diff --git a/examples/kotlin/build.gradle.kts b/examples/kotlin/build.gradle.kts
index 5ec57e8..514316b 100644
--- a/examples/kotlin/build.gradle.kts
+++ b/examples/kotlin/build.gradle.kts
@@ -27,6 +27,12 @@ repositories {
     mavenCentral()
 }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 application {
     mainClass.set("com.example.MainKt")
 //    project.afterEvaluate {