Prepare 1.9.0 release

Author: sandwwraith

CHANGELOG.md

@@ -1,3 +1,22 @@
+1.9.0 / 2025-06-27
+==================
+
+This release updates Kotlin version to 2.2.0, includes several bugfixes and provides serializers for kotlin.time.Instant.
+
+## Add kotlin.time.Instant serializers
+
+Instant class was moved from kotlinx-datetime library to Kotlin standard library. 
+As a result, kotlinx-datetime 0.7.0 no longer has serializers for the Instant class.
+To use new kotlin.time.Instant class in your @Serializable classes,
+you can use this 1.9.0 kotlinx-serialization version (Kotlin 2.2 is required).
+You can choose between default `InstantSerializer` which uses its string representation,
+or specify `InstantComponentSerializer` that represents instant as its components.
+See details in the [PR](https://github.com/Kotlin/kotlinx.serialization/pull/2945).
+
+## Other bugfixes
+  * Fix resize in JsonPath (#2995)
+  * Fixed proguard rules for obfuscation to work correctly (#2983)
+
 1.8.1 / 2025-03-31
 ==================
 

README.md

@@ -4,8 +4,8 @@
 [![JetBrains official project](https://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 [![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](http://www.apache.org/licenses/LICENSE-2.0)
 [![TeamCity build](https://img.shields.io/teamcity/http/teamcity.jetbrains.com/s/KotlinTools_KotlinxSerialization_Ko.svg)](https://teamcity.jetbrains.com/viewType.html?buildTypeId=KotlinTools_KotlinxSerialization_Ko&guest=1)
-[![Kotlin](https://img.shields.io/badge/kotlin-2.1.20-blue.svg?logo=kotlin)](http://kotlinlang.org)
-[![Maven Central](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-serialization-core/1.8.1)](https://central.sonatype.com/artifact/org.jetbrains.kotlinx/kotlinx-serialization-core/1.8.1)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.2.0-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Maven Central](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-serialization-core/1.9.0)](https://central.sonatype.com/artifact/org.jetbrains.kotlinx/kotlinx-serialization-core/1.9.0)
 [![KDoc link](https://img.shields.io/badge/API_reference-KDoc-blue)](https://kotlinlang.org/api/kotlinx.serialization/)
 [![Slack channel](https://img.shields.io/badge/chat-slack-blue.svg?logo=slack)](https://kotlinlang.slack.com/messages/serialization/)
 
@@ -94,17 +94,17 @@ Kotlin DSL:
 
 ```kotlin
 plugins {
-    kotlin("jvm") version "2.1.20" // or kotlin("multiplatform") or any other kotlin plugin
-    kotlin("plugin.serialization") version "2.1.20"
+    kotlin("jvm") version "2.2.0" // or kotlin("multiplatform") or any other kotlin plugin
+    kotlin("plugin.serialization") version "2.2.0"
 }
 ```       
 
 Groovy DSL:
 
 ```gradle
 plugins {
-    id 'org.jetbrains.kotlin.multiplatform' version '2.1.20'
-    id 'org.jetbrains.kotlin.plugin.serialization' version '2.1.20'
+    id 'org.jetbrains.kotlin.multiplatform' version '2.2.0'
+    id 'org.jetbrains.kotlin.plugin.serialization' version '2.2.0'
 }
 ```
 
@@ -122,7 +122,7 @@ buildscript {
     repositories { mavenCentral() }
 
     dependencies {
-        val kotlinVersion = "2.1.20"
+        val kotlinVersion = "2.2.0"
         classpath(kotlin("gradle-plugin", version = kotlinVersion))
         classpath(kotlin("serialization", version = kotlinVersion))
     }
@@ -133,7 +133,7 @@ Groovy DSL:
 
 ```gradle
 buildscript {
-    ext.kotlin_version = '2.1.20'
+    ext.kotlin_version = '2.2.0'
     repositories { mavenCentral() }
 
     dependencies {
@@ -163,7 +163,7 @@ repositories {
 }
 
 dependencies {
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0")
 }
 ```
 
@@ -175,7 +175,7 @@ repositories {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1"
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0"
 }
 ```
 
@@ -265,8 +265,8 @@ Ensure the proper version of Kotlin and serialization version:
 
 ```xml
 <properties>
-    <kotlin.version>2.1.20</kotlin.version>
-    <serialization.version>1.8.1</serialization.version>
+    <kotlin.version>2.2.0</kotlin.version>
+    <serialization.version>1.9.0</serialization.version>
 </properties>
 ```
 

gradle.properties

@@ -3,11 +3,11 @@
 #
 
 group=org.jetbrains.kotlinx
-version=1.8.2-SNAPSHOT
+version=1.9.1-SNAPSHOT
 jdk_toolchain_version=11
 
 # This version takes precedence if 'bootstrap' property passed to project
-kotlin.version.snapshot=2.1.255-SNAPSHOT
+kotlin.version.snapshot=2.2.255-SNAPSHOT
 # Also set kotlin.native.home to your $kotlin_project$/kotlin-native/dist if you want to use snapshot Native
 #kotlin.native.home=
 

integration-test/gradle.properties

@@ -3,7 +3,7 @@
 #
 
 mainKotlinVersion=2.2.0
-mainLibVersion=1.8.2-SNAPSHOT
+mainLibVersion=1.9.1-SNAPSHOT
 
 kotlin.code.style=official