<p>JetBrains has released Kotlin 2.4.0. The update includes stable language features, standard library additions, Kotlin/Native changes for Swift interoperability, Kotlin/Wasm and Kotlin/JS improvements, and build tool updates for Gradle and Maven.</p>
<p>The release is included in the latest versions of IntelliJ IDEA and Android Studio. Projects can update by setting the Kotlin version to <code>2.4.0</code> in their build scripts.</p>
<h2>Language and Standard Library</h2>
<p>Several language features that were previously experimental are now stable, including context parameters, explicit backing fields, the <code>@all</code> meta-target for properties, and new defaulting rules for annotation use-site targets.</p>
<p>The common standard library now has a stable <code>kotlin.uuid.Uuid</code> API. Kotlin 2.4.0 also adds sorted-order checks such as <code>.isSorted()</code> and <code>.isSortedBy()</code>, plus JVM extensions for converting unsigned integers to <code>BigInteger</code>.</p>
<p>On Kotlin/JVM, the compiler can generate Java 26 bytecode, and annotations in Kotlin metadata are now enabled by default.</p>
<h2>Kotlin/Native and KMP</h2>
<p>For Kotlin Multiplatform projects, the main changes are in Kotlin/Native. Swift export is now Alpha and has improved concurrency support: Kotlin suspend functions are exported as Swift <code>async</code> counterparts, and <code>kotlinx.coroutines</code> flows can be exported to Swift as <code>AsyncSequence</code>.</p>
<p>KMP projects can also declare Swift packages as dependencies for iOS apps directly in Gradle configuration. JetBrains also provides migration support for projects that currently rely on CocoaPods dependencies.</p>
<p>Kotlin/Native now supports Xcode 26.4, updates LLVM to version 21, and enables the concurrent mark and sweep garbage collector by default. The default minimum supported Apple target versions have also been raised to iOS and tvOS 15.0, macOS 12.0, and watchOS 8.0.</p>
<h2>Wasm, JS, and Build Tools</h2>
<p>Kotlin/Wasm incremental compilation is now stable and enabled by default. Kotlin 2.4.0 also introduces experimental support for the WebAssembly Component Model.</p>
<p>Kotlin/JS improves JavaScript and TypeScript export with support for value class export and ES2015 features when inlining JavaScript code.</p>
<p>On the build side, Kotlin 2.4.0 is compatible with Gradle 9.5.0. Maven builds now support automatic alignment between Java and JVM target versions.</p>
<p>Official announcement:
<a href="https://blog.jetbrains.com/kotlin/2026/06/kotlin-2-4-0-released/" target="_blank" rel="noopener nofollow">https://blog.jetbrains.com/kotlin/2026/06/kotlin-2-4-0-released/</a></p>
<p>Detailed release notes:
<a href="https://kotlinlang.org/docs/whatsnew24.html" target="_blank" rel="noopener nofollow">https://kotlinlang.org/docs/whatsnew24.html</a></p>


Kotlin Multiplatform

JetBrains has released Kotlin 2.4.0 with several notable updates. Language features previously in experimental status — including context parameters, explicit backing fields, and `@all` meta-target — are now stable. The standard library gains a stable `kotlin.uuid.Uuid` API, sorted-order check extensions, and JVM unsigned-to-BigInteger conversions. Kotlin/Native advances Swift export to Alpha, enabling suspend functions to export as Swift async counterparts and coroutines flows as AsyncSequence. Swift package dependencies can now be declared directly in Gradle for KMP iOS projects. Kotlin/Wasm incremental compilation is now stable, and experimental WebAssembly Component Model support is introduced. Kotlin/JS improves value class and ES2015 export. The release also brings Gradle 9.5.0 compatibility and Maven Java/JVM target auto-alignment.

Kotlin 2.4.0 Released