diff --git a/pom.xml b/pom.xml
index f83d0ac..04e0377 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
 
   <groupId>org.apache.vxquery</groupId>
   <artifactId>apache-vxquery</artifactId>
-  <version>0.4</version>
+  <version>0.5-SNAPSHOT</version>
   <packaging>pom</packaging>
   <name>VXQuery</name>
   <description>A Versatile XQuery Processor</description>
@@ -50,7 +50,7 @@
     <connection>scm:git:https://git-wip-us.apache.org/repos/asf/vxquery.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/vxquery.git</developerConnection>
     <url>https://git-wip-us.apache.org/repos/asf/vxquery.git</url>
-    <tag>apache-vxquery-0.4</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <issueManagement>
diff --git a/vxquery-benchmark/pom.xml b/vxquery-benchmark/pom.xml
index f4a09f7..3be42b2 100644
--- a/vxquery-benchmark/pom.xml
+++ b/vxquery-benchmark/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.vxquery</groupId>
     <artifactId>apache-vxquery</artifactId>
-    <version>0.4</version>
+    <version>0.5-SNAPSHOT</version>
   </parent>
   
   <artifactId>apache-vxquery-benchmark</artifactId>
diff --git a/vxquery-cli/pom.xml b/vxquery-cli/pom.xml
index 3adebcc..ab94c18 100644
--- a/vxquery-cli/pom.xml
+++ b/vxquery-cli/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.vxquery</groupId>
     <artifactId>apache-vxquery</artifactId>
-    <version>0.4</version>
+    <version>0.5-SNAPSHOT</version>
   </parent>
 
   <artifactId>apache-vxquery-cli</artifactId>
@@ -83,7 +83,7 @@
     <dependency>
       <groupId>org.apache.vxquery</groupId>
       <artifactId>apache-vxquery-core</artifactId>
-      <version>0.4</version>
+      <version>0.5-SNAPSHOT</version>
       <scope>compile</scope>
     </dependency>
 
diff --git a/vxquery-core/pom.xml b/vxquery-core/pom.xml
index 7af0e67..1fbe912 100644
--- a/vxquery-core/pom.xml
+++ b/vxquery-core/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.vxquery</groupId>
     <artifactId>apache-vxquery</artifactId>
-    <version>0.4</version>
+    <version>0.5-SNAPSHOT</version>
   </parent>
 
   <artifactId>apache-vxquery-core</artifactId>
diff --git a/vxquery-server/pom.xml b/vxquery-server/pom.xml
index ae779b3..ef8f348 100644
--- a/vxquery-server/pom.xml
+++ b/vxquery-server/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.vxquery</groupId>
     <artifactId>apache-vxquery</artifactId>
-    <version>0.4</version>
+    <version>0.5-SNAPSHOT</version>
   </parent>
 
   <artifactId>apache-vxquery-server</artifactId>
@@ -124,7 +124,7 @@
     <dependency>
       <groupId>org.apache.vxquery</groupId>
       <artifactId>apache-vxquery-core</artifactId>
-      <version>0.4</version>
+      <version>0.5-SNAPSHOT</version>
     </dependency>
 
     <dependency>
diff --git a/vxquery-xtest/pom.xml b/vxquery-xtest/pom.xml
index b0c51e5..dd7b191 100644
--- a/vxquery-xtest/pom.xml
+++ b/vxquery-xtest/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.vxquery</groupId>
     <artifactId>apache-vxquery</artifactId>
-    <version>0.4</version>
+    <version>0.5-SNAPSHOT</version>
   </parent>
 
   <artifactId>apache-vxquery-xtest</artifactId>
@@ -116,7 +116,7 @@
     <dependency>
       <groupId>org.apache.vxquery</groupId>
       <artifactId>apache-vxquery-core</artifactId>
-      <version>0.4</version>
+      <version>0.5-SNAPSHOT</version>
     </dependency>
 
     <dependency>