diff --git a/pom.xml b/pom.xml
index abb468f..f08ac89 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,7 +57,7 @@
     <dependency>
       <groupId>com.github.nkzawa</groupId>
       <artifactId>engine.io-client</artifactId>
-      <version>0.1.0-SNAPSHOT</version>
+      <version>0.1.1-snapshot</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>
diff --git a/src/main/java/com/github/nkzawa/socketio/client/Engine.java b/src/main/java/com/github/nkzawa/socketio/client/Engine.java
index c44512b..f20dc3b 100644
--- a/src/main/java/com/github/nkzawa/socketio/client/Engine.java
+++ b/src/main/java/com/github/nkzawa/socketio/client/Engine.java
@@ -16,4 +16,7 @@ class Engine extends com.github.nkzawa.engineio.client.Socket {
 
     @Override
     public void onclose() {}
+
+    @Override
+    public void onerror(Exception err) {}
 }