diff --git a/build.gradle.kts b/build.gradle.kts
index d983ada5..e9c4c0e7 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -41,8 +41,7 @@ tasks {
         compilerOptions {
             jvmTarget = JvmTarget.JVM_17
             languageVersion = KotlinVersion.DEFAULT
-            // see https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#kotlin-standard-library
-            apiVersion = KotlinVersion.KOTLIN_1_8
+            apiVersion = KotlinVersion.KOTLIN_1_9
         }
     }
     val copyStubs = register<Copy>("copyStubs") {
diff --git a/src/main/kotlin/com/jetbrains/micropython/settings/MicroPythonFacetConfiguration.kt b/src/main/kotlin/com/jetbrains/micropython/settings/MicroPythonFacetConfiguration.kt
index 646d350a..28d4bf02 100644
--- a/src/main/kotlin/com/jetbrains/micropython/settings/MicroPythonFacetConfiguration.kt
+++ b/src/main/kotlin/com/jetbrains/micropython/settings/MicroPythonFacetConfiguration.kt
@@ -38,15 +38,17 @@ class MicroPythonFacetConfiguration : FacetConfiguration {
     return arrayOf(MicroPythonFacetEditorTab(this, facet))
   }
 
+  @Deprecated("Deprecated in Java")
   override fun readExternal(element: Element?) {
     val deviceName = element?.getChild("device")?.getAttribute("name")?.value
     val device = MicroPythonDeviceProvider.providers.firstOrNull { it.persistentName == deviceName }
     deviceProvider = device ?: MicroPythonDeviceProvider.default
   }
 
+  @Deprecated("Deprecated in Java")
   override fun writeExternal(element: Element?) {
     val deviceElement = Element("device")
     deviceElement.setAttribute("name", deviceProvider.persistentName)
     element?.addContent(deviceElement)
   }
-}
\ No newline at end of file
+}