diff --git a/samples/webhook-server-spring-webflux/build.gradle.kts b/samples/webhook-server-spring-webflux/build.gradle.kts
index 86d28d2a..2a49e627 100644
--- a/samples/webhook-server-spring-webflux/build.gradle.kts
+++ b/samples/webhook-server-spring-webflux/build.gradle.kts
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 plugins {
     kotlin("jvm")
     kotlin("plugin.spring")
-    id("org.springframework.boot") version "3.4.5"
+    id("org.springframework.boot") version "4.0.0"
     id("io.spring.dependency-management") version "1.1.7"
 }
 
diff --git a/samples/webhook-server-spring/build.gradle.kts b/samples/webhook-server-spring/build.gradle.kts
index 300ebb37..dca0b8ea 100644
--- a/samples/webhook-server-spring/build.gradle.kts
+++ b/samples/webhook-server-spring/build.gradle.kts
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 plugins {
     kotlin("jvm")
     kotlin("plugin.spring")
-    id("org.springframework.boot") version "3.4.5"
+    id("org.springframework.boot") version "4.0.0"
     id("io.spring.dependency-management") version "1.1.7"
 }