumsb/463961757 Simplify Compose group analysisb/463961757 Fix analysis of boolean captures in composable lambdab/461766771 Fix IrSimpleFunction.isLegacyOpenFunctionWithDefaultKT-83608 Kotlin-reflect: "Unknown origin of public abstract operator fun invoke(p1: P1, p2: P2): R"KT-42199 "KotlinReflectionInternalError: Unknown origin of public abstract operator fun invoke" on function reference to FunctionN.invokeKT-81024 Reflection: New KType implementation fails on arguments comparison for a Nothing type parameterKT-83361 "KotlinReflectionInternalError: Type parameter not found: 0" on super types with Kotlin 2.3.0KT-83266 "Unsupported class file major version 69" for "produceReleaseComposeMapping" task with Kotlin 2.3KT-83099 Compose compiler does not generate stack trace mappings for project filesKT-83070 The KGP api reference is missing a descriptionKT-82459 Improve iOS simulator boot implementationKT-82946 Js, Wasm: Upgrade NPM dependenciesKT-83687 Revert deprecation of 'androidTarget' for AGP lower than 9The Kotlin Programming Language.