diff --git a/kotlin-web-spring-boot-3-auth/build.gradle.kts b/kotlin-web-spring-boot-3-auth/build.gradle.kts
index d0286f3..b169f13 100644
--- a/kotlin-web-spring-boot-3-auth/build.gradle.kts
+++ b/kotlin-web-spring-boot-3-auth/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
     id("io.spring.dependency-management") version "1.1.4"
     id("com.diffplug.spotless") version "6.25.0"
     id("com.google.cloud.tools.jib") version "3.4.2"
-    kotlin("jvm") version "1.9.23"
+    kotlin("jvm") version "2.1.21"
     kotlin("plugin.spring") version "1.9.23"
     kotlin("plugin.jpa") version "1.9.23"
 }
diff --git a/kotlin-web-spring-boot-3/build.gradle.kts b/kotlin-web-spring-boot-3/build.gradle.kts
index 531aa8f..9149d28 100644
--- a/kotlin-web-spring-boot-3/build.gradle.kts
+++ b/kotlin-web-spring-boot-3/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
     id("io.spring.dependency-management") version "1.1.4"
     id("com.diffplug.spotless") version "6.25.0"
     id("com.google.cloud.tools.jib") version "3.4.2"
-    kotlin("jvm") version "1.9.23"
+    kotlin("jvm") version "2.1.21"
     kotlin("plugin.spring") version "1.9.23"
     kotlin("plugin.jpa") version "1.9.23"
 }
diff --git a/kotlin-webmvc-spring-boot-3/build.gradle.kts b/kotlin-webmvc-spring-boot-3/build.gradle.kts
index ed107d4..c8a2e58 100644
--- a/kotlin-webmvc-spring-boot-3/build.gradle.kts
+++ b/kotlin-webmvc-spring-boot-3/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
     id("io.spring.dependency-management") version "1.1.4"
     id("com.diffplug.spotless") version "6.25.0"
     id("com.google.cloud.tools.jib") version "3.4.2"
-    kotlin("jvm") version "1.9.23"
+    kotlin("jvm") version "2.1.21"
     kotlin("plugin.spring") version "1.9.23"
     kotlin("plugin.jpa") version "1.9.23"
 }