diff --git a/pom.xml b/pom.xml
index 75efa10..0019fed 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.github.nkzawa</groupId>
   <artifactId>engine.io-client</artifactId>
-  <version>0.2.3</version>
+  <version>0.3.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>engine.io-client</name>
   <description>Engine.IO Client Library for Java</description>