diff --git a/c++/pom.xml b/c++/pom.xml
index e4f23c8..358db37 100644
--- a/c++/pom.xml
+++ b/c++/pom.xml
@@ -20,13 +20,13 @@
     <parent>
       <groupId>org.apache.hama</groupId>
       <artifactId>hama-parent</artifactId>
-      <version>0.7.1</version>
+      <version>0.7.1-SNAPSHOT</version>
     </parent>
     
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-pipes</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
     <name>pipes</name>
     <description>Apache Hama Pipes</description>
     <packaging>pom</packaging>
diff --git a/commons/pom.xml b/commons/pom.xml
index a7bb98c..8625c2f 100644
--- a/commons/pom.xml
+++ b/commons/pom.xml
@@ -20,14 +20,14 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-commons</artifactId>
   <name>commons</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <dependencies>
diff --git a/core/pom.xml b/core/pom.xml
index 05e81b2..2adb920 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -20,14 +20,14 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-core</artifactId>
   <name>core</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <dependencies>
diff --git a/dist/pom.xml b/dist/pom.xml
index 7cb7e17..f8cae37 100644
--- a/dist/pom.xml
+++ b/dist/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
   
   <artifactId>hama-dist</artifactId>
diff --git a/examples/pom.xml b/examples/pom.xml
index ec77362..49b7227 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -20,14 +20,14 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-examples</artifactId>
   <name>examples</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <dependencies>
diff --git a/graph/pom.xml b/graph/pom.xml
index 982ea07..14fd3ef 100644
--- a/graph/pom.xml
+++ b/graph/pom.xml
@@ -20,14 +20,14 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-graph</artifactId>
   <name>graph</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <dependencies>
diff --git a/mesos/pom.xml b/mesos/pom.xml
index fbff0ec..c0af443 100644
--- a/mesos/pom.xml
+++ b/mesos/pom.xml
@@ -19,7 +19,7 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
diff --git a/ml/pom.xml b/ml/pom.xml
index 5d81f1d..6701df0 100644
--- a/ml/pom.xml
+++ b/ml/pom.xml
@@ -20,14 +20,14 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-ml</artifactId>
   <name>machine learning</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <dependencies>
diff --git a/pom.xml b/pom.xml
index 9088df5..b7c575c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,7 +27,7 @@
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-parent</artifactId>
   <name>Apache Hama parent POM</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <url>http://hama.apache.org</url>
   <packaging>pom</packaging>
   <prerequisites>
@@ -79,7 +79,7 @@
     <url>https://git-wip-us.apache.org/repos/asf/hama.git</url>
     <connection>scm:git:https://git-wip-us.apache.org/repos/asf/hama.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/hama.git</developerConnection>
-    <tag>0.7.1-RC2</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <properties>
diff --git a/yarn/pom.xml b/yarn/pom.xml
index f73b75f..dede15f 100644
--- a/yarn/pom.xml
+++ b/yarn/pom.xml
@@ -19,14 +19,14 @@
   <parent>
     <groupId>org.apache.hama</groupId>
     <artifactId>hama-parent</artifactId>
-    <version>0.7.1</version>
+    <version>0.7.1-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.hama</groupId>
   <artifactId>hama-yarn</artifactId>
   <name>yarn</name>
-  <version>0.7.1</version>
+  <version>0.7.1-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <dependencies>