diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 740cf2c4855..59c2be88b75 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -165,9 +165,6 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
 
-    env:
-      KOTLIN_OVERRIDE: 1.9.30-dev-1098
-
     steps:
       - uses: actions/checkout@v4
         with:
@@ -182,7 +179,7 @@ jobs:
       - name: jvmTest (K2 enabled)
         uses: gradle/gradle-build-action@v2
         with:
-          arguments: jvmTest -Pkotlin.experimental.tryK2=true
+          arguments: "jvmTest -Pkotlin_version=1.9.30-dev-2548 -Pkotlin_repo_url=https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap -Pkotlin_language_version=2.0"
 
       - name: Upload reports
         if: failure()
diff --git a/arrow-libs/core/arrow-atomic/build.gradle.kts b/arrow-libs/core/arrow-atomic/build.gradle.kts
index c5930a388cc..53e4715ae43 100644
--- a/arrow-libs/core/arrow-atomic/build.gradle.kts
+++ b/arrow-libs/core/arrow-atomic/build.gradle.kts
@@ -1,5 +1,8 @@
 @file:Suppress("DSL_SCOPE_VIOLATION")
 
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+
 plugins {
   id(libs.plugins.kotlin.multiplatform.get().pluginId)
   alias(libs.plugins.arrowGradleConfig.kotlin)
@@ -77,3 +80,9 @@ kotlin {
     }
   }
 }
+
+tasks.withType<KotlinCompile>().configureEach {
+  kotlinOptions {
+    freeCompilerArgs = freeCompilerArgs + "-Xexpect-actual-classes"
+  }
+}
diff --git a/arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Validated.kt b/arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Validated.kt
index 4b1a23e872e..b33d6f29d9a 100644
--- a/arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Validated.kt
+++ b/arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Validated.kt
@@ -18,13 +18,13 @@ public typealias ValidatedNel<E, A> = Validated<Nel<E>, A>
 
 @Deprecated(
   ValidatedDeprMsg + "Use Right to construct Either values instead",
-  ReplaceWith("Either.Right(value)", "arrow.core.Either")
+  ReplaceWith("Either.Right<A>", "arrow.core.Either")
 )
 public typealias Valid<A> = Validated.Valid<A>
 
 @Deprecated(
   ValidatedDeprMsg + "Use Left to construct Either values instead",
-  ReplaceWith("Either.Left(value)", "arrow.core.Either")
+  ReplaceWith("Either.Left<E>", "arrow.core.Either")
 )
 public typealias Invalid<E> = Validated.Invalid<E>
 
@@ -318,7 +318,7 @@ public sealed class Validated<out E, out A> {
 
   @Deprecated(
     ValidatedDeprMsg + "Use Right to construct Either values instead",
-    ReplaceWith("Either.Right(value)", "arrow.core.Either")
+    ReplaceWith("Either.Right<A>", "arrow.core.Either")
   )
   public data class Valid<out A>(val value: A) : Validated<Nothing, A>() {
     override fun toString(): String = "Validated.Valid($value)"
@@ -332,7 +332,7 @@ public sealed class Validated<out E, out A> {
 
   @Deprecated(
     ValidatedDeprMsg + "Use Left to construct Either values instead",
-    ReplaceWith("Either.Left(value)", "arrow.core.Either")
+    ReplaceWith("Either.Left<E>", "arrow.core.Either")
   )
   public data class Invalid<out E>(val value: E) : Validated<E, Nothing>() {
     override fun toString(): String = "Validated.Invalid($value)"
diff --git a/build.gradle.kts b/build.gradle.kts
index 1f29a72bc3e..004599263ac 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -4,6 +4,7 @@ import kotlinx.knit.KnitPluginExtension
 import org.jetbrains.dokka.gradle.DokkaMultiModuleTask
 import org.jetbrains.dokka.gradle.DokkaTaskPartial
 import org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 buildscript {
   repositories {
@@ -21,7 +22,16 @@ allprojects {
   repositories {
     mavenCentral()
     maven(url = "https://oss.sonatype.org/content/repositories/snapshots/")
-    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap")
+    (project.rootProject.properties["kotlin_repo_url"] as? String)?.also { maven(it) }
+  }
+
+  tasks {
+    withType<KotlinCompile> {
+      kotlinOptions {
+        (project.rootProject.properties["kotlin_language_version"] as? String)?.also { languageVersion = it }
+        (project.rootProject.properties["kotlin_api_version"] as? String)?.also { apiVersion = it }
+      }
+    }
   }
 }
 
diff --git a/settings.gradle.kts b/settings.gradle.kts
index bb9ced41f33..771956c34f2 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -3,11 +3,12 @@ enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
 rootProject.name = "arrow"
 
 pluginManagement {
+  @Suppress("LocalVariableName") val kotlin_repo_url: String? by settings
   repositories {
     gradlePluginPortal()
     mavenCentral()
     mavenLocal()
-    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap")
+    kotlin_repo_url?.also { maven(it) }
   }
 }
 
@@ -17,17 +18,20 @@ plugins {
 }
 
 dependencyResolutionManagement {
+  @Suppress("LocalVariableName") val kotlin_repo_url: String? by settings
+  @Suppress("LocalVariableName") val kotlin_version: String? by settings
+
   repositories {
     mavenCentral()
     gradlePluginPortal()
     mavenLocal()
+    kotlin_repo_url?.also { maven(it) }
   }
   versionCatalogs {
     create("libs") {
-      val kotlinOverride = System.getenv("KOTLIN_OVERRIDE")
-      if (!kotlinOverride.isNullOrBlank()) {
-        println("Overriding Kotlin version with $kotlinOverride")
-        version("kotlin", kotlinOverride)
+      if (!kotlin_version.isNullOrBlank()) {
+        println("Overriding Kotlin version with $kotlin_version")
+        version("kotlin", kotlin_version!!)
       }
     }
   }