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Bump org.jetbrains.kotlin:kotlin-stdlib from 2.4.20 to 2.4.21 - #449

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dependabot/maven/main/org.jetbrains.kotlin-kotlin-stdlib-2.4.21
Oct 15, 2026
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KarstenSchnitter merged 1 commit into
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dependabot/maven/main/org.jetbrains.kotlin-kotlin-stdlib-2.4.21

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@dependabot dependabot Bot commented on behalf of github Oct 12, 2026 •

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Bumps org.jetbrains.kotlin:kotlin-stdlib from 2.4.20 to 2.4.21.

Release notes

Sourced from org.jetbrains.kotlin:kotlin-stdlib'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-stdlib'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

@dependabot dependabot Bot added dependencies Pull requests that update a dependency file main-branch labels Oct 12, 2026
@KarstenSchnitter

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@dependabot rebase

Bumps [org.jetbrains.kotlin:kotlin-stdlib](https://github.com/JetBrains/kotlin) 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-stdlib
  dependency-version: 2.4.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot
dependabot Bot force-pushed the dependabot/maven/main/org.jetbrains.kotlin-kotlin-stdlib-2.4.21 branch from 13da41e to 63fe694 Compare October 15, 2026 10:30
@KarstenSchnitter
KarstenSchnitter merged commit 7709274 into main Oct 15, 2026
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@KarstenSchnitter
KarstenSchnitter deleted the dependabot/maven/main/org.jetbrains.kotlin-kotlin-stdlib-2.4.21 branch October 15, 2026 10:32
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