diff --git a/bom-platform/pom.xml b/bom-platform/pom.xml
index 6f5e950..97849ae 100644
--- a/bom-platform/pom.xml
+++ b/bom-platform/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-json-bom-platform</artifactId>
diff --git a/bom/pom.xml b/bom/pom.xml
index eb48388..96a74ed 100644
--- a/bom/pom.xml
+++ b/bom/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-json-bom</artifactId>
diff --git a/documentation/pom.xml b/documentation/pom.xml
index e1adbce..eeba864 100644
--- a/documentation/pom.xml
+++ b/documentation/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-    <version>5.2.1-SNAPSHOT</version>
+    <version>5.2.1</version>
 	</parent>
 
 	<artifactId>documentation-json</artifactId>
diff --git a/gson-jaxrs/pom.xml b/gson-jaxrs/pom.xml
index b5979a5..a9c1939 100644
--- a/gson-jaxrs/pom.xml
+++ b/gson-jaxrs/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.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-gson-jaxrs</artifactId>
diff --git a/gson-spring/pom.xml b/gson-spring/pom.xml
index 3611427..67056d3 100644
--- a/gson-spring/pom.xml
+++ b/gson-spring/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-gson-spring</artifactId>
diff --git a/gson/pom.xml b/gson/pom.xml
index 3d9b9a8..cea2599 100644
--- a/gson/pom.xml
+++ b/gson/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.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-gson</artifactId>
diff --git a/jackson-jaxrs/pom.xml b/jackson-jaxrs/pom.xml
index f91be8a..df08b06 100644
--- a/jackson-jaxrs/pom.xml
+++ b/jackson-jaxrs/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.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-jackson-jaxrs</artifactId>
diff --git a/jackson-spring/pom.xml b/jackson-spring/pom.xml
index b5da6ec..961cecf 100644
--- a/jackson-spring/pom.xml
+++ b/jackson-spring/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>com.holon-platform.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-jackson-spring</artifactId>
diff --git a/jackson/pom.xml b/jackson/pom.xml
index 0452a64..a9100ba 100644
--- a/jackson/pom.xml
+++ b/jackson/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.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-jackson</artifactId>
diff --git a/json/pom.xml b/json/pom.xml
index eb11995..7c6a11c 100644
--- a/json/pom.xml
+++ b/json/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.json</groupId>
 		<artifactId>holon-json-root</artifactId>
-		<version>5.2.1-SNAPSHOT</version>
+		<version>5.2.1</version>
 	</parent>
 
 	<artifactId>holon-json</artifactId>
diff --git a/pom.xml b/pom.xml
index 61ab657..a959254 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.json</groupId>
 	<artifactId>holon-json-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-json.git</connection>
 		<url>https://github.com/holon-platform/holon-json</url>
 		<developerConnection>scm:git:https://github.com/holon-platform/holon-json.git</developerConnection>
-		<tag>HEAD</tag>
+		<tag>5.2.1</tag>
 	</scm>
 
 	<properties>