diff --git a/springboot-jdbc-demo/pom.xml b/springboot-jdbc-demo/pom.xml
index 69bb550..fa31865 100644
--- a/springboot-jdbc-demo/pom.xml
+++ b/springboot-jdbc-demo/pom.xml
@@ -11,7 +11,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>1.3.3.RELEASE</version>
+		<version>2.5.3</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-jooq-demo/pom.xml b/springboot-jooq-demo/pom.xml
index b64adb6..1a630f5 100644
--- a/springboot-jooq-demo/pom.xml
+++ b/springboot-jooq-demo/pom.xml
@@ -11,7 +11,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>1.3.3.RELEASE</version>
+		<version>2.5.3</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-mybatis-demo/pom.xml b/springboot-mybatis-demo/pom.xml
index 7c73296..6035e13 100644
--- a/springboot-mybatis-demo/pom.xml
+++ b/springboot-mybatis-demo/pom.xml
@@ -11,7 +11,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>1.3.3.RELEASE</version>
+		<version>2.5.3</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-solr-demo/pom.xml b/springboot-solr-demo/pom.xml
index 9628201..3be1333 100644
--- a/springboot-solr-demo/pom.xml
+++ b/springboot-solr-demo/pom.xml
@@ -12,7 +12,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>1.3.3.RELEASE</version>
+		<version>2.5.3</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-thymeleaf-demo/pom.xml b/springboot-thymeleaf-demo/pom.xml
index 4d3d13d..36ab7cc 100644
--- a/springboot-thymeleaf-demo/pom.xml
+++ b/springboot-thymeleaf-demo/pom.xml
@@ -11,7 +11,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>1.3.3.RELEASE</version>
+        <version>2.5.3</version>
     </parent>
 
     <properties>