Versuche

frontend/shells/meldestelle-portal/build.gradle.kts

@@ -19,7 +19,7 @@ plugins {
 kotlin {
     val enableWasm = providers.gradleProperty("enableWasm").orNull == "true"
 
-    jvmToolchain(21)
+    jvmToolchain(25)
 
     // JVM Target für Desktop
     jvm {
@@ -136,7 +136,7 @@ kotlin {
 // KMP Compile-Optionen
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
     compilerOptions {
-        jvmTarget.set(JvmTarget.JVM_21)
+        jvmTarget.set(JvmTarget.JVM_25)
         freeCompilerArgs.addAll(
             "-opt-in=kotlin.RequiresOptIn",
             "-Xskip-metadata-version-check", // Für bleeding-edge Versionen