diff --git a/examples/kotlin/build.gradle.kts b/examples/kotlin/build.gradle.kts
index 2ea445a..df0ed56 100644
--- a/examples/kotlin/build.gradle.kts
+++ b/examples/kotlin/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     id("application")
     id("com.github.ben-manes.versions") version "0.51.0"
@@ -28,6 +30,12 @@ repositories {
     maven { url = uri("https://oss.sonatype.org/content/repositories/snapshots") }
 }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 application {
     mainClass.set("com.example.App")
 }