Kotlin Help

Kotlin releases

Since Kotlin 2.0.0, we ship the following types of releases:

  • Language releases (2.x.0) that bring major changes in the language and include tooling updates. Released once in 6 months.

  • Tooling releases (2.x.20) that are shipped between language releases and include updates in the tooling, performance improvements, and bug fixes. Released in 3 months after corresponding language release.

  • Bug fix releases (2.x.yz) that include bug fixes for tooling releases. There is no exact release schedule for these releases.

For each language and tooling release, we also ship several preview (EAP) versions for you to try new features before they are released. See Early Access Preview for details.

Update to a new release

To upgrade your project to a new release, you need to update your build script file. For example, to update to Kotlin 2.0.0, change the version of the Kotlin Gradle plugin in your build.gradle(.kts) file:

plugins { // Replace `<...>` with the plugin name appropriate for your target environment kotlin("<...>") version "2.0.0" // For example, if your target environment is JVM: // kotlin("jvm") version "2.0.0" // If you target is Kotlin Multiplatform // kotlin("multiplatform") version "2.0.0" }
plugins { // Replace `<...>` with the plugin name appropriate for your target environment id 'org.jetbrains.kotlin.<...>' version '2.0.0' // For example, if your target environment is JVM: // id 'org.jetbrains.kotlin.jvm' version '2.0.0' // If you target is Kotlin Multiplatform // id 'org.jetbrains.kotlin.multiplatform' version '2.0.0' }

If you have projects created with earlier Kotlin versions, change the Kotlin version in your projects and update kotlinx libraries if necessary.

If you are migrating to the new language release, Kotlin plugin's migration tools will help you with the migration.

IDE support

Even with the release of the K2 compiler, IntelliJ IDEA and Android Studio still use the previous compiler by default for code analysis, code completion, highlighting, and other IDE-related features.

Starting from 2024.1, IntelliJ IDEA can use the new K2 compiler to analyze your code with its K2 Kotlin mode. To enable it, go to Settings | Languages & Frameworks | Kotlin and select the Enable the K2-based Kotlin plugin option.

After enabling K2 mode, you may notice differences in IDE analysis due to changes in compiler behavior. Learn how the new K2 compiler differs from the previous one in the migration guide.

Kotlin release compatibility

Learn more about types of Kotlin releases and their compatibility

Release details

The following table lists details of the latest Kotlin releases:

Build info

Build highlights

2.0.0

Released: May 21, 2024

Release on GitHub

A language release with the Stable Kotlin K2 compiler.

Learn more about Kotlin 2.0.0 in What's new in Kotlin 2.0.0.

1.9.24

Released: May 7, 2024

Release on GitHub

A bug fix release for Kotlin 1.9.20, 1.9.21, 1.9.22, and 1.9.23.

Learn more about Kotlin 1.9.20 in What's new in Kotlin 1.9.20.

1.9.23

Released: March 7, 2024

Release on GitHub

A bug fix release for Kotlin 1.9.20, 1.9.21, and 1.9.22.

Learn more about Kotlin 1.9.20 in What's new in Kotlin 1.9.20.

1.9.22

Released: December 21, 2023

Release on GitHub

A bug fix release for Kotlin 1.9.20 and 1.9.21.

Learn more about Kotlin 1.9.20 in What's new in Kotlin 1.9.20.

1.9.21

Released: November 23, 2023

Release on GitHub

A bug fix release for Kotlin 1.9.20.

Learn more about Kotlin 1.9.20 in What's new in Kotlin 1.9.20.

1.9.20

Released: November 1, 2023

Release on GitHub

A feature release with Kotlin K2 compiler in Beta and Stable Kotlin Multiplatform.

Learn more in:

1.9.10

Released: August 23, 2023

Release on GitHub

A bug fix release for Kotlin 1.9.0.

Learn more about Kotlin 1.9.0 in What's new in Kotlin 1.9.0.

1.9.0

Released: July 6, 2023

Release on GitHub

A feature release with Kotlin K2 compiler updates, new enum class values function, new operator for open-ended ranges, preview of Gradle configuration cache in Kotlin Multiplatform, changes to Android target support in Kotlin Multiplatform, preview of custom memory allocator in Kotlin/Native.

Learn more in:

1.8.22

Released: June 8, 2023

Release on GitHub

A bug fix release for Kotlin 1.8.20.

Learn more about Kotlin 1.8.20 in What's new in Kotlin 1.8.20.

1.8.21

Released: April 25, 2023

Release on GitHub

A bug fix release for Kotlin 1.8.20.

Learn more about Kotlin 1.8.20 in What's new in Kotlin 1.8.20.

1.8.20

Released: April 3, 2023

Release on GitHub

A feature release with Kotlin K2 compiler updates, AutoCloseable interface and Base64 encoding in stdlib, new JVM incremental compilation enabled by default, new Kotlin/Wasm compiler backend.

Learn more in:

1.8.10

Released: February 2, 2023

Release on GitHub

A bug fix release for Kotlin 1.8.0.

Learn more about Kotlin 1.8.0.

1.8.0

Released: December 28, 2022

Release on GitHub

A feature release with improved kotlin-reflect performance, new recursively copy or delete directory content experimental functions for JVM, improved Objective-C/Swift interoperability.

Learn more in:

1.7.21

Released: November 9, 2022

Release on GitHub

A bug fix release for Kotlin 1.7.20.

Learn more about Kotlin 1.7.20 in What's new in Kotlin 1.7.20.

1.7.20

Released: September 29, 2022

Release on GitHub

An incremental release with new language features, the support for several compiler plugins in the Kotlin K2 compiler, the new Kotlin/Native memory manager enabled by default, and the support for Gradle 7.1.

Learn more in:

Learn more about Kotlin 1.7.20.

1.7.10

Released: July 7, 2022

Release on GitHub

A bug fix release for Kotlin 1.7.0.

Learn more about Kotlin 1.7.0.

1.7.0

Released: June 9, 2022

Release on GitHub

A feature release with Kotlin K2 compiler in Alpha for JVM, stabilized language features, performance improvements, and evolutionary changes such as stabilizing experimental APIs.

Learn more in:

1.6.21

Released: April 20, 2022

Release on GitHub

A bug fix release for Kotlin 1.6.20.

Learn more about Kotlin 1.6.20.

1.6.20

Released: April 4, 2022

Release on GitHub

An incremental release with various improvements such as:

  • Prototype of context receivers

  • Callable references to functional interface constructors

  • Kotlin/Native: performance improvements for the new memory manager

  • Multiplatform: hierarchical project structure by default

  • Kotlin/JS: IR compiler improvements

  • Gradle: compiler execution strategies

Learn more about Kotlin 1.6.20.

1.6.10

Released: December 14, 2021

Release on GitHub

A bug fix release for Kotlin 1.6.0.

Learn more about Kotlin 1.6.0.

1.6.0

Released: November 16, 2021

Release on GitHub

A feature release with new language features, performance improvements, and evolutionary changes such as stabilizing experimental APIs.

Learn more in:

1.5.32

Released: November 29, 2021

Release on GitHub

A bug fix release for Kotlin 1.5.31.

Learn more about Kotlin 1.5.30.

1.5.31

Released: September 20, 2021

Release on GitHub

A bug fix release for Kotlin 1.5.30.

Learn more about Kotlin 1.5.30.

1.5.30

Released: August 23, 2021

Release on GitHub

An incremental release with various improvements such as:

  • Instantiation of annotation classes on JVM

  • Improved opt-in requirement mechanism and type inference

  • Kotlin/JS IR backend in Beta

  • Support for Apple Silicon targets

  • Improved CocoaPods support

  • Gradle: Java toolchain support and improved daemon configuration

Learn more in:

1.5.21

Released: July 13, 2021

Release on GitHub

A bug fix release for Kotlin 1.5.20.

Learn more about Kotlin 1.5.20.

1.5.20

Released: June 24, 2021

Release on GitHub

An incremental release with various improvements such as:

  • String concatenation via invokedynamic on JVM by default

  • Improved support for Lombok and support for JSpecify

  • Kotlin/Native: KDoc export to Objective-C headers and faster Array.copyInto() inside one array

  • Gradle: caching of annotation processors' classloaders and support for the --parallel Gradle property

  • Aligned behavior of stdlib functions across platforms

Learn more in:

1.5.10

Released: May 24, 2021

Release on GitHub

A bug fix release for Kotlin 1.5.0.

Learn more about Kotlin 1.5.0.

1.5.0

Released: May 5, 2021

Release on GitHub

A feature release with new language features, performance improvements, and evolutionary changes such as stabilizing experimental APIs.

Learn more in:

1.4.32

Released: March 22, 2021

Release on GitHub

A bug fix release for Kotlin 1.4.30.

Learn more about Kotlin 1.4.30.

1.4.31

Released: February 25, 2021

Release on GitHub

A bug fix release for Kotlin 1.4.30

Learn more about Kotlin 1.4.30.

1.4.30

Released: February 3, 2021

Release on GitHub

An incremental release with various improvements such as:

  • New JVM backend, now in Beta

  • Preview of new language features

  • Improved Kotlin/Native performance

  • Standard library API improvements

Learn more in:

1.4.21

Released: December 7, 2020

Release on GitHub

A bug fix release for Kotlin 1.4.20

Learn more about Kotlin 1.4.20.

1.4.20

Released: November 23, 2020

Release on GitHub

An incremental release with various improvements such as:

  • Supporting new JVM features, like string concatenation via invokedynamic

  • Improved performance and exception handling for Kotlin Multiplatform Mobile projects

  • Extensions for JDK Path: Path("dir") / "file.txt"

Learn more in:

1.4.10

Released: September 7, 2020

Release on GitHub

A bug fix release for Kotlin 1.4.0.

Learn more about Kotlin 1.4.0.

1.4.0

Released: August 17, 2020

Release on GitHub

A feature release with many features and improvements that mostly focus on quality and performance.

Learn more in:

1.3.72

Released: April 15, 2020

Release on GitHub

A bug fix release for Kotlin 1.3.70.

Learn more about Kotlin 1.3.70.

Last modified: 21 May 2024