Kotlin v2.3.10 released!

NewsBot · 5 February 2026 13:24

Kotlin v2.3.10 has been released.

Changelog

Compiler

KT-83984 Data races around kotlinx.serialization plugin protobuf extensions registration

KT-83317 ClassCastException: with cast kotlin.UInt to java.lang.Number when defining constant

KT-83031 K2: unstable resolution of EnhancedNullability from type-use NotNull in presence of unused code

KT-81700 flaky overload resolution behaviors (false-positive errors, different final candidates, compile-time failures)

KT-83983 Revert of KT-83081

KT-83314 JSpecify @NullMarked changes Java equals(Object) to equals(Any?) causing override conflict in Kotlin 2.3

KT-82863 @NoInfer regression since 2.2.20

KT-82841 “kotlin.NoWhenBranchMatchedException” in when with !is check & non-sealed class in the middle of hierarchy

JVM. Reflection

KT-83608 Kotlin-reflect: “Unknown origin of public abstract operator fun invoke(p1: P1, p2: P2): R”

KT-83361 “KotlinReflectionInternalError: Type parameter not found: 0” on super types with Kotlin 2.3.0

KT-42199 “KotlinReflectionInternalError: Unknown origin of public abstract operator fun invoke” on function reference to FunctionN.invoke

KT-81024 Reflection: New KType implementation fails on arguments comparison for a Nothing type parameter

Tools. Compiler Plugins

KT-83266 "Unsupported class file major versi…

Link: Release Kotlin 2.3.10 · JetBrains/kotlin · GitHub