diff --git a/README.md b/README.md
index c2fa8318..4f00987c 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,7 @@ Kotlin-Compile-Testing is compatible with all _local_ compiler versions. It does
 However, if your project or any of its dependencies depend directly on compiler artifacts such as `kotlin-compiler-embeddable` or `kotlin-annotation-processing-embeddable` then they have to be the same version as the one used by Kotlin-Compile-Testing or there will be a transitive dependency conflict.
 
 
-- Current `kotlin-compiler-embeddable` version: `1.8.0`
+- Current `kotlin-compiler-embeddable` version: `1.8.21`
 
 Because the internal APIs of the Kotlin compiler often change between versions, we can only support one `kotlin-compiler-embeddable` version at a time. 
 
diff --git a/build.gradle b/build.gradle
index d1699357..3bf8c094 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,6 @@
 buildscript {
-    ext.kotlin_version = '1.8.0'
-    ext.embedded_kotlin_version = '1.8.0'
+    ext.kotlin_version = '1.8.21'
+    ext.embedded_kotlin_version = '1.8.21'
 
     repositories {
         mavenCentral()
diff --git a/core/src/main/kotlin/com/tschuchort/compiletesting/KotlinJsCompilation.kt b/core/src/main/kotlin/com/tschuchort/compiletesting/KotlinJsCompilation.kt
index b79dd312..172fb7df 100644
--- a/core/src/main/kotlin/com/tschuchort/compiletesting/KotlinJsCompilation.kt
+++ b/core/src/main/kotlin/com/tschuchort/compiletesting/KotlinJsCompilation.kt
@@ -3,6 +3,8 @@ package com.tschuchort.compiletesting
 import org.jetbrains.kotlin.cli.common.arguments.K2JSCompilerArguments
 import org.jetbrains.kotlin.cli.js.K2JSCompiler
 import java.io.*
+import java.nio.file.Paths
+import kotlin.io.path.nameWithoutExtension
 
 @Suppress("MemberVisibilityCanBePrivate")
 class KotlinJsCompilation : AbstractKotlinCompilation<K2JSCompilerArguments>() {
@@ -79,7 +81,8 @@ class KotlinJsCompilation : AbstractKotlinCompilation<K2JSCompilerArguments>() {
     args.noStdlib = true
 
     args.moduleKind = "commonjs"
-    args.outputFile = File(outputDir, outputFileName).absolutePath
+    args.outputDir = outputDir.absolutePath // -ir-output-dir
+    args.moduleName = Paths.get(outputFileName).nameWithoutExtension  // -ir-output-name
     args.sourceMapBaseDirs = jsClasspath().joinToString(separator = File.pathSeparator)
     args.libraries = listOfNotNull(kotlinStdLibJsJar).joinToString(separator = ":")
 
diff --git a/ksp/build.gradle b/ksp/build.gradle
index 49fd1a3e..0e388cfb 100644
--- a/ksp/build.gradle
+++ b/ksp/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.ksp_version = '1.8.0-1.0.8'
+    ext.ksp_version = '1.8.21-1.0.11'
 }
 
 dependencies {