diff --git a/.gitignore b/.gitignore
index e19921af..b36eff49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -81,3 +81,5 @@ atlassian-ide-plugin.xml
 */logs
 
 /payClear-timer/.tern-project
+
+.flattened-pom.xml
\ No newline at end of file
diff --git a/liteflow-core/pom.xml b/liteflow-core/pom.xml
index e50fb722..27e3cd25 100644
--- a/liteflow-core/pom.xml
+++ b/liteflow-core/pom.xml
@@ -9,7 +9,8 @@
     <parent>
 		<groupId>com.yomahub</groupId>
 		<artifactId>liteflow</artifactId>
-		<version>2.8.0</version>
+		<version>${revision}</version>
+		<relativePath>../pom.xml</relativePath>
 	</parent>
 
 	<dependencies>
diff --git a/liteflow-script-common/pom.xml b/liteflow-script-common/pom.xml
index a3035e26..9a66228f 100644
--- a/liteflow-script-common/pom.xml
+++ b/liteflow-script-common/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-script-groovy/pom.xml b/liteflow-script-groovy/pom.xml
index 7c1991f5..9a40ad5f 100644
--- a/liteflow-script-groovy/pom.xml
+++ b/liteflow-script-groovy/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-script-qlexpress/pom.xml b/liteflow-script-qlexpress/pom.xml
index b4480894..a900dc6d 100644
--- a/liteflow-script-qlexpress/pom.xml
+++ b/liteflow-script-qlexpress/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-spring-boot-starter/pom.xml b/liteflow-spring-boot-starter/pom.xml
index 2d2630a5..cb3f53c8 100644
--- a/liteflow-spring-boot-starter/pom.xml
+++ b/liteflow-spring-boot-starter/pom.xml
@@ -10,7 +10,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <dependencies>
diff --git a/liteflow-spring/pom.xml b/liteflow-spring/pom.xml
index d148a69b..ce11184e 100644
--- a/liteflow-spring/pom.xml
+++ b/liteflow-spring/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-el/liteflow-testcase-el-declare-springboot/pom.xml b/liteflow-testcase-el/liteflow-testcase-el-declare-springboot/pom.xml
index e5e7b167..50fb386b 100644
--- a/liteflow-testcase-el/liteflow-testcase-el-declare-springboot/pom.xml
+++ b/liteflow-testcase-el/liteflow-testcase-el-declare-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-el</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-el/liteflow-testcase-el-script-groovy-springboot/pom.xml b/liteflow-testcase-el/liteflow-testcase-el-script-groovy-springboot/pom.xml
index c4c40936..fda750c1 100644
--- a/liteflow-testcase-el/liteflow-testcase-el-script-groovy-springboot/pom.xml
+++ b/liteflow-testcase-el/liteflow-testcase-el-script-groovy-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-el</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-el/liteflow-testcase-el-script-qlexpress-springboot/pom.xml b/liteflow-testcase-el/liteflow-testcase-el-script-qlexpress-springboot/pom.xml
index 11a49381..d976ffb3 100644
--- a/liteflow-testcase-el/liteflow-testcase-el-script-qlexpress-springboot/pom.xml
+++ b/liteflow-testcase-el/liteflow-testcase-el-script-qlexpress-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-el</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-el/liteflow-testcase-el-springboot/pom.xml b/liteflow-testcase-el/liteflow-testcase-el-springboot/pom.xml
index 0fdb1d62..8bec4c78 100644
--- a/liteflow-testcase-el/liteflow-testcase-el-springboot/pom.xml
+++ b/liteflow-testcase-el/liteflow-testcase-el-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-el</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-el/pom.xml b/liteflow-testcase-el/pom.xml
index a5b96290..4a3daca3 100644
--- a/liteflow-testcase-el/pom.xml
+++ b/liteflow-testcase-el/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <packaging>pom</packaging>
diff --git a/liteflow-testcase-old/liteflow-testcase-declare-springboot/pom.xml b/liteflow-testcase-old/liteflow-testcase-declare-springboot/pom.xml
index a7d472a9..d50f6d8b 100644
--- a/liteflow-testcase-old/liteflow-testcase-declare-springboot/pom.xml
+++ b/liteflow-testcase-old/liteflow-testcase-declare-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-old</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-old/liteflow-testcase-nospring/pom.xml b/liteflow-testcase-old/liteflow-testcase-nospring/pom.xml
index a714716a..2d18b653 100644
--- a/liteflow-testcase-old/liteflow-testcase-nospring/pom.xml
+++ b/liteflow-testcase-old/liteflow-testcase-nospring/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-old</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-old/liteflow-testcase-script-groovy-springboot/pom.xml b/liteflow-testcase-old/liteflow-testcase-script-groovy-springboot/pom.xml
index 343f468a..1adce85e 100644
--- a/liteflow-testcase-old/liteflow-testcase-script-groovy-springboot/pom.xml
+++ b/liteflow-testcase-old/liteflow-testcase-script-groovy-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-old</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-old/liteflow-testcase-script-qlexpress-springboot/pom.xml b/liteflow-testcase-old/liteflow-testcase-script-qlexpress-springboot/pom.xml
index 6f52c8b3..8cd9b7e0 100644
--- a/liteflow-testcase-old/liteflow-testcase-script-qlexpress-springboot/pom.xml
+++ b/liteflow-testcase-old/liteflow-testcase-script-qlexpress-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-old</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-old/liteflow-testcase-springboot/pom.xml b/liteflow-testcase-old/liteflow-testcase-springboot/pom.xml
index 8f6f808e..7f2e37c7 100644
--- a/liteflow-testcase-old/liteflow-testcase-springboot/pom.xml
+++ b/liteflow-testcase-old/liteflow-testcase-springboot/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-old</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-old/liteflow-testcase-springnative/pom.xml b/liteflow-testcase-old/liteflow-testcase-springnative/pom.xml
index b81e581e..5c9b5cc2 100644
--- a/liteflow-testcase-old/liteflow-testcase-springnative/pom.xml
+++ b/liteflow-testcase-old/liteflow-testcase-springnative/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow-testcase-old</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/liteflow-testcase-old/pom.xml b/liteflow-testcase-old/pom.xml
index 417f7680..ab208e3b 100644
--- a/liteflow-testcase-old/pom.xml
+++ b/liteflow-testcase-old/pom.xml
@@ -5,7 +5,8 @@
     <parent>
         <artifactId>liteflow</artifactId>
         <groupId>com.yomahub</groupId>
-        <version>2.8.0</version>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <packaging>pom</packaging>
diff --git a/pom.xml b/pom.xml
index 273b9dd6..1e684a54 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 	<groupId>com.yomahub</groupId>
 	<artifactId>liteflow</artifactId>
 	<packaging>pom</packaging>
-	<version>2.8.0</version>
+	<version>${revision}</version>
 	<name>liteflow</name>
 	<description>a lightweight and practical micro-process framework</description>
 	<url>https://github.com/bryan31/liteflow</url>
@@ -39,6 +39,9 @@
 	</scm>
 
 	<properties>
+		<revision>2.8.0</revision>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<maven.compiler.source>8</maven.compiler.source>
 		<maven.compiler.target>8</maven.compiler.target>
 		<springboot.version>2.0.5.RELEASE</springboot.version>
@@ -280,6 +283,32 @@
 					</execution>
 				</executions>
 			</plugin>
+			<!-- version number -->
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>flatten-maven-plugin</artifactId>
+				<version>1.2.7</version>
+				<configuration>
+					<updatePomFile>true</updatePomFile>
+					<flattenMode>resolveCiFriendliesOnly</flattenMode>
+				</configuration>
+				<executions>
+					<execution>
+						<id>flatten</id>
+						<phase>process-resources</phase>
+						<goals>
+							<goal>flatten</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>flatten.clean</id>
+						<phase>clean</phase>
+						<goals>
+							<goal>clean</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
 		</plugins>
 	</build>