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chore(deps): bump the backend-kotlin group across 1 directory with 2 updates - #1638

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chore(deps): bump the backend-kotlin group across 1 directory with 2 updates#1638
rm3l merged 2 commits into
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dependabot/gradle/backend/backend-kotlin-64350ca3f7

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Bumps the backend-kotlin group with 2 updates in the /backend directory: org.jetbrains.kotlin.jvm and org.jetbrains.kotlin.plugin.allopen.

Updates org.jetbrains.kotlin.jvm from 2.1.21 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

2.4.20

Analysis API

  • KT-86546 Check suspicious when over ConeKotlinType in ConeTypeCompatibilityChecker
  • KT-85418 Implement an API for accessing deserialized file annotations in Analysis API
  • KT-74448 K2. False positive MISSING_DEPENDENCY_SUPERCLASS in LinkedListTest.kt, kotlinx.coroutines
  • KT-85856 containingSymbol of constructor property differs for local and non-local classes
  • KT-65417 K2 IDE: KTOR false positive expect-actual matching error on enum class because of implicit clone() in non-JVM source sets

Analysis API. Code Compilation

  • KT-76457 K2 IDE / KMP Debugger: KISEWA “Cannot compile a common source without a JVM counterpart” on evaluating inline fun from common module inside jvm

Analysis API. FIR

... (truncated)

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.allopen from 2.1.21 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin.plugin.allopen'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.allopen'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

2.4.20

Analysis API

  • KT-86546 Check suspicious when over ConeKotlinType in ConeTypeCompatibilityChecker
  • KT-85418 Implement an API for accessing deserialized file annotations in Analysis API
  • KT-74448 K2. False positive MISSING_DEPENDENCY_SUPERCLASS in LinkedListTest.kt, kotlinx.coroutines
  • KT-85856 containingSymbol of constructor property differs for local and non-local classes
  • KT-65417 K2 IDE: KTOR false positive expect-actual matching error on enum class because of implicit clone() in non-JVM source sets

Analysis API. Code Compilation

  • KT-76457 K2 IDE / KMP Debugger: KISEWA “Cannot compile a common source without a JVM counterpart” on evaluating inline fun from common module inside jvm

Analysis API. FIR

... (truncated)

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

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@dependabot
chore(deps): bump the backend-kotlin group across 1 directory with 2 …
bfc5ea0 
…updates

Bumps the backend-kotlin group with 2 updates in the /backend directory: [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) and [org.jetbrains.kotlin.plugin.allopen](https://github.com/JetBrains/kotlin).


Updates `org.jetbrains.kotlin.jvm` from 2.1.21 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@v2.1.21...v2.4.21)

Updates `org.jetbrains.kotlin.plugin.allopen` from 2.1.21 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@v2.1.21...v2.4.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend-kotlin
- dependency-name: org.jetbrains.kotlin.plugin.allopen
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend-kotlin
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot
dependabot Bot requested a review from rm3l as a code owner October 18, 2026 21:49
@dependabot dependabot Bot added the dependencies Pull requests that update a dependency file label Oct 18, 2026
This was referenced Oct 18, 2026
Closed
Closed
@rm3l @claude
fix: update Kotlin language version to 2.0 for Kotlin 2.4.21 compatib…
95c9592 
…ility

Kotlin 2.4.21 dropped support for languageVersion 1.6. Update to 2.0
(the minimum supported) and switch -Xopt-in to -opt-in (promoted from
experimental in Kotlin 2.0).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rm3l
rm3l merged commit 5c70bf9 into master Oct 18, 2026
7 checks passed
@rm3l
rm3l deleted the dependabot/gradle/backend/backend-kotlin-64350ca3f7 branch October 18, 2026 22:05
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