diff --git a/springboot-jdbc-demo/pom.xml b/springboot-jdbc-demo/pom.xml
index 69bb550..94479b6 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>2.5.2</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-jooq-demo/pom.xml b/springboot-jooq-demo/pom.xml
index b64adb6..0be7f1d 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>2.5.2</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-mybatis-demo/pom.xml b/springboot-mybatis-demo/pom.xml
index 7c73296..c574bd9 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>2.5.2</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-solr-demo/pom.xml b/springboot-solr-demo/pom.xml
index 9628201..bea6334 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>2.5.2</version>
 	</parent>
 
 	<properties>
diff --git a/springboot-thymeleaf-demo/pom.xml b/springboot-thymeleaf-demo/pom.xml
index 4d3d13d..43a131c 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>2.5.2</version>
     </parent>
 
     <properties>