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Bump kotlinVersion from 2.4.10 to 2.4.21 - #3979

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Bumps kotlinVersion from 2.4.10 to 2.4.21.
Updates org.jetbrains.kotlin:kotlin-reflect from 2.4.10 to 2.4.21

Release notes

Sourced from org.jetbrains.kotlin:kotlin-reflect'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-reflect'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:kotlin-stdlib from 2.4.10 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

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:kotlin-test from 2.4.10 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

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.parcelize from 2.4.10 to 2.4.21

Updates org.jetbrains.kotlin.plugin.compose from 2.4.10 to 2.4.21

Updates org.jetbrains.kotlin.plugin.serialization from 2.4.10 to 2.4.21

Updates org.jetbrains.kotlin.multiplatform from 2.4.10 to 2.4.21

@dependabot dependabot Bot added dependencies Pull requests that update a dependency file java Pull requests that update java code labels Oct 15, 2026
@dependabot
dependabot Bot force-pushed the dependabot/gradle/master/kotlinVersion-2.4.21 branch from 025ace6 to c42317a Compare October 29, 2026 13:56
@dependabot
dependabot Bot force-pushed the dependabot/gradle/master/kotlinVersion-2.4.21 branch from c42317a to f1dc67d Compare October 29, 2026 15:46
Bumps `kotlinVersion` from 2.4.10 to 2.4.21.

Updates `org.jetbrains.kotlin:kotlin-reflect` from 2.4.10 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@v2.4.10...v2.4.21)

Updates `org.jetbrains.kotlin:kotlin-stdlib` from 2.4.10 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@v2.4.10...v2.4.21)

Updates `org.jetbrains.kotlin:kotlin-test` from 2.4.10 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@v2.4.10...v2.4.21)

Updates `org.jetbrains.kotlin.plugin.parcelize` from 2.4.10 to 2.4.21

Updates `org.jetbrains.kotlin.plugin.compose` from 2.4.10 to 2.4.21

Updates `org.jetbrains.kotlin.plugin.serialization` from 2.4.10 to 2.4.21

Updates `org.jetbrains.kotlin.multiplatform` from 2.4.10 to 2.4.21

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.multiplatform
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.plugin.compose
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.plugin.parcelize
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.plugin.serialization
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-reflect
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-test
  dependency-version: 2.4.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot
dependabot Bot force-pushed the dependabot/gradle/master/kotlinVersion-2.4.21 branch from f1dc67d to 4522bf0 Compare October 29, 2026 15:53
@codecov

codecov Bot commented Oct 30, 2026 •

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.03%. Comparing base (4240c1b) to head (4e36d9b).

Additional details and impacted files
@@            Coverage Diff            @@
##             master    #3979   +/-   ##
=========================================
  Coverage     70.03%   70.03%           
- Complexity     2105     2106    +1     
=========================================
  Files           441      441           
  Lines         11869    11868    -1     
  Branches       1545     1545           
=========================================
  Hits           8312     8312           
+ Misses         2781     2780    -1     
  Partials        776      776           

see 2 files with indirect coverage changes

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  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

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e2e-approval — 4e36d9b0 Deployed Oct 31, 2026 by rfontanarosa via instrumentation-tests / request-approval #1364
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