diff --git a/referral/build.gradle.kts b/referral/build.gradle.kts
index 821f056..7a4f37d 100644
--- a/referral/build.gradle.kts
+++ b/referral/build.gradle.kts
@@ -24,5 +24,5 @@ tasks.test {
     useJUnitPlatform()
 }
 kotlin {
-    jvmToolchain(19)
+    jvmToolchain(21)
 }
\ No newline at end of file