diff --git a/build.gradle b/build.gradle
index a80a6e710..43efd3462 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,6 @@
 plugins {
   id 'java'
-  id 'org.springframework.boot' version '3.5.0'
+  id 'org.springframework.boot' version '4.0.0-SNAPSHOT'
   id 'io.spring.dependency-management' version '1.1.7'
   id 'org.graalvm.buildtools.native' version '0.10.6'
   id 'org.cyclonedx.bom' version '2.3.1'
@@ -15,7 +15,7 @@ apply plugin: 'io.spring.javaformat'
 gradle.startParameter.excludedTaskNames += [ "checkFormatAot", "checkFormatAotTest" ]
 
 group = 'org.springframework.samples'
-version = '3.5.0'
+version = '4.0.0-SNAPSHOT'
 
 java {
   sourceCompatibility = JavaVersion.VERSION_17
@@ -23,6 +23,12 @@ java {
 
 repositories {
   mavenCentral()
+  maven {
+    url = "https://repo.spring.io/milestone"
+  }
+  maven {
+    url = "https://repo.spring.io/snapshot"
+  }
 }
 
 ext.checkstyleVersion = "10.25.0"
diff --git a/pom.xml b/pom.xml
index 8576c22ba..555348648 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,13 +5,13 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.5.0</version>
+    <version>4.0.0-SNAPSHOT</version>
     <relativePath></relativePath>
   </parent>
 
   <groupId>org.springframework.samples</groupId>
   <artifactId>spring-petclinic</artifactId>
-  <version>3.5.0-SNAPSHOT</version>
+  <version>4.0.0-SNAPSHOT</version>
 
   <name>petclinic</name>
 
diff --git a/settings.gradle b/settings.gradle
index e60ee14fa..ede16e124 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1 +1,9 @@
+pluginManagement {
+	repositories {
+		gradlePluginPortal()
+		maven {
+			url = "https://repo.spring.io/snapshot"
+		}
+	}
+}
 rootProject.name = 'spring-petclinic'
diff --git a/src/main/java/org/springframework/samples/petclinic/system/CacheConfiguration.java b/src/main/java/org/springframework/samples/petclinic/system/CacheConfiguration.java
index 1382f3aea..13cb74301 100644
--- a/src/main/java/org/springframework/samples/petclinic/system/CacheConfiguration.java
+++ b/src/main/java/org/springframework/samples/petclinic/system/CacheConfiguration.java
@@ -16,7 +16,7 @@
 
 package org.springframework.samples.petclinic.system;
 
-import org.springframework.boot.autoconfigure.cache.JCacheManagerCustomizer;
+import org.springframework.boot.cache.autoconfigure.JCacheManagerCustomizer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
diff --git a/src/test/java/org/springframework/samples/petclinic/MySqlIntegrationTests.java b/src/test/java/org/springframework/samples/petclinic/MySqlIntegrationTests.java
index a78e2e6e1..e7e8ac607 100644
--- a/src/test/java/org/springframework/samples/petclinic/MySqlIntegrationTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/MySqlIntegrationTests.java
@@ -23,9 +23,9 @@ import org.junit.jupiter.api.condition.DisabledInNativeImage;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
-import org.springframework.boot.test.web.server.LocalServerPort;
 import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
-import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.boot.restclient.RestTemplateBuilder;
+import org.springframework.boot.web.server.test.LocalServerPort;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.RequestEntity;
 import org.springframework.http.ResponseEntity;
diff --git a/src/test/java/org/springframework/samples/petclinic/PetClinicIntegrationTests.java b/src/test/java/org/springframework/samples/petclinic/PetClinicIntegrationTests.java
index 617af9652..42329177a 100644
--- a/src/test/java/org/springframework/samples/petclinic/PetClinicIntegrationTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/PetClinicIntegrationTests.java
@@ -23,8 +23,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
-import org.springframework.boot.test.web.server.LocalServerPort;
-import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.boot.restclient.RestTemplateBuilder;
+import org.springframework.boot.web.server.test.LocalServerPort;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.RequestEntity;
 import org.springframework.http.ResponseEntity;
diff --git a/src/test/java/org/springframework/samples/petclinic/PostgresIntegrationTests.java b/src/test/java/org/springframework/samples/petclinic/PostgresIntegrationTests.java
index 709d33e66..a9b51c07b 100644
--- a/src/test/java/org/springframework/samples/petclinic/PostgresIntegrationTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/PostgresIntegrationTests.java
@@ -32,10 +32,10 @@ import org.junit.jupiter.api.condition.DisabledInNativeImage;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.boot.context.event.ApplicationPreparedEvent;
+import org.springframework.boot.restclient.RestTemplateBuilder;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
-import org.springframework.boot.test.web.server.LocalServerPort;
-import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.boot.web.server.test.LocalServerPort;
 import org.springframework.context.ApplicationListener;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.EnumerablePropertySource;
diff --git a/src/test/java/org/springframework/samples/petclinic/system/CrashControllerIntegrationTests.java b/src/test/java/org/springframework/samples/petclinic/system/CrashControllerIntegrationTests.java
index ed8b0819a..2d1ac0dd0 100644
--- a/src/test/java/org/springframework/samples/petclinic/system/CrashControllerIntegrationTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/system/CrashControllerIntegrationTests.java
@@ -26,11 +26,11 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
-import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
-import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
+import org.springframework.boot.hibernate.autoconfigure.HibernateJpaAutoConfiguration;
+import org.springframework.boot.jdbc.autoconfigure.DataSourceAutoConfiguration;
+import org.springframework.boot.jdbc.autoconfigure.DataSourceTransactionManagerAutoConfiguration;
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.test.client.TestRestTemplate;
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;