diff --git a/input-sample/build.gradle.kts b/input-sample/build.gradle.kts
index cbf3af9be..8187a1c92 100644
--- a/input-sample/build.gradle.kts
+++ b/input-sample/build.gradle.kts
@@ -17,6 +17,7 @@ application {
 tasks.getByName("run", JavaExec::class).standardInput = System.`in`
 
 kotlin {
+    jvmToolchain(17)
     jvm {
         withJava()
         testRuns["test"].executionTask.configure {
diff --git a/player-sample/build.gradle.kts b/player-sample/build.gradle.kts
index c39982ef1..58014e8c1 100644
--- a/player-sample/build.gradle.kts
+++ b/player-sample/build.gradle.kts
@@ -18,6 +18,7 @@ application {
 tasks.getByName("run", JavaExec::class).standardInput = System.`in`
 
 kotlin {
+    jvmToolchain(17)
     jvm {
         withJava()
         testRuns["test"].executionTask.configure {