diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff8743e2..5a3afa70 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,39 @@
 Changelog
 =========
 
+**Unreleased**
+--------------
+
+### **New**: Publish a new `moshi-immutable-adapters` artifact with support for [kotlinx.collections.immutable](https://github.com/Kotlin/kotlinx.collections.immutable).
+
+Gradle dependency
+
+```kotlin
+dependencies {
+  implementation("dev.zacsweers.moshix:moshi-immutable-adapters:<version>")
+}
+```
+
+In code
+
+```kotlin
+val moshi = Moshi.Builder().add(ImmutableCollectionsJsonAdapterFactory()).build()
+```
+
+**Supported types**
+
+- `ImmutableCollection`
+- `ImmutableList`
+- `ImmutableSet`
+- `ImmutableMap`
+- `PersistentCollection`
+- `PersistentList`
+- `PersistentSet`
+- `PersistentMap`
+
+### Misc
+- Omit the stdlib from transitive dependencies on the compiler plugin and Gradle plugin artifacts. Both kotlinc and Gradle impose their own versions on the classpath.
+
 0.25.1
 ------
 
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index fed11253..bc1a95fb 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -60,6 +60,7 @@ kotlin-metadata = { module = "org.jetbrains.kotlinx:kotlinx-metadata-jvm", versi
 kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect", version.ref = "kotlin" }
 kotlin-gradlePlugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 kotlin-gradlePlugin-api = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin-api", version.ref = "kotlin" }
+kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }
 kotlinx-immutable = "org.jetbrains.kotlinx:kotlinx-collections-immutable:0.3.7"
 
 kotlinpoet = { module = "com.squareup:kotlinpoet", version.ref = "kotlinpoet" }
diff --git a/moshi-immutable-adapters/src/test/kotlin/dev/zacsweers/moshix/adapters/immutable/ImmutableCollectionsJsonAdapterFactoryTest.kt b/moshi-immutable-adapters/src/test/kotlin/dev/zacsweers/moshix/adapters/immutable/ImmutableCollectionsJsonAdapterFactoryTest.kt
index 49b4827c..e5660a4c 100644
--- a/moshi-immutable-adapters/src/test/kotlin/dev/zacsweers/moshix/adapters/immutable/ImmutableCollectionsJsonAdapterFactoryTest.kt
+++ b/moshi-immutable-adapters/src/test/kotlin/dev/zacsweers/moshix/adapters/immutable/ImmutableCollectionsJsonAdapterFactoryTest.kt
@@ -1,5 +1,6 @@
 package dev.zacsweers.moshix.adapters.immutable
 
+import com.google.common.truth.Truth.assertThat
 import com.squareup.moshi.Moshi
 import com.squareup.moshi.adapter
 import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
@@ -84,9 +85,12 @@ class ImmutableCollectionsJsonAdapterFactoryTest {
             "c" to persistentListOf(1, 2, 3),
           ),
       )
+    assertThat(instance).isEqualTo(expectedInstance)
+    val serializedAndReserializedInstance = adapter.fromJson(adapter.toJson(expectedInstance))!!
+    assertThat(serializedAndReserializedInstance).isEqualTo(expectedInstance)
   }
 
-  class ClassWithImmutables(
+  data class ClassWithImmutables(
     val list: ImmutableList<Int>,
     val set: ImmutableSet<Int>,
     val collection: ImmutableCollection<Int>,
diff --git a/moshi-ir/moshi-compiler-plugin/build.gradle.kts b/moshi-ir/moshi-compiler-plugin/build.gradle.kts
index 9b2798b2..7ce7a971 100644
--- a/moshi-ir/moshi-compiler-plugin/build.gradle.kts
+++ b/moshi-ir/moshi-compiler-plugin/build.gradle.kts
@@ -34,6 +34,7 @@ tasks.withType<Test>().configureEach {
 }
 
 dependencies {
+  compileOnly(libs.kotlin.stdlib)
   compileOnly(libs.kotlin.compilerEmbeddable)
   implementation(libs.autoService)
   implementation(libs.moshi)
diff --git a/moshi-ir/moshi-compiler-plugin/gradle.properties b/moshi-ir/moshi-compiler-plugin/gradle.properties
index eec61c9a..432dc01a 100644
--- a/moshi-ir/moshi-compiler-plugin/gradle.properties
+++ b/moshi-ir/moshi-compiler-plugin/gradle.properties
@@ -1,3 +1,6 @@
 POM_NAME=Moshi Compiler Plugin
 POM_ARTIFACT_ID=moshi-compiler-plugin
 POM_PACKAGING=jar
+
+# kotlinc imposes its own
+kotlin.stdlib.default.dependency=false
diff --git a/moshi-ir/moshi-gradle-plugin/build.gradle.kts b/moshi-ir/moshi-gradle-plugin/build.gradle.kts
index 8958fb29..e70a66f4 100644
--- a/moshi-ir/moshi-gradle-plugin/build.gradle.kts
+++ b/moshi-ir/moshi-gradle-plugin/build.gradle.kts
@@ -107,6 +107,7 @@ spotless {
 dependencies {
   compileOnly(libs.kotlin.gradlePlugin)
   compileOnly(libs.kotlin.gradlePlugin.api)
+  compileOnly(libs.kotlin.stdlib)
   compileOnly(libs.ksp.gradlePlugin)
   compileOnly(libs.agp)
 }
diff --git a/moshi-ir/moshi-gradle-plugin/gradle.properties b/moshi-ir/moshi-gradle-plugin/gradle.properties
index 30e80f62..8bf351de 100644
--- a/moshi-ir/moshi-gradle-plugin/gradle.properties
+++ b/moshi-ir/moshi-gradle-plugin/gradle.properties
@@ -2,6 +2,9 @@ POM_NAME=Moshi Gradle Plugin
 POM_ARTIFACT_ID=moshi-gradle-plugin
 POM_PACKAGING=jar
 
+# Gradle imposes its own
+kotlin.stdlib.default.dependency=false
+
 GROUP=dev.zacsweers.moshix
 VERSION_NAME=0.26.0-SNAPSHOT
 POM_DESCRIPTION=A Kotlin compiler plugin that generates Moshi JsonAdapter classes.