diff --git a/pom.xml b/pom.xml
index e3bd30e..5b47984 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
         <version>7</version>
     </parent>
     <groupId>us.codecraft</groupId>
-    <version>0.2.2-SNAPSHOT</version>
+    <version>0.3.0-SNAPSHOT</version>
     <modelVersion>4.0.0</modelVersion>
     <packaging>pom</packaging>
     <properties>
diff --git a/webmagic-core/pom.xml b/webmagic-core/pom.xml
index ef9f84a..9e3d4a2 100644
--- a/webmagic-core/pom.xml
+++ b/webmagic-core/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>us.codecraft</groupId>
         <artifactId>webmagic-parent</artifactId>
-        <version>0.2.2-SNAPSHOT</version>
+        <version>0.3.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/selector/BaseElementSelector.java b/webmagic-core/src/main/java/us/codecraft/webmagic/selector/BaseElementSelector.java
index d14a708..e313f24 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/selector/BaseElementSelector.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/selector/BaseElementSelector.java
@@ -6,7 +6,7 @@ import java.util.List;
 
 /**
  * @author code4crafter@gmail.com
- * @since 0.2.2
+ * @since 0.3.0
  */
 public abstract class BaseElementSelector implements Selector,ElementSelector {
 
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/selector/ElementSelector.java b/webmagic-core/src/main/java/us/codecraft/webmagic/selector/ElementSelector.java
index 793b825..e422ac8 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/selector/ElementSelector.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/selector/ElementSelector.java
@@ -8,7 +8,7 @@ import java.util.List;
  * Selector(extractor) for html elements.<br>
  *
  * @author code4crafter@gmail.com <br>
- * @since 0.2.2
+ * @since 0.3.0
  */
 public interface ElementSelector {
 
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/selector/XsoupSelector.java b/webmagic-core/src/main/java/us/codecraft/webmagic/selector/XsoupSelector.java
index 698b29b..ea46290 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/selector/XsoupSelector.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/selector/XsoupSelector.java
@@ -10,7 +10,7 @@ import java.util.List;
  * XPath selector based on Xsoup.<br>
  *
  * @author code4crafter@gmail.com <br>
- * @since 0.2.2
+ * @since 0.3.0
  */
 public class XsoupSelector extends BaseElementSelector {
 
diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/utils/EnvironmentUtil.java b/webmagic-core/src/main/java/us/codecraft/webmagic/utils/EnvironmentUtil.java
index 1d63aec..7aa5c13 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/utils/EnvironmentUtil.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/utils/EnvironmentUtil.java
@@ -6,7 +6,7 @@ import java.util.Properties;
 
 /**
  * @author code4crafter@gmail.com
- * @since 0.2.2
+ * @since 0.3.0
  */
 public abstract class EnvironmentUtil {
 
diff --git a/webmagic-extension/pom.xml b/webmagic-extension/pom.xml
index 1914b71..4cad2b0 100644
--- a/webmagic-extension/pom.xml
+++ b/webmagic-extension/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>us.codecraft</groupId>
         <artifactId>webmagic-parent</artifactId>
-        <version>0.2.2-SNAPSHOT</version>
+        <version>0.3.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/webmagic-extension/src/main/java/us/codecraft/webmagic/pipeline/FilePageModelPipeline.java b/webmagic-extension/src/main/java/us/codecraft/webmagic/pipeline/FilePageModelPipeline.java
index d3ed1f0..5586863 100644
--- a/webmagic-extension/src/main/java/us/codecraft/webmagic/pipeline/FilePageModelPipeline.java
+++ b/webmagic-extension/src/main/java/us/codecraft/webmagic/pipeline/FilePageModelPipeline.java
@@ -18,7 +18,7 @@ import java.io.PrintWriter;
  * Otherwise use SHA1 as file name.
  *
  * @author code4crafter@gmail.com <br>
- * @since 0.2.2
+ * @since 0.3.0
  */
 public class FilePageModelPipeline extends FilePersistentBase implements PageModelPipeline {
 
diff --git a/webmagic-samples/pom.xml b/webmagic-samples/pom.xml
index a349a68..a620ae5 100644
--- a/webmagic-samples/pom.xml
+++ b/webmagic-samples/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>webmagic-parent</artifactId>
         <groupId>us.codecraft</groupId>
-        <version>0.2.2-SNAPSHOT</version>
+        <version>0.3.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>