diff --git a/angular/pom.xml b/angular/pom.xml
index 7aad95d..6c6c9ab 100644
--- a/angular/pom.xml
+++ b/angular/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-angular</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Angular interpreter</name>
   <url>http://zeppelin.incubator.apache.org</url>
 
diff --git a/cassandra/pom.xml b/cassandra/pom.xml
index 57b501a..4e17ac9 100644
--- a/cassandra/pom.xml
+++ b/cassandra/pom.xml
@@ -15,21 +15,19 @@
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License.
   -->
-<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>
         <artifactId>zeppelin</artifactId>
         <groupId>org.apache.zeppelin</groupId>
-        <version>0.6.0-incubating-SNAPSHOT</version>
+        <version>0.5.6-incubating</version>
         <relativePath>..</relativePath>
     </parent>
 
     <groupId>org.apache.zeppelin</groupId>
     <artifactId>zeppelin-cassandra</artifactId>
     <packaging>jar</packaging>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <name>Zeppelin: Cassandra</name>
     <description>Zeppelin cassandra support</description>
     <url>http://zeppelin.incubator.apache.org</url>
diff --git a/elasticsearch/pom.xml b/elasticsearch/pom.xml
index 3da4441..a9e1203 100644
--- a/elasticsearch/pom.xml
+++ b/elasticsearch/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-elasticsearch</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Elasticsearch interpreter</name>
   <url>http://www.apache.org</url>
 
diff --git a/flink/pom.xml b/flink/pom.xml
index 3a8c36c..c7e88c4 100644
--- a/flink/pom.xml
+++ b/flink/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-flink</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Flink</name>
   <description>Zeppelin flink support</description>
   <url>http://zeppelin.incubator.apache.org</url>
diff --git a/hive/pom.xml b/hive/pom.xml
index 7dc3cd7..ffbbcf4 100644
--- a/hive/pom.xml
+++ b/hive/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-hive</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Hive interpreter</name>
   <url>http://www.apache.org</url>
 <!--
diff --git a/ignite/pom.xml b/ignite/pom.xml
index c0f47f1..8399e52 100644
--- a/ignite/pom.xml
+++ b/ignite/pom.xml
@@ -22,13 +22,13 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <artifactId>zeppelin-ignite</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Apache Ignite interpreter</name>
   <url>http://zeppelin.incubator.apache.org</url>
 
diff --git a/kylin/pom.xml b/kylin/pom.xml
index 9e5311d..d5a0f8a 100755
--- a/kylin/pom.xml
+++ b/kylin/pom.xml
@@ -17,20 +17,18 @@
   -->
 
 
-<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">
     <parent>
         <artifactId>zeppelin</artifactId>
         <groupId>org.apache.zeppelin</groupId>
-        <version>0.6.0-incubating-SNAPSHOT</version>
+        <version>0.5.6-incubating</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>org.apache.zeppelin</groupId>
     <artifactId>zeppelin-kylin</artifactId>
     <packaging>jar</packaging>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <name>Zeppelin: Kylin interpreter</name>
     <url>http://zeppelin.incubator.apache.org</url>
 
diff --git a/lens/pom.xml b/lens/pom.xml
index bb45ac2..b4f8ac2 100644
--- a/lens/pom.xml
+++ b/lens/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-lens</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Lens interpreter</name>
   <url>http://www.apache.org</url>
   
diff --git a/markdown/pom.xml b/markdown/pom.xml
index 6004f16..8f95162 100644
--- a/markdown/pom.xml
+++ b/markdown/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-markdown</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Markdown interpreter</name>
   <url>http://zeppelin.incubator.apache.org</url>
 
diff --git a/phoenix/pom.xml b/phoenix/pom.xml
index 3cca32d..9fa982f 100644
--- a/phoenix/pom.xml
+++ b/phoenix/pom.xml
@@ -22,13 +22,13 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-phoenix</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Apache Phoenix Interpreter</name>
   <description>Zeppelin interprter for Apache Phoenix</description>
   <url>http://zeppelin.incubator.apache.org</url>
diff --git a/pom.xml b/pom.xml
index 9d5b572..66e4438 100755
--- a/pom.xml
+++ b/pom.xml
@@ -16,8 +16,7 @@
   ~ limitations under the License.
   -->
 
-<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/maven-v4_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/maven-v4_0_0.xsd">
 
   <!-- Licensed to the Apache Software Foundation (ASF) under one or more
     contributor license agreements. See the NOTICE file distributed with this
@@ -35,7 +34,7 @@
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin</artifactId>
   <packaging>pom</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin</name>
   <description>Zeppelin project</description>
   <url>http://zeppelin.incubator.apache.org/</url>
@@ -58,6 +57,7 @@
     <url>https://git-wip-us.apache.org/repos/asf/incubator-zeppelin.git</url>
     <connection>scm:git:https://git-wip-us.apache.org/repos/asf/incubator-zeppelin.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/incubator-zeppelin.git</developerConnection>
+    <tag>v0.5.6</tag>
   </scm>
 
   <developers>
@@ -398,7 +398,7 @@
             <id>enforce</id>
             <configuration>
               <rules>
-                <DependencyConvergence/>
+                <DependencyConvergence />
               </rules>
               <failFast>true</failFast>
             </configuration>
@@ -587,7 +587,7 @@
                     </goals>
                   </pluginExecutionFilter>
                   <action>
-                    <ignore/>
+                    <ignore />
                   </action>
                 </pluginExecution>
                 <pluginExecution>
@@ -607,7 +607,7 @@
                     </goals>
                   </pluginExecutionFilter>
                   <action>
-                    <ignore></ignore>
+                    <ignore />
                   </action>
                 </pluginExecution>
               </pluginExecutions>
diff --git a/postgresql/pom.xml b/postgresql/pom.xml
index daf27af..afe09ba 100644
--- a/postgresql/pom.xml
+++ b/postgresql/pom.xml
@@ -16,20 +16,19 @@
   ~ limitations under the License.
   -->
 
-<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/maven-v4_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/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-postgresql</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: PostgreSQL interpreter</name>
   <url>http://www.apache.org</url>
 
diff --git a/shell/pom.xml b/shell/pom.xml
index 6379bea..49b89ab 100644
--- a/shell/pom.xml
+++ b/shell/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-shell</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Shell interpreter</name>
   <url>http://zeppelin.incubator.apache.org</url>
 
diff --git a/spark-dependencies/pom.xml b/spark-dependencies/pom.xml
index cb8bfc4..770f7e9 100644
--- a/spark-dependencies/pom.xml
+++ b/spark-dependencies/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-spark-dependencies</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Spark dependencies</name>
   <description>Zeppelin spark support</description>
   <url>http://zeppelin.incubator.apache.org</url>
@@ -43,7 +43,7 @@
     <hadoop.version>2.3.0</hadoop.version>
     <yarn.version>${hadoop.version}</yarn.version>
     <avro.version>1.7.7</avro.version>
-    <avro.mapred.classifier></avro.mapred.classifier>
+    <avro.mapred.classifier />
     <jets3t.version>0.7.1</jets3t.version>
     <protobuf.version>2.4.1</protobuf.version>
 
@@ -792,12 +792,9 @@
                 </goals>
                 <configuration>
                   <target>
-                    <delete dir="../interpreter/spark/pyspark"/>
-                    <copy todir="../interpreter/spark/pyspark"
-                        file="${project.build.directory}/spark-dist/spark-${spark.version}/python/lib/py4j-${py4j.version}-src.zip"/>
-                    <zip destfile="${project.build.directory}/../../interpreter/spark/pyspark/pyspark.zip"
-                         basedir="${project.build.directory}/spark-dist/spark-${spark.version}/python"
-                         includes="pyspark/*.py,pyspark/**/*.py"/>
+                    <delete dir="../interpreter/spark/pyspark" />
+                    <copy todir="../interpreter/spark/pyspark" file="${project.build.directory}/spark-dist/spark-${spark.version}/python/lib/py4j-${py4j.version}-src.zip" />
+                    <zip destfile="${project.build.directory}/../../interpreter/spark/pyspark/pyspark.zip" basedir="${project.build.directory}/spark-dist/spark-${spark.version}/python" includes="pyspark/*.py,pyspark/**/*.py" />
                   </target>
                 </configuration>
               </execution>
@@ -878,7 +875,7 @@
             </filter>
           </filters>
           <transformers>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
             <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
               <resource>reference.conf</resource>
             </transformer>
diff --git a/spark/pom.xml b/spark/pom.xml
index 2bc1d6d..bc37fde 100644
--- a/spark/pom.xml
+++ b/spark/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-spark</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Spark</name>
   <description>Zeppelin spark support</description>
   <url>http://zeppelin.incubator.apache.org</url>
@@ -408,7 +408,7 @@
             </filter>
           </filters>
           <transformers>
-            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
             <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
               <resource>reference.conf</resource>
             </transformer>
diff --git a/tajo/pom.xml b/tajo/pom.xml
index cf4311f..10bed77 100644
--- a/tajo/pom.xml
+++ b/tajo/pom.xml
@@ -21,14 +21,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-tajo</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Tajo interpreter</name>
   <url>http://www.apache.org</url>
 
diff --git a/zeppelin-distribution/pom.xml b/zeppelin-distribution/pom.xml
index df44898..b84a72f 100644
--- a/zeppelin-distribution/pom.xml
+++ b/zeppelin-distribution/pom.xml
@@ -16,14 +16,13 @@
   ~ limitations under the License.
   -->
 
-<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>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/zeppelin-interpreter/pom.xml b/zeppelin-interpreter/pom.xml
index 59d2cd0..5ac6793 100644
--- a/zeppelin-interpreter/pom.xml
+++ b/zeppelin-interpreter/pom.xml
@@ -16,22 +16,21 @@
   ~ limitations under the License.
   -->
 
-<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>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-interpreter</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Interpreter</name>
   <description>Zeppelin Interpreter</description>
   <url>http://zeppelin.incubator.apache.org</url>
diff --git a/zeppelin-server/pom.xml b/zeppelin-server/pom.xml
index e77ee6c..8162392 100644
--- a/zeppelin-server/pom.xml
+++ b/zeppelin-server/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-server</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Server</name>
   <url>http://www.nflabs.com</url>
 
@@ -337,7 +337,7 @@
         <artifactId>scalatest-maven-plugin</artifactId>
         <version>1.0</version>
         <configuration>
-          <stderr/>
+          <stderr />
           <systemProperties>
             <spark.testing>1</spark.testing>
           </systemProperties>
diff --git a/zeppelin-web/pom.xml b/zeppelin-web/pom.xml
index 6b278af..124f859 100644
--- a/zeppelin-web/pom.xml
+++ b/zeppelin-web/pom.xml
@@ -22,14 +22,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-web</artifactId>
   <packaging>war</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: web Application</name>
 
   <!-- See https://github.com/eirslett/frontend-maven-plugin/issues/229 -->
diff --git a/zeppelin-zengine/pom.xml b/zeppelin-zengine/pom.xml
index 0ef60bf..3f868f9 100644
--- a/zeppelin-zengine/pom.xml
+++ b/zeppelin-zengine/pom.xml
@@ -23,14 +23,14 @@
   <parent>
     <artifactId>zeppelin</artifactId>
     <groupId>org.apache.zeppelin</groupId>
-    <version>0.6.0-incubating-SNAPSHOT</version>
+    <version>0.5.6-incubating</version>
     <relativePath>..</relativePath>
   </parent>
 
   <groupId>org.apache.zeppelin</groupId>
   <artifactId>zeppelin-zengine</artifactId>
   <packaging>jar</packaging>
-  <version>0.6.0-incubating-SNAPSHOT</version>
+  <version>0.5.6-incubating</version>
   <name>Zeppelin: Zengine</name>
   <description>Zeppelin Zengine</description>
   <url>http://zeppelin.incubator.apache.org</url>