diff --git a/README.md b/README.md
index 2a464d9..9c1ac0c 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![License](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Java](https://img.shields.io/badge/java-17%2B-blue)](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html)
-[![Kotlin](https://img.shields.io/badge/kotlin-2.0.0-7f52ff.svg)](https://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-1.9.24-7f52ff.svg)](https://kotlinlang.org)
 [![bld](https://img.shields.io/badge/1.9.1-FA9052?label=bld&labelColor=2392FF)](https://rife2.com/bld)
 [![Release](https://flat.badgen.net/maven/v/metadata-url/repo.rife2.com/releases/com/uwyn/rife2/bld-kotlin/maven-metadata.xml?color=blue)](https://repo.rife2.com/#/releases/com/uwyn/rife2/bld-kotlin)
 [![Snapshot](https://flat.badgen.net/maven/v/metadata-url/repo.rife2.com/snapshots/com/uwyn/rife2/bld-kotlin/maven-metadata.xml?label=snapshot)](https://repo.rife2.com/#/snapshots/com/uwyn/rife2/bld-kotlin)
diff --git a/examples/lib/bld/bld-wrapper.properties b/examples/lib/bld/bld-wrapper.properties
index 066d395..81004ac 100644
--- a/examples/lib/bld/bld-wrapper.properties
+++ b/examples/lib/bld/bld-wrapper.properties
@@ -1,6 +1,6 @@
 bld.downloadExtensionJavadoc=false
 bld.downloadExtensionSources=true
-bld.extensions=com.uwyn.rife2:bld-kotlin:0.9.6
+bld.extensions=com.uwyn.rife2:bld-kotlin:0.9.5
 bld.repositories=MAVEN_LOCAL,MAVEN_CENTRAL,RIFE2_SNAPSHOTS,RIFE2_RELEASES
 bld.downloadLocation=
 bld.sourceDirectories=
diff --git a/examples/src/bld/java/com/example/ExampleBuild.java b/examples/src/bld/java/com/example/ExampleBuild.java
index 5cccf1a..71edf27 100644
--- a/examples/src/bld/java/com/example/ExampleBuild.java
+++ b/examples/src/bld/java/com/example/ExampleBuild.java
@@ -34,7 +34,7 @@ public class ExampleBuild extends Project {
 
         repositories = List.of(MAVEN_LOCAL, MAVEN_CENTRAL, RIFE2_RELEASES);
 
-        final var kotlin = version(2, 0, 0);
+        final var kotlin = version(1, 9, 24);
         scope(compile)
                 .include(dependency("org.jetbrains.kotlin", "kotlin-stdlib", kotlin));
         scope(test)
diff --git a/src/bld/java/rife/bld/extension/CompileKotlinOperationBuild.java b/src/bld/java/rife/bld/extension/CompileKotlinOperationBuild.java
index fe52487..f24da97 100644
--- a/src/bld/java/rife/bld/extension/CompileKotlinOperationBuild.java
+++ b/src/bld/java/rife/bld/extension/CompileKotlinOperationBuild.java
@@ -33,7 +33,7 @@ public class CompileKotlinOperationBuild extends Project {
     public CompileKotlinOperationBuild() {
         pkg = "rife.bld.extension";
         name = "bld-kotlin";
-        version = version(0, 9, 6);
+        version = version(0, 9, 5);
 
         javaRelease = 17;
         downloadSources = true;
@@ -41,7 +41,7 @@ public class CompileKotlinOperationBuild extends Project {
         repositories = List.of(MAVEN_LOCAL, MAVEN_CENTRAL, RIFE2_RELEASES);
 
         var dokka = version(1, 9, 20);
-        var kotlin = version(2, 0, 0);
+        var kotlin = version(1, 9, 24);
         scope(compile)
                 .include(dependency("org.jetbrains.kotlin", "kotlin-compiler", kotlin))
                 .include(dependency("org.jetbrains.kotlin", "kotlin-annotation-processing", kotlin))
diff --git a/src/main/java/rife/bld/extension/CompileKotlinOptions.java b/src/main/java/rife/bld/extension/CompileKotlinOptions.java
index 778a9a5..343d1ba 100644
--- a/src/main/java/rife/bld/extension/CompileKotlinOptions.java
+++ b/src/main/java/rife/bld/extension/CompileKotlinOptions.java
@@ -65,17 +65,6 @@ public class CompileKotlinOptions {
         return this;
     }
 
-    /**
-     * Allow using declarations only from the specified version of Kotlin bundled libraries.
-     *
-     * @param version the api version
-     * @return this operation instance
-     */
-    public CompileKotlinOptions apiVersion(int version) {
-        apiVersion_ = String.valueOf(version);
-        return this;
-    }
-
     /**
      * Read the compiler options from the given files.
      * <p>
diff --git a/src/test/java/rife/bld/extension/CompileKotlinOptionsTest.java b/src/test/java/rife/bld/extension/CompileKotlinOptionsTest.java
index 6324765..f19663d 100644
--- a/src/test/java/rife/bld/extension/CompileKotlinOptionsTest.java
+++ b/src/test/java/rife/bld/extension/CompileKotlinOptionsTest.java
@@ -19,7 +19,6 @@ package rife.bld.extension;
 import org.junit.jupiter.api.Test;
 
 import java.io.File;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.IntStream;
 
@@ -55,7 +54,7 @@ class CompileKotlinOptionsTest {
 
     @Test
     void argsTest() {
-        var options = new CompileKotlinOptions()
+        var args = new CompileKotlinOptions()
                 .apiVersion("11")
                 .argFile("file.txt", "file2.txt")
                 .classpath("path1", "path2")
@@ -77,7 +76,8 @@ class CompileKotlinOptionsTest {
                 .progressive(true)
                 .scriptTemplates("name", "name2")
                 .verbose(true)
-                .wError(true);
+                .wError(true)
+                .args();
 
         var matches = List.of(
                 "-api-version", "11",
@@ -105,13 +105,8 @@ class CompileKotlinOptionsTest {
                 "-verbose",
                 "-Werror");
 
-        var args = new ArrayList<List<String>>();
-        args.add(options.args());
-        args.add(options.apiVersion(11).jvmTarget(11).args());
+        assertThat(args).hasSize(matches.size());
 
-        for (var a: args) {
-            assertThat(a).hasSize(matches.size());
-            IntStream.range(0, a.size()).forEach(i -> assertThat(a.get(i)).isEqualTo(matches.get(i)));
-        }
+        IntStream.range(0, args.size()).forEach(i -> assertThat(args.get(i)).isEqualTo(matches.get(i)));
     }
 }