diff --git a/build.gradle b/build.gradle
index 95eb05c..46e528e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,13 +1,13 @@
 plugins {
     id 'java'
     id 'idea'
-    id 'org.springframework.boot' version '2.7.18'
-    id 'io.spring.dependency-management' version '1.0.15.RELEASE'
+    id 'org.springframework.boot' version '3.0.13'
+    id 'io.spring.dependency-management' version '1.1.7'
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
 }
 
 jar {
@@ -25,7 +25,8 @@ dependencies {
     }
     implementation 'org.springframework.boot:spring-boot-starter-jetty'
     implementation 'org.springframework.boot:spring-boot-starter-actuator'
-
-    testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
+tasks.withType(Test).configureEach {
+    useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 68e172c..5d6560a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Tue Sep 16 13:45:53 BST 2014
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-1.11-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-all.zip
diff --git a/src/test/java/com/tw/hello/GreeterTest.java b/src/test/java/com/tw/hello/GreeterTest.java
index 9091a99..0873a86 100644
--- a/src/test/java/com/tw/hello/GreeterTest.java
+++ b/src/test/java/com/tw/hello/GreeterTest.java
@@ -1,9 +1,9 @@
 package com.tw.hello;
 
 import com.tw.hello.controller.Greeter;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class GreeterTest {