diff --git a/api-gateway/pom.xml b/api-gateway/pom.xml
index 15d00ac..2a1973a 100644
--- a/api-gateway/pom.xml
+++ b/api-gateway/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.6</version>
+        <version>4.0.0</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.sivalabs.bookstore</groupId>
diff --git a/bookstore-webapp/pom.xml b/bookstore-webapp/pom.xml
index 8216ba7..0f4f5c2 100644
--- a/bookstore-webapp/pom.xml
+++ b/bookstore-webapp/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.6</version>
+        <version>4.0.0</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.sivalabs</groupId>
diff --git a/catalog-service/pom.xml b/catalog-service/pom.xml
index ceb2a3e..d65e640 100644
--- a/catalog-service/pom.xml
+++ b/catalog-service/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.6</version>
+		<version>4.0.0</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>com.sivalabs</groupId>
diff --git a/notification-service/pom.xml b/notification-service/pom.xml
index d098f21..ab9fcdb 100644
--- a/notification-service/pom.xml
+++ b/notification-service/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.6</version>
+        <version>4.0.0</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.sivalabs</groupId>
diff --git a/order-service/pom.xml b/order-service/pom.xml
index cb32499..a909d4c 100644
--- a/order-service/pom.xml
+++ b/order-service/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.6</version>
+		<version>4.0.0</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>com.sivalabs</groupId>