diff --git a/distributedlog-benchmark/pom.xml b/distributedlog-benchmark/pom.xml
index 86724bc..560d00c 100644
--- a/distributedlog-benchmark/pom.xml
+++ b/distributedlog-benchmark/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
   </parent>
   <artifactId>distributedlog-benchmark_2.10</artifactId>
   <name>Apache DistributedLog :: Benchmark</name>
diff --git a/distributedlog-build-tools/pom.xml b/distributedlog-build-tools/pom.xml
index fdda039..4eef9a6 100644
--- a/distributedlog-build-tools/pom.xml
+++ b/distributedlog-build-tools/pom.xml
@@ -20,10 +20,10 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>distributedlog-build-tools</artifactId>
   <name>Apache DistributedLog :: Build Tools</name>
-  <version>0.5.0-incubating-SNAPSHOT</version>
+  <version>0.4.0-incubating</version>
 </project>
diff --git a/distributedlog-client/pom.xml b/distributedlog-client/pom.xml
index 4c68446..5cc7d2d 100644
--- a/distributedlog-client/pom.xml
+++ b/distributedlog-client/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
   </parent>
   <artifactId>distributedlog-client_2.10</artifactId>
   <name>Apache DistributedLog :: Proxy Client</name>
diff --git a/distributedlog-core/pom.xml b/distributedlog-core/pom.xml
index c0a7b80..96ff6b1 100644
--- a/distributedlog-core/pom.xml
+++ b/distributedlog-core/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
   </parent>
   <artifactId>distributedlog-core_2.10</artifactId>
   <name>Apache DistributedLog :: Core Library</name>
diff --git a/distributedlog-protocol/pom.xml b/distributedlog-protocol/pom.xml
index 5b82ccc..a073f29 100644
--- a/distributedlog-protocol/pom.xml
+++ b/distributedlog-protocol/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
   </parent>
   <artifactId>distributedlog-protocol_2.10</artifactId>
   <name>Apache DistributedLog :: Protocol</name>
diff --git a/distributedlog-service/pom.xml b/distributedlog-service/pom.xml
index bca85a3..1b81fff 100644
--- a/distributedlog-service/pom.xml
+++ b/distributedlog-service/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
   </parent>
   <artifactId>distributedlog-service_2.10</artifactId>
   <name>Apache DistributedLog :: Proxy Service</name>
diff --git a/distributedlog-tutorials/distributedlog-basic/pom.xml b/distributedlog-tutorials/distributedlog-basic/pom.xml
index 5c00bd7..a97e482 100644
--- a/distributedlog-tutorials/distributedlog-basic/pom.xml
+++ b/distributedlog-tutorials/distributedlog-basic/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>distributedlog_2.10</artifactId>
     <groupId>org.apache.distributedlog</groupId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
     <relativePath>../..</relativePath>
   </parent>
   <groupId>org.apache.distributedlog</groupId>
diff --git a/distributedlog-tutorials/distributedlog-kafka/pom.xml b/distributedlog-tutorials/distributedlog-kafka/pom.xml
index 1aae223..e3c09ed 100644
--- a/distributedlog-tutorials/distributedlog-kafka/pom.xml
+++ b/distributedlog-tutorials/distributedlog-kafka/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>distributedlog_2.10</artifactId>
     <groupId>org.apache.distributedlog</groupId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
     <relativePath>../..</relativePath>
   </parent>
   <groupId>org.apache.distributedlog</groupId>
diff --git a/distributedlog-tutorials/distributedlog-mapreduce/pom.xml b/distributedlog-tutorials/distributedlog-mapreduce/pom.xml
index ed30054..9351fed 100644
--- a/distributedlog-tutorials/distributedlog-mapreduce/pom.xml
+++ b/distributedlog-tutorials/distributedlog-mapreduce/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>distributedlog_2.10</artifactId>
     <groupId>org.apache.distributedlog</groupId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
     <relativePath>../..</relativePath>
   </parent>
   <groupId>org.apache.distributedlog</groupId>
diff --git a/distributedlog-tutorials/distributedlog-messaging/pom.xml b/distributedlog-tutorials/distributedlog-messaging/pom.xml
index 9f3089d..40c2c7e 100644
--- a/distributedlog-tutorials/distributedlog-messaging/pom.xml
+++ b/distributedlog-tutorials/distributedlog-messaging/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>distributedlog_2.10</artifactId>
     <groupId>org.apache.distributedlog</groupId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
     <relativePath>../..</relativePath>
   </parent>
   <groupId>org.apache.distributedlog</groupId>
diff --git a/distributedlog-tutorials/pom.xml b/distributedlog-tutorials/pom.xml
index abee2c8..926641e 100644
--- a/distributedlog-tutorials/pom.xml
+++ b/distributedlog-tutorials/pom.xml
@@ -19,7 +19,7 @@
   <parent>
     <groupId>org.apache.distributedlog</groupId>
     <artifactId>distributedlog_2.10</artifactId>
-    <version>0.5.0-incubating-SNAPSHOT</version>
+    <version>0.4.0-incubating</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>distributedlog-tutorials_2.10</artifactId>
diff --git a/pom.xml b/pom.xml
index 53987f7..1d875e5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
   <groupId>org.apache.distributedlog</groupId>
   <artifactId>distributedlog_2.10</artifactId>
   <packaging>pom</packaging>
-  <version>0.5.0-incubating-SNAPSHOT</version>
+  <version>0.4.0-incubating</version>
   <name>Apache DistributedLog :: Parent</name>
   <description>
     Apache DistributedLog provides a high performance replicated log service.
@@ -43,7 +43,7 @@
     <connection>scm:git:https://git-wip-us.apache.org/repos/asf/incubator-distributedlog.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/incubator-distributedlog.git</developerConnection>
     <url>https://git-wip-us.apache.org/repos/asf?p=incubator-distributedlog.git;a=summary</url>
-    <tag>release-0.4.0-incubating</tag>
+    <tag>v0.4.0-incubating-RC4_2.10</tag>
   </scm>
   <issueManagement>
     <system>jira</system>