diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index dbc22b69..3dbf5326 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -46,11 +46,11 @@
 		},
 		{
 			"ImportPath": "github.com/denverdino/aliyungo/oss",
-			"Rev": "cab34948f93584226cdaac45adb09f3bb3725875"
+			"Rev": "641bb4f0ddb552750324cb54c0140ca08865abd0"
 		},
 		{
 			"ImportPath": "github.com/denverdino/aliyungo/util",
-			"Rev": "cab34948f93584226cdaac45adb09f3bb3725875"
+			"Rev": "641bb4f0ddb552750324cb54c0140ca08865abd0"
 		},
 		{
 			"ImportPath": "github.com/docker/docker/pkg/tarsum",
diff --git a/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util.go b/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util.go
index 3e21abfc..daa6bb02 100644
--- a/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util.go
+++ b/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util.go
@@ -10,12 +10,6 @@ import (
 	"sort"
 	"strconv"
 	"time"
-	"errors"
-)
-
-
-const (
-	StatusUnKnown     = "NA"
 )
 
 //CreateRandomString create random string
@@ -138,24 +132,3 @@ func GenerateRandomECSPassword() string {
 	return string(s)
 
 }
-
-
-func LoopCall(attempts AttemptStrategy,api func() (bool,interface{},error))(interface{}, error){
-
-	for attempt := attempts.Start(); attempt.Next(); {
-		needStop,status,err := api()
-
-		if(err != nil) {
-			return nil, errors.New("execution failed")
-		}
-		if(needStop){
-			return status,nil;
-		}
-
-		if attempt.HasNext() {
-			continue;
-		}
-		return nil,errors.New("timeout execution ")
-	}
-	panic("unreachable")
-}
diff --git a/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util_test.go b/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util_test.go
index 354b95f1..87d2a0b8 100644
--- a/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util_test.go
+++ b/Godeps/_workspace/src/github.com/denverdino/aliyungo/util/util_test.go
@@ -2,8 +2,6 @@ package util
 
 import (
 	"testing"
-	"errors"
-	"time"
 )
 
 func TestGenerateRandomECSPassword(t *testing.T) {
@@ -43,56 +41,3 @@ func TestGenerateRandomECSPassword(t *testing.T) {
 		}
 	}
 }
-
-func TestWaitForSignalWithTimeout(t *testing.T) {
-
-	attempts := AttemptStrategy{
-		Min:   5,
-		Total: 5 * time.Second,
-		Delay: 200 * time.Millisecond,
-	}
-
-	timeoutFunc := func() (bool,interface{},error) {
-		return false,"-1",nil
-	}
-
-	begin := time.Now()
-
-	_, timeoutError := LoopCall(attempts, timeoutFunc);
-	if(timeoutError != nil) {
-		t.Logf("timeout func complete successful")
-	} else {
-		t.Error("Expect timeout result")
-	}
-
-	end := time.Now()
-	duration := end.Sub(begin).Seconds()
-	if( duration  > (float64(attempts.Min) -1)) {
-		t.Logf("timeout func duration is enough")
-	} else {
-		t.Error("timeout func duration is not enough")
-	}
-
-	errorFunc := func() (bool, interface{}, error) {
-		err := errors.New("execution failed");
-		return false,"-1",err
-	}
-
-	_, failedError := LoopCall(attempts, errorFunc);
-	if(failedError != nil) {
-		t.Logf("error func complete successful: " + failedError.Error())
-	} else {
-		t.Error("Expect error result")
-	}
-
-	successFunc := func() (bool,interface{}, error) {
-		return true,nil,nil
-	}
-
-	_, successError := LoopCall(attempts, successFunc);
-	if(successError != nil) {
-		t.Error("Expect success result")
-	} else {
-		t.Logf("success func complete successful")
-	}
-}