diff --git a/async-datastore/pom.xml b/async-datastore/pom.xml
index f69d064..5edb815 100644
--- a/async-datastore/pom.xml
+++ b/async-datastore/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-async-datastore</artifactId>
diff --git a/async-http/pom.xml b/async-http/pom.xml
index f8598d1..f6523ef 100644
--- a/async-http/pom.xml
+++ b/async-http/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-async-http</artifactId>
diff --git a/auth-jwt/pom.xml b/auth-jwt/pom.xml
index ab176ab..c69a0a8 100644
--- a/auth-jwt/pom.xml
+++ b/auth-jwt/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-auth-jwt</artifactId>
diff --git a/auth/pom.xml b/auth/pom.xml
index ba75da3..44782e3 100644
--- a/auth/pom.xml
+++ b/auth/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-auth</artifactId>
diff --git a/bom-platform/pom.xml b/bom-platform/pom.xml
index 523fe0c..18ac008 100644
--- a/bom-platform/pom.xml
+++ b/bom-platform/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-bom-platform</artifactId>
diff --git a/bom/pom.xml b/bom/pom.xml
index 8d69577..1cf15df 100644
--- a/bom/pom.xml
+++ b/bom/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-bom</artifactId>
diff --git a/core/pom.xml b/core/pom.xml
index 0f12559..fd70c87 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-core</artifactId>
diff --git a/documentation/pom.xml b/documentation/pom.xml
index 01fdf12..b521b44 100644
--- a/documentation/pom.xml
+++ b/documentation/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>documentation-core</artifactId>
diff --git a/http/pom.xml b/http/pom.xml
index f616c96..09a7873 100644
--- a/http/pom.xml
+++ b/http/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-http</artifactId>
diff --git a/pom.xml b/pom.xml
index f7d1119..17889b9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,6 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
@@ -11,7 +9,7 @@
 
 	<groupId>com.holon-platform.core</groupId>
 	<artifactId>holon-root</artifactId>
-	<version>5.2.1-SNAPSHOT</version>
+	<version>5.2.1</version>
 	<packaging>pom</packaging>
 
 	<name>${project.groupId}:${project.artifactId}</name>
@@ -50,7 +48,7 @@
 		<connection>scm:git:https://github.com/holon-platform/holon-core.git</connection>
 		<url>https://github.com/holon-platform/holon-core</url>
 		<developerConnection>scm:git:https://github.com/holon-platform/holon-core.git</developerConnection>
-		<tag>HEAD</tag>
+		<tag>5.2.1</tag>
 	</scm>
 
 	<properties>
diff --git a/spring-boot/pom.xml b/spring-boot/pom.xml
index b31c674..0a70bd9 100644
--- a/spring-boot/pom.xml
+++ b/spring-boot/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-spring-boot</artifactId>
diff --git a/spring-security/pom.xml b/spring-security/pom.xml
index 88315b9..60557dd 100644
--- a/spring-security/pom.xml
+++ b/spring-security/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-spring-security</artifactId>
diff --git a/spring/pom.xml b/spring/pom.xml
index 437a4a8..45b8240 100644
--- a/spring/pom.xml
+++ b/spring/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-spring</artifactId>
diff --git a/starter-security/pom.xml b/starter-security/pom.xml
index 3292dba..fb256ff 100644
--- a/starter-security/pom.xml
+++ b/starter-security/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-starter-security</artifactId>
diff --git a/starter-test/pom.xml b/starter-test/pom.xml
index b243127..f6554da 100644
--- a/starter-test/pom.xml
+++ b/starter-test/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-starter-test</artifactId>
diff --git a/starter/pom.xml b/starter/pom.xml
index 5e78308..a3cc632 100644
--- a/starter/pom.xml
+++ b/starter/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-starter</artifactId>
diff --git a/test/pom.xml b/test/pom.xml
index 7756ea1..4c89781 100644
--- a/test/pom.xml
+++ b/test/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.core</groupId>
 		<artifactId>holon-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-test</artifactId>