diff --git a/spring-batch-db-examples/pom.xml b/spring-batch-db-examples/pom.xml
index 6713311..1d324fd 100644
--- a/spring-batch-db-examples/pom.xml
+++ b/spring-batch-db-examples/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.8</version>
+		<version>4.0.0</version>
 		<relativePath/>
 	</parent>
 
@@ -21,7 +21,7 @@
 		<java.version>21</java.version>
         <lombok.version>1.18.42</lombok.version>
         <h2.version>2.4.240</h2.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <spring.batch.version>5.2.4</spring.batch.version>
         <maven.compiler.plugin.version>3.14.1</maven.compiler.plugin.version>
         <instancio.version>5.5.1</instancio.version>
diff --git a/spring-batch-file-examples/pom.xml b/spring-batch-file-examples/pom.xml
index fb83347..a35add3 100644
--- a/spring-batch-file-examples/pom.xml
+++ b/spring-batch-file-examples/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.8</version>
+		<version>4.0.0</version>
 		<relativePath/>
 	</parent>
 
@@ -20,7 +20,7 @@
 	<properties>
 		<java.version>21</java.version>
         <lombok.version>1.18.42</lombok.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <spring.batch.version>5.2.4</spring.batch.version>
         <maven.compiler.plugin.version>3.14.1</maven.compiler.plugin.version>
         <instancio.version>5.5.1</instancio.version>
diff --git a/spring-jasper-example/pom.xml b/spring-jasper-example/pom.xml
index 3e9a0a0..9b5002c 100644
--- a/spring-jasper-example/pom.xml
+++ b/spring-jasper-example/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.8</version>
+		<version>4.0.0</version>
 		<relativePath/>
 	</parent>
 
@@ -19,7 +19,7 @@
 
 	<properties>
 		<java.version>21</java.version>
-		<spring.boot.version>3.5.8</spring.boot.version>
+		<spring.boot.version>4.0.0</spring.boot.version>
 		<jasper.version>7.0.3</jasper.version>
         <lombok.version>1.18.42</lombok.version>
     </properties>
diff --git a/spring-kafka-example/pom.xml b/spring-kafka-example/pom.xml
index 41bb432..7140e18 100644
--- a/spring-kafka-example/pom.xml
+++ b/spring-kafka-example/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.8</version>
+		<version>4.0.0</version>
 		<relativePath/>
 	</parent>
 
@@ -20,7 +20,7 @@
 
 	<properties>
 		<java.version>21</java.version>
-		<spring.boot.version>3.5.8</spring.boot.version>
+		<spring.boot.version>4.0.0</spring.boot.version>
 		<spring.kafka.version>3.3.11</spring.kafka.version>
 		<lombok.version>1.18.42</lombok.version>
 		<jakarta.validation.version>3.1.1</jakarta.validation.version>
diff --git a/spring-keycloak-example/pom.xml b/spring-keycloak-example/pom.xml
index d47c411..72413cf 100644
--- a/spring-keycloak-example/pom.xml
+++ b/spring-keycloak-example/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.8</version>
+		<version>4.0.0</version>
 		<relativePath/>
 	</parent>
 
@@ -19,7 +19,7 @@
 
 	<properties>
 		<java.version>21</java.version>
-		<spring.boot.version>3.5.8</spring.boot.version>
+		<spring.boot.version>4.0.0</spring.boot.version>
 		<spring.security.version>7.0.0</spring.security.version>
 		<lombok.version>1.18.42</lombok.version>
 		<maven.plugins.version>3.14.1</maven.plugins.version>
diff --git a/spring-multimodule-example/module-b-example/pom.xml b/spring-multimodule-example/module-b-example/pom.xml
index e3597dd..684d516 100644
--- a/spring-multimodule-example/module-b-example/pom.xml
+++ b/spring-multimodule-example/module-b-example/pom.xml
@@ -15,7 +15,7 @@
 
     <properties>
         <java.version>21</java.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
     </properties>
 
     <dependencies>
diff --git a/spring-multimodule-example/pom.xml b/spring-multimodule-example/pom.xml
index 9f1f74e..6f2d28f 100644
--- a/spring-multimodule-example/pom.xml
+++ b/spring-multimodule-example/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.8</version>
+        <version>4.0.0</version>
         <relativePath/>
     </parent>
 
@@ -17,7 +17,7 @@
 
     <properties>
         <java.version>21</java.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
     </properties>
 
     <modules>
diff --git a/spring-mysql-example/pom.xml b/spring-mysql-example/pom.xml
index 9deedd3..5348528 100644
--- a/spring-mysql-example/pom.xml
+++ b/spring-mysql-example/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.8</version>
+        <version>4.0.0</version>
         <relativePath/>
     </parent>
 
@@ -18,7 +18,7 @@
 
     <properties>
         <java.version>21</java.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <maven.compiler.plugin.version>3.14.1</maven.compiler.plugin.version>
         <mysql.version>9.5.0</mysql.version>
         <h2database.version>2.4.240</h2database.version>
diff --git a/spring-oracle-example/pom.xml b/spring-oracle-example/pom.xml
index 6154dae..e7ad9ba 100644
--- a/spring-oracle-example/pom.xml
+++ b/spring-oracle-example/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.8</version>
+        <version>4.0.0</version>
         <relativePath/>
     </parent>
 
@@ -18,7 +18,7 @@
 
     <properties>
         <java.version>21</java.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <lombok.version>1.18.42</lombok.version>
         <oracle.database.version>23.26.0.0.0</oracle.database.version>
         <maven.compiler.plugin.version>3.14.1</maven.compiler.plugin.version>
diff --git a/spring-postgres-example/pom.xml b/spring-postgres-example/pom.xml
index 0711950..7e7f6cd 100644
--- a/spring-postgres-example/pom.xml
+++ b/spring-postgres-example/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.8</version>
+        <version>4.0.0</version>
         <relativePath/>
     </parent>
 
@@ -18,7 +18,7 @@
 
     <properties>
         <java.version>21</java.version>
-        <spring.boot.version>3.5.8</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <maven.compiler.plugin.version>3.14.1</maven.compiler.plugin.version>
         <mysql.version>9.4.0</mysql.version>
         <h2database.version>2.4.240</h2database.version>
diff --git a/spring-prometheus-grafana-example/pom.xml b/spring-prometheus-grafana-example/pom.xml
index fd379cf..3b28fc4 100644
--- a/spring-prometheus-grafana-example/pom.xml
+++ b/spring-prometheus-grafana-example/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.8</version>
+		<version>4.0.0</version>
 		<relativePath/>
 	</parent>
 
@@ -19,7 +19,7 @@
 
 	<properties>
 		<java.version>21</java.version>
-		<spring.boot.version>3.5.8</spring.boot.version>
+		<spring.boot.version>4.0.0</spring.boot.version>
 		<io.micrometer.version>1.16.0</io.micrometer.version>
 	</properties>