diff --git a/pom.xml b/pom.xml
index 0f50398bfb4..f23a192fab4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,6 +57,13 @@
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-test</artifactId>
       <scope>test</scope>
+        <exclusions>
+            <!-- Exclude JUnit 4 from starter-test in favour of JUnit 5 -->
+            <exclusion>
+                <groupId>junit</groupId>
+                <artifactId>junit</artifactId>
+            </exclusion>
+        </exclusions>
     </dependency>
 
     <!-- Databases - Uses HSQL by default -->
@@ -103,6 +110,18 @@
     </dependency>
     <!-- end of webjars -->
 
+    <!-- Testing -->
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-junit-jupiter</artifactId>
+      <scope>test</scope>
+    </dependency>
+
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-devtools</artifactId>
diff --git a/src/test/java/org/springframework/samples/petclinic/PetclinicIntegrationTests.java b/src/test/java/org/springframework/samples/petclinic/PetclinicIntegrationTests.java
index 669dbddaa8d..425172b30bf 100644
--- a/src/test/java/org/springframework/samples/petclinic/PetclinicIntegrationTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/PetclinicIntegrationTests.java
@@ -16,15 +16,11 @@
 
 package org.springframework.samples.petclinic;
 
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.samples.petclinic.vet.VetRepository;
-import org.springframework.test.context.junit4.SpringRunner;
 
-@RunWith(SpringRunner.class)
 @SpringBootTest
 public class PetclinicIntegrationTests {
 
diff --git a/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java b/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java
index e37a9656255..30397742e6e 100644
--- a/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java
@@ -22,8 +22,7 @@
 import javax.validation.ConstraintViolation;
 import javax.validation.Validator;
 
-import org.junit.Test;
-
+import org.junit.jupiter.api.Test;
 import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
 
diff --git a/src/test/java/org/springframework/samples/petclinic/owner/OwnerControllerTests.java b/src/test/java/org/springframework/samples/petclinic/owner/OwnerControllerTests.java
index 5084f424559..899da14716d 100644
--- a/src/test/java/org/springframework/samples/petclinic/owner/OwnerControllerTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/owner/OwnerControllerTests.java
@@ -23,16 +23,13 @@
 import org.assertj.core.util.Lists;
 import org.hamcrest.BaseMatcher;
 import org.hamcrest.Description;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.samples.petclinic.visit.Visit;
 import org.springframework.samples.petclinic.visit.VisitRepository;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 
 import static org.hamcrest.Matchers.empty;
@@ -51,7 +48,6 @@
  *
  * @author Colin But
  */
-@RunWith(SpringRunner.class)
 @WebMvcTest(OwnerController.class)
 public class OwnerControllerTests {
 
@@ -68,7 +64,7 @@ public class OwnerControllerTests {
 
     private Owner george;
 
-    @Before
+    @BeforeEach
     public void setup() {
         george = new Owner();
         george.setId(TEST_OWNER_ID);
diff --git a/src/test/java/org/springframework/samples/petclinic/owner/PetControllerTests.java b/src/test/java/org/springframework/samples/petclinic/owner/PetControllerTests.java
index 2ffae30255d..4c0d695388a 100755
--- a/src/test/java/org/springframework/samples/petclinic/owner/PetControllerTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/owner/PetControllerTests.java
@@ -24,22 +24,13 @@
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
 
 import org.assertj.core.util.Lists;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.FilterType;
-import org.springframework.samples.petclinic.owner.Owner;
-import org.springframework.samples.petclinic.owner.OwnerRepository;
-import org.springframework.samples.petclinic.owner.Pet;
-import org.springframework.samples.petclinic.owner.PetController;
-import org.springframework.samples.petclinic.owner.PetRepository;
-import org.springframework.samples.petclinic.owner.PetType;
-import org.springframework.samples.petclinic.owner.PetTypeFormatter;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 
 /**
@@ -47,7 +38,6 @@
  *
  * @author Colin But
  */
-@RunWith(SpringRunner.class)
 @WebMvcTest(value = PetController.class,
     includeFilters = @ComponentScan.Filter(
                             value = PetTypeFormatter.class,
@@ -67,7 +57,7 @@ public class PetControllerTests {
     @MockBean
     private OwnerRepository owners;
 
-    @Before
+    @BeforeEach
     public void setup() {
         PetType cat = new PetType();
         cat.setId(3);
diff --git a/src/test/java/org/springframework/samples/petclinic/owner/PetTypeFormatterTests.java b/src/test/java/org/springframework/samples/petclinic/owner/PetTypeFormatterTests.java
index 9ba43148019..af98b5cfda8 100644
--- a/src/test/java/org/springframework/samples/petclinic/owner/PetTypeFormatterTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/owner/PetTypeFormatterTests.java
@@ -22,11 +22,12 @@
 import java.util.List;
 import java.util.Locale;
 
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;
-import org.mockito.junit.MockitoJUnitRunner;
+import org.mockito.junit.jupiter.MockitoExtension;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.BDDMockito.given;
@@ -36,7 +37,7 @@
  *
  * @author Colin But
  */
-@RunWith(MockitoJUnitRunner.class)
+@ExtendWith(MockitoExtension.class)
 public class PetTypeFormatterTests {
 
     @Mock
@@ -44,7 +45,7 @@ public class PetTypeFormatterTests {
 
     private PetTypeFormatter petTypeFormatter;
 
-    @Before
+    @BeforeEach
     public void setup() {
         this.petTypeFormatter = new PetTypeFormatter(pets);
     }
@@ -64,10 +65,12 @@ public void shouldParse() throws ParseException {
         assertThat(petType.getName()).isEqualTo("Bird");
     }
 
-    @Test(expected = ParseException.class)
+    @Test
     public void shouldThrowParseException() throws ParseException {
         given(this.pets.findPetTypes()).willReturn(makePetTypes());
-        petTypeFormatter.parse("Fish", Locale.ENGLISH);
+        Assertions.assertThrows(ParseException.class, () -> {
+            petTypeFormatter.parse("Fish", Locale.ENGLISH);
+        });
     }
 
     /**
diff --git a/src/test/java/org/springframework/samples/petclinic/owner/VisitControllerTests.java b/src/test/java/org/springframework/samples/petclinic/owner/VisitControllerTests.java
index 3edd2095933..93f30b9aa6a 100644
--- a/src/test/java/org/springframework/samples/petclinic/owner/VisitControllerTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/owner/VisitControllerTests.java
@@ -23,17 +23,12 @@
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
 
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.MockBean;
-import org.springframework.samples.petclinic.owner.Pet;
-import org.springframework.samples.petclinic.owner.PetRepository;
-import org.springframework.samples.petclinic.owner.VisitController;
 import org.springframework.samples.petclinic.visit.VisitRepository;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 
 /**
@@ -41,7 +36,6 @@
  *
  * @author Colin But
  */
-@RunWith(SpringRunner.class)
 @WebMvcTest(VisitController.class)
 public class VisitControllerTests {
 
@@ -56,7 +50,7 @@ public class VisitControllerTests {
     @MockBean
     private PetRepository pets;
 
-    @Before
+    @BeforeEach
     public void init() {
         given(this.pets.findById(TEST_PET_ID)).willReturn(new Pet());
     }
diff --git a/src/test/java/org/springframework/samples/petclinic/service/ClinicServiceTests.java b/src/test/java/org/springframework/samples/petclinic/service/ClinicServiceTests.java
index c103caac0c4..562025de926 100644
--- a/src/test/java/org/springframework/samples/petclinic/service/ClinicServiceTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/service/ClinicServiceTests.java
@@ -21,8 +21,8 @@
 import java.time.LocalDate;
 import java.util.Collection;
 
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.context.annotation.ComponentScan;
@@ -36,7 +36,6 @@
 import org.springframework.samples.petclinic.visit.Visit;
 import org.springframework.samples.petclinic.visit.VisitRepository;
 import org.springframework.stereotype.Service;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.transaction.annotation.Transactional;
 
 /**
@@ -60,7 +59,6 @@
  * @author Dave Syer
  */
 
-@RunWith(SpringRunner.class)
 @DataJpaTest(includeFilters = @ComponentScan.Filter(Service.class))
 public class ClinicServiceTests {
 
diff --git a/src/test/java/org/springframework/samples/petclinic/system/CrashControllerTests.java b/src/test/java/org/springframework/samples/petclinic/system/CrashControllerTests.java
index cc1e235cb73..b38a7840d6c 100644
--- a/src/test/java/org/springframework/samples/petclinic/system/CrashControllerTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/system/CrashControllerTests.java
@@ -16,13 +16,10 @@
 
 package org.springframework.samples.petclinic.system;
 
-import org.junit.Ignore;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
@@ -36,9 +33,8 @@
  *
  * @author Colin But
  */
-@RunWith(SpringRunner.class)
 // Waiting https://github.com/spring-projects/spring-boot/issues/5574
-@Ignore
+@Disabled
 @WebMvcTest(controllers = CrashController.class)
 public class CrashControllerTests {
 
diff --git a/src/test/java/org/springframework/samples/petclinic/vet/VetControllerTests.java b/src/test/java/org/springframework/samples/petclinic/vet/VetControllerTests.java
index 145c6159690..c3681f88ffd 100644
--- a/src/test/java/org/springframework/samples/petclinic/vet/VetControllerTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/vet/VetControllerTests.java
@@ -25,21 +25,18 @@
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
 
 import org.assertj.core.util.Lists;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.http.MediaType;
-import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.ResultActions;
 
 /**
  * Test class for the {@link VetController}
  */
-@RunWith(SpringRunner.class)
 @WebMvcTest(VetController.class)
 public class VetControllerTests {
 
@@ -49,7 +46,7 @@ public class VetControllerTests {
     @MockBean
     private VetRepository vets;
 
-    @Before
+    @BeforeEach
     public void setup() {
         Vet james = new Vet();
         james.setFirstName("James");
diff --git a/src/test/java/org/springframework/samples/petclinic/vet/VetTests.java b/src/test/java/org/springframework/samples/petclinic/vet/VetTests.java
index 54225075176..0e32c531f21 100644
--- a/src/test/java/org/springframework/samples/petclinic/vet/VetTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/vet/VetTests.java
@@ -15,8 +15,7 @@
  */
 package org.springframework.samples.petclinic.vet;
 
-import org.junit.Test;
-
+import org.junit.jupiter.api.Test;
 import org.springframework.util.SerializationUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;