diff --git a/pom.xml b/pom.xml
index 4d77197..1d92727 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,23 +30,24 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<java.version>21</java.version>
+		<spring.version>3.3.2</spring.version>
 	</properties>
 
 	<dependencies>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot</artifactId>
-			<version>3.3.2</version>
+			<version>${spring.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
-			<version>3.3.2</version>
+			<version>${spring.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-tomcat</artifactId>
-			<version>3.3.2</version>
+			<version>${spring.version}</version>
 			<scope>provided</scope>
 		</dependency>
 		<dependency>
@@ -83,7 +84,7 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
-			<version>3.3.2</version>
+			<version>${spring.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>junit</groupId>
diff --git a/src/test/java/com/ironoc/portfolio/AppTest.java b/src/test/java/com/ironoc/portfolio/AppTest.java
index 50d7232..3e4fcf0 100644
--- a/src/test/java/com/ironoc/portfolio/AppTest.java
+++ b/src/test/java/com/ironoc/portfolio/AppTest.java
@@ -1,15 +1,12 @@
 package com.ironoc.portfolio;
 
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
 import org.mockito.MockedStatic;
-import org.mockito.junit.MockitoJUnitRunner;
 import org.springframework.boot.SpringApplication;
 
 import static org.mockito.Mockito.mockStatic;
 import static org.mockito.Mockito.times;
 
-@RunWith(MockitoJUnitRunner.class)
 public class AppTest {
 
     // mocks
diff --git a/src/test/java/com/ironoc/portfolio/config/IronocMvcConfigTest.java b/src/test/java/com/ironoc/portfolio/config/IronocMvcConfigTest.java
index 0d5d2c7..c749158 100644
--- a/src/test/java/com/ironoc/portfolio/config/IronocMvcConfigTest.java
+++ b/src/test/java/com/ironoc/portfolio/config/IronocMvcConfigTest.java
@@ -1,12 +1,12 @@
 package com.ironoc.portfolio.config;
 
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.ArgumentCaptor;
 import org.mockito.ArgumentMatchers;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
-import org.mockito.junit.MockitoJUnitRunner;
+import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.boot.web.server.WebServerFactoryCustomizer;
 import org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory;
 import org.springframework.web.servlet.ViewResolver;
@@ -22,7 +22,7 @@
 import static org.hamcrest.Matchers.notNullValue;
 import static org.mockito.Mockito.*;
 
-@RunWith(MockitoJUnitRunner.class)
+@ExtendWith(MockitoExtension.class)
 public class IronocMvcConfigTest {
 
     @InjectMocks
diff --git a/src/test/java/com/ironoc/portfolio/controller/CustomErrorControllerTest.java b/src/test/java/com/ironoc/portfolio/controller/CustomErrorControllerTest.java
index f908a61..721a497 100644
--- a/src/test/java/com/ironoc/portfolio/controller/CustomErrorControllerTest.java
+++ b/src/test/java/com/ironoc/portfolio/controller/CustomErrorControllerTest.java
@@ -2,18 +2,18 @@
 
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
-import org.mockito.junit.MockitoJUnitRunner;
+import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.web.servlet.view.RedirectView;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
 import static org.mockito.Mockito.verify;
 
-@RunWith(MockitoJUnitRunner.class)
+@ExtendWith(MockitoExtension.class)
 public class CustomErrorControllerTest {
 
     @InjectMocks
diff --git a/src/test/java/com/ironoc/portfolio/controller/HomeControllerTest.java b/src/test/java/com/ironoc/portfolio/controller/HomeControllerTest.java
index 8f99039..6ef625e 100644
--- a/src/test/java/com/ironoc/portfolio/controller/HomeControllerTest.java
+++ b/src/test/java/com/ironoc/portfolio/controller/HomeControllerTest.java
@@ -1,18 +1,18 @@
 package com.ironoc.portfolio.controller;
 
 import jakarta.servlet.http.HttpServletRequest;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
-import org.mockito.junit.MockitoJUnitRunner;
+import org.mockito.junit.jupiter.MockitoExtension;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.mockito.Mockito.*;
 
-@RunWith(MockitoJUnitRunner.class)
+@ExtendWith(MockitoExtension.class)
 public class HomeControllerTest {
 
     @InjectMocks