diff --git a/README.md b/README.md
index 5b7722b..8b4633c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ![CI](https://github.com/rogervinas/spring-cloud-stream-kafka-step-by-step/actions/workflows/gradle.yml/badge.svg)
 ![Java](https://img.shields.io/badge/Java-21-blue?labelColor=black)
-![Kotlin](https://img.shields.io/badge/Kotlin-1.9.20-blue?labelColor=black)
+![Kotlin](https://img.shields.io/badge/Kotlin-1.9.21-blue?labelColor=black)
 ![SpringBoot](https://img.shields.io/badge/SpringBoot-3.2.0-blue?labelColor=black)
 ![SpringCloudStream](https://img.shields.io/badge/SpringCloudStream-4.0.4-blue?labelColor=black)
 
diff --git a/build.gradle.kts b/build.gradle.kts
index fa79f13..629e60e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -5,7 +5,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 plugins {
   id("org.springframework.boot") version "3.2.0"
   id("io.spring.dependency-management") version "1.1.4"
-  kotlin("jvm") version "1.9.20"
+  kotlin("jvm") version "1.9.21"
   kotlin("plugin.spring") version "1.9.21"
 }