diff --git a/spring-boot-docker-build/pom.xml b/spring-boot-docker-build/pom.xml
index e712bc1..8d412d9 100644
--- a/spring-boot-docker-build/pom.xml
+++ b/spring-boot-docker-build/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.1.1.RELEASE</version>
+        <version>4.0.4</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/spring-rest-api-client-auth/pom.xml b/spring-rest-api-client-auth/pom.xml
index 8aefdb3..d234a78 100644
--- a/spring-rest-api-client-auth/pom.xml
+++ b/spring-rest-api-client-auth/pom.xml
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.5.RELEASE</version>
+		<version>4.0.4</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
diff --git a/spring-rest-data-exploit/pom.xml b/spring-rest-data-exploit/pom.xml
index 133b976..8c338f8 100644
--- a/spring-rest-data-exploit/pom.xml
+++ b/spring-rest-data-exploit/pom.xml
@@ -14,7 +14,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>1.4.0.RELEASE</version>
+        <version>4.0.4</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/spring-security-radius-login/pom.xml b/spring-security-radius-login/pom.xml
index 0d0d1b0..d06a931 100644
--- a/spring-security-radius-login/pom.xml
+++ b/spring-security-radius-login/pom.xml
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.4.RELEASE</version>
+		<version>4.0.4</version>
 		<relativePath /> <!-- lookup parent from repository -->
 	</parent>
 
diff --git a/spring-sftp-download-demo/pom.xml b/spring-sftp-download-demo/pom.xml
index c0c5c14..0f66a65 100644
--- a/spring-sftp-download-demo/pom.xml
+++ b/spring-sftp-download-demo/pom.xml
@@ -14,7 +14,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>4.0.4</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/spring-sftp-upload-demo/pom.xml b/spring-sftp-upload-demo/pom.xml
index e5e10ca..61241be 100644
--- a/spring-sftp-upload-demo/pom.xml
+++ b/spring-sftp-upload-demo/pom.xml
@@ -14,7 +14,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>4.0.4</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/spring-shell-port-scanner/pom.xml b/spring-shell-port-scanner/pom.xml
index 862a80c..0842b84 100644
--- a/spring-shell-port-scanner/pom.xml
+++ b/spring-shell-port-scanner/pom.xml
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.5.RELEASE</version>
+		<version>4.0.4</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
diff --git a/spring-web-ssl-client-auth/pom.xml b/spring-web-ssl-client-auth/pom.xml
index f67ab70..33db0a3 100644
--- a/spring-web-ssl-client-auth/pom.xml
+++ b/spring-web-ssl-client-auth/pom.xml
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.5.RELEASE</version>
+		<version>4.0.4</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>