diff --git a/samples/sample-spring-boot-echo-kotlin/build.gradle.kts b/samples/sample-spring-boot-echo-kotlin/build.gradle.kts
index 895f40c60..3215e193f 100644
--- a/samples/sample-spring-boot-echo-kotlin/build.gradle.kts
+++ b/samples/sample-spring-boot-echo-kotlin/build.gradle.kts
@@ -19,7 +19,7 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 plugins {
     id("sdk.java-library")
     id("sdk.spring-boot")
-    kotlin("jvm") version "2.4.20"
+    kotlin("jvm") version "2.4.21"
     kotlin("plugin.spring") version "2.4.21"
 }