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Bump the kotlin-toolchain group across 1 directory with 5 updates - #25

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Bump the kotlin-toolchain group across 1 directory with 5 updates#25
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@dependabot dependabot Bot commented on behalf of github Oct 12, 2026

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Bumps the kotlin-toolchain group with 5 updates in the / directory:

Package From To
org.jetbrains.kotlin:kotlin-test 2.4.20 2.4.21
org.jetbrains.kotlin.jvm 2.4.20 2.4.21
org.jetbrains.kotlin.multiplatform 2.4.20 2.4.21
org.jetbrains.kotlin.plugin.serialization 2.4.20 2.4.21
org.jetbrains.kotlin.jvm 2.4.20 2.4.21
org.jetbrains.kotlin.multiplatform 2.4.20 2.4.21
com.google.devtools.ksp 2.3.11 2.3.12
org.jetbrains.kotlin.plugin.serialization 2.4.20 2.4.21

Updates org.jetbrains.kotlin:kotlin-test from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin:kotlin-test's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin:kotlin-test's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows
Commits
  • 9180ce6 Add changelog for 2.4.21-RC
  • 851077b [Serialization] Copy type parameter bounds onto generated serializers (#8421)
  • 1b6b624 [Wasm]: Generate a Kotlin-level cast for bridged lambda functions. (#8404)
  • 3c223c2 Rrr/2.4.20/core docs (#8322)
  • c681c2e [2.4.20] [KT-89285] Stop the xcodebuild logs being output by default (#8277)
  • f0645d1 [2.4.20] [JS] Reorder CompilerConfiguration properties initialization (#8282)
  • f507ecd [JS] Don't try to initialize an external class's companion object
  • c60d7d8 Reflection: fix NoSuchElementException in ConvertFromJava.kt
  • 05d1cde REPL: render correct reflected binding type
  • 5acec47 Scripting: store collected dependencies recursively
  • Additional commits viewable in compare view

Updates org.jetbrains.kotlin.jvm from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.jvm's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin.jvm's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows
Commits
  • 9180ce6 Add changelog for 2.4.21-RC
  • 851077b [Serialization] Copy type parameter bounds onto generated serializers (#8421)
  • 1b6b624 [Wasm]: Generate a Kotlin-level cast for bridged lambda functions. (#8404)
  • 3c223c2 Rrr/2.4.20/core docs (#8322)
  • c681c2e [2.4.20] [KT-89285] Stop the xcodebuild logs being output by default (#8277)
  • f0645d1 [2.4.20] [JS] Reorder CompilerConfiguration properties initialization (#8282)
  • f507ecd [JS] Don't try to initialize an external class's companion object
  • c60d7d8 Reflection: fix NoSuchElementException in ConvertFromJava.kt
  • 05d1cde REPL: render correct reflected binding type
  • 5acec47 Scripting: store collected dependencies recursively
  • Additional commits viewable in compare view

Updates org.jetbrains.kotlin.multiplatform from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.multiplatform's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin.multiplatform's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows
Commits
  • 9180ce6 Add changelog for 2.4.21-RC
  • 851077b [Serialization] Copy type parameter bounds onto generated serializers (#8421)
  • 1b6b624 [Wasm]: Generate a Kotlin-level cast for bridged lambda functions. (#8404)
  • 3c223c2 Rrr/2.4.20/core docs (#8322)
  • c681c2e [2.4.20] [KT-89285] Stop the xcodebuild logs being output by default (#8277)
  • f0645d1 [2.4.20] [JS] Reorder CompilerConfiguration properties initialization (#8282)
  • f507ecd [JS] Don't try to initialize an external class's companion object
  • c60d7d8 Reflection: fix NoSuchElementException in ConvertFromJava.kt
  • 05d1cde REPL: render correct reflected binding type
  • 5acec47 Scripting: store collected dependencies recursively
  • Additional commits viewable in compare view

Updates org.jetbrains.kotlin.plugin.serialization from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.plugin.serialization's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin.plugin.serialization's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows
Commits
  • 9180ce6 Add changelog for 2.4.21-RC
  • 851077b [Serialization] Copy type parameter bounds onto generated serializers (#8421)
  • 1b6b624 [Wasm]: Generate a Kotlin-level cast for bridged lambda functions. (#8404)
  • 3c223c2 Rrr/2.4.20/core docs (#8322)
  • c681c2e [2.4.20] [KT-89285] Stop the xcodebuild logs being output by default (#8277)
  • f0645d1 [2.4.20] [JS] Reorder CompilerConfiguration properties initialization (#8282)
  • f507ecd [JS] Don't try to initialize an external class's companion object
  • c60d7d8 Reflection: fix NoSuchElementException in ConvertFromJava.kt
  • 05d1cde REPL: render correct reflected binding type
  • 5acec47 Scripting: store collected dependencies recursively
  • Additional commits viewable in compare view

Updates org.jetbrains.kotlin.jvm from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.jvm's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin.jvm's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows
Commits
  • 9180ce6 Add changelog for 2.4.21-RC
  • 851077b [Serialization] Copy type parameter bounds onto generated serializers (#8421)
  • 1b6b624 [Wasm]: Generate a Kotlin-level cast for bridged lambda functions. (#8404)
  • 3c223c2 Rrr/2.4.20/core docs (#8322)
  • c681c2e [2.4.20] [KT-89285] Stop the xcodebuild logs being output by default (#8277)
  • f0645d1 [2.4.20] [JS] Reorder CompilerConfiguration properties initialization (#8282)
  • f507ecd [JS] Don't try to initialize an external class's companion object
  • c60d7d8 Reflection: fix NoSuchElementException in ConvertFromJava.kt
  • 05d1cde REPL: render correct reflected binding type
  • 5acec47 Scripting: store collected dependencies recursively
  • Additional commits viewable in compare view

Updates org.jetbrains.kotlin.multiplatform from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.multiplatform's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin.multiplatform's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows
Commits
  • 9180ce6 Add changelog for 2.4.21-RC
  • 851077b [Serialization] Copy type parameter bounds onto generated serializers (#8421)
  • 1b6b624 [Wasm]: Generate a Kotlin-level cast for bridged lambda functions. (#8404)
  • 3c223c2 Rrr/2.4.20/core docs (#8322)
  • c681c2e [2.4.20] [KT-89285] Stop the xcodebuild logs being output by default (#8277)
  • f0645d1 [2.4.20] [JS] Reorder CompilerConfiguration properties initialization (#8282)
  • f507ecd [JS] Don't try to initialize an external class's companion object
  • c60d7d8 Reflection: fix NoSuchElementException in ConvertFromJava.kt
  • 05d1cde REPL: render correct reflected binding type
  • 5acec47 Scripting: store collected dependencies recursively
  • Additional commits viewable in compare view

Updates com.google.devtools.ksp from 2.3.11 to 2.3.12

Release notes

Sourced from com.google.devtools.ksp's releases.

2.3.12

What's Changed

Migrating Processors to Support Backing Fields

This release introduces support for explicit backing fields (#2873), which may now be returned by Resolver.getSymbolsWithAnnotation. To prevent breaking existing processors, new language features require an explicit opt-in.

More generally, the KSP API now explicitly models backing fields for properties. The following is an exhaustive list of functions in KSP API where processor may observe the change after opting in:

  • Resolver.getSymbolsWithAnnotation: The function now returns a KSBackingField if the given annotation targeted a field. Previously, if a field were targeted, the function would return a KSProperty.
  • Resolver.effectiveJavaModifiers: The function returns fewer modifiers for a KSPropertyDeclaration if it has a backing field, since most of the JVM-specific annotations apply to the backing field. If you are interested in the JVM modifiers, you should call the function with the KSBackingField obtained from the property instead.

Additionally, KSP now models Java fields as properties that always have backing fields. Some of the modifiers now apply to the backing field instead.

Processors adapting to new features must opt in via both of the following steps simultaneously (failing to do both may lead to undefined behavior):

  1. The processor should call the registerProcessorForNewFeatures function in SymbolProcessorEnvironment immediately when created (and only once). Example: AbstractTestProcessor.kt#L30
  2. All implementations of KSVisitor should move to KSVisitorNext. If their processor code does not directly implement the interface but instead extends one of the KSP-provided visitors (such as KSTopDownVisitor), they should instead extend KSTopDownVisitor(enableNewFeatures = true) and override visitBackingField depending on their code and needs.

Let us know if you run into unexpected behavior!

Bug Fixes

  • Fix Resolver.getDeclarationsFromPackage returning incomplete declarations from KLibs in Kotlin Multiplatform (#2396)
  • Fix KSP CLI process hanging indefinitely when a processor throws an unhandled exception (#3120)
  • Fix implicit task dependency error between KSP and Android Lint in Android KMP (#3128)
  • Fix NullPointerException by registering PluginProblemReporter as an application service (#3140)
  • Do not mark companion objects as JAVA_STATIC in Resolver.effectiveJavaModifiers (#3125)
  • Fix JAVA_STATIC modifier resolution for @​JvmStatic members in Resolver.effectiveJavaModifiers (#3124)
  • Update minimum supported Android Gradle Plugin (AGP) version to 8.12.0 (#3149)

New Contributors

Thanks to @​KlyneChrysler, @​budindepunk, and everyone who reported bugs and participated in discussions!

Full Changelog: google/ksp@2.3.11...2.3.12

Commits
  • a3c3859 Format Resolver file
  • a614317 Fix grammatical errors in Resolver doc comments
  • c19f255 Merge equal EXPECT NEXT and EXPECT CURRENT in javaBackingFieldUsedInKotlin
  • d3df886 Add test for getting default annotation values in KMP
  • 3bcac20 Mark testJavaBackingFieldUsedInKotlin as fixed
  • e74bb5f Update expected test output in libOrigins
  • c9b1d40 Use KSSyntheticJavaBackingFieldImpl in KSPropertyDeclarationImpl
  • afefe15 Add KSSyntheticJavaBackingFieldImpl
  • 2da07c1 Add test for missing synthetic Java fields
  • 7033530 Fix visibility modifiers for Kotlin-based backing fields
  • Additional commits viewable in compare view

Updates org.jetbrains.kotlin.plugin.serialization from 2.4.20 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.plugin.serialization's releases.

Kotlin 2.4.21

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log
  • KT-86251 K/N: Flaky linkDebugTestLinuxX64 failure with "truncated or malformed archive" on libstdlib-cache.a

Tools. Scripts

  • KT-89247 Kotlin Script: NoClassDefFoundError on 2nd execution with transitive dependency from imported script
  • KT-89220 JSR-223: generic Java bindings break all subsequent eval() calls
  • KT-88458 Audit closeable resource usage
  • KT-88453 VirtualFileScriptSource.text leaks an unclosed file stream — script source file handle held until GC, blocks file deletion on Windows

Kotlin 2.4.21-RC

Changelog

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin.plugin.serialization's changelog.

2.4.21

Backend. Wasm

  • KT-89267 K/Wasm: calling a (T) -> R lambda with an argument that isn't a T traps instead of throwing ClassCastException

JVM. Reflection

  • KT-89280 NoSuchElementException in argumentsMakeSenseOnlyForMutableContainer for Java non-static inner class of generic outer class
  • KT-80710 Reflection: change KCallable representation to avoid dependency on K1

JavaScript

  • KT-89449 Kotlin/JS: Member names no longer minified in production
  • KT-89363 KJS. Regular class with companion can't extend external class

Tools. Compiler plugins. Serialization

  • KT-89275 Kotlin/Wasm: Invalid Wasm is emitted for a @Serializable generic class with a class upper bound

Tools. Gradle. Native

  • KT-89285 SwiftPM import results in flooded log

@dependabot
Bump the kotlin-toolchain group across 1 directory with 5 updates
c9caa56 
Bumps the kotlin-toolchain group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [org.jetbrains.kotlin:kotlin-test](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |
| [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |
| [org.jetbrains.kotlin.multiplatform](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |
| [org.jetbrains.kotlin.plugin.serialization](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |
| [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |
| [org.jetbrains.kotlin.multiplatform](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |
| [com.google.devtools.ksp](https://github.com/google/ksp) | `2.3.11` | `2.3.12` |
| [org.jetbrains.kotlin.plugin.serialization](https://github.com/JetBrains/kotlin) | `2.4.20` | `2.4.21` |



Updates `org.jetbrains.kotlin:kotlin-test` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

Updates `org.jetbrains.kotlin.jvm` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

Updates `org.jetbrains.kotlin.multiplatform` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

Updates `org.jetbrains.kotlin.plugin.serialization` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

Updates `org.jetbrains.kotlin.jvm` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

Updates `org.jetbrains.kotlin.multiplatform` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

Updates `com.google.devtools.ksp` from 2.3.11 to 2.3.12
- [Release notes](https://github.com/google/ksp/releases)
- [Commits](google/ksp@2.3.11...2.3.12)

Updates `org.jetbrains.kotlin.plugin.serialization` from 2.4.20 to 2.4.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.4.20...v2.4.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-test
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: org.jetbrains.kotlin.multiplatform
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: org.jetbrains.kotlin.plugin.serialization
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: org.jetbrains.kotlin.multiplatform
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: com.google.devtools.ksp
  dependency-version: 2.3.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
- dependency-name: org.jetbrains.kotlin.plugin.serialization
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin-toolchain
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file java Pull requests that update java code labels Oct 12, 2026

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