diff --git a/pom.xml b/pom.xml
index 5907769..77906c6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.github.nkzawa</groupId>
   <artifactId>socket.io-client</artifactId>
-  <version>0.1.1-SNAPSHOT</version>
+  <version>0.1.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>socket.io-client</name>
   <description>Socket.IO Client Library for Java</description>
@@ -57,7 +57,7 @@
     <dependency>
       <groupId>com.github.nkzawa</groupId>
       <artifactId>engine.io-client</artifactId>
-      <version>0.2.0-SNAPSHOT</version>
+      <version>0.2.0</version>
     </dependency>
     <dependency>
       <groupId>org.json</groupId>
diff --git a/src/main/java/com/github/nkzawa/socketio/client/Manager.java b/src/main/java/com/github/nkzawa/socketio/client/Manager.java
index 3ed79a7..dc629f9 100644
--- a/src/main/java/com/github/nkzawa/socketio/client/Manager.java
+++ b/src/main/java/com/github/nkzawa/socketio/client/Manager.java
@@ -480,17 +480,5 @@ public class Manager extends Emitter {
         Engine(URI uri, Options opts) {
             super(uri, opts);
         }
-
-        @Override
-        public void onopen() {}
-
-        @Override
-        public void onmessage(String s) {}
-
-        @Override
-        public void onclose() {}
-
-        @Override
-        public void onerror(Exception err) {}
     }
 }
diff --git a/src/test/resources/package.json b/src/test/resources/package.json
index b58e59a..7d34836 100644
--- a/src/test/resources/package.json
+++ b/src/test/resources/package.json
@@ -3,7 +3,6 @@
   "version": "0.0.0",
   "private": true,
   "dependencies": {
-    "socket.io": "LearnBoost/socket.io",
-    "engine.io-parser": "nkzawa/engine.io-parser#patch-0"
+    "socket.io": "1.0.0-pre2"
   }
 }