diff --git a/Makefile b/Makefile
index ecfb6e4..a4991e8 100644
--- a/Makefile
+++ b/Makefile
@@ -5,10 +5,11 @@ pairs := darwin/amd64 linux/amd64 linux/arm64
 GOPATH ?= ~/go
 export GO111MODULE=on
 VERSION ?= v0.0.8
+K6_VERSION ?= v0.33.0
 
 build: 
 	go install github.com/k6io/xk6/cmd/xk6@v0.4.1
-	$(GOPATH)/bin/xk6 build --with github.com/vesoft-inc/k6-plugin@$(VERSION); 
+	$(GOPATH)/bin/xk6 build $(K6_VERSION) --with github.com/vesoft-inc/k6-plugin@$(VERSION); 
 
 build-all: build-arm-v7
 
@@ -16,18 +17,18 @@ build-all: build-arm-v7
 	for  pair in $(pairs);do echo $$pair; \
 			os=`echo $$pair | cut -d / -f 1 ` ;\
 			arch=`echo $$pair | cut -d / -f 2 ` ;\
-			GOOS=$$os GOARCH=$$arch  $(GOPATH)/bin/xk6 build --with github.com/vesoft-inc/k6-plugin@$(VERSION) ;\
+			GOOS=$$os GOARCH=$$arch $(GOPATH)/bin/xk6 build $(K6_VERSION) --with github.com/vesoft-inc/k6-plugin@$(VERSION) ;\
 			mv k6 k6-$$os-$$arch; \
 	done
 
 build-arm-v7:
 	go install github.com/k6io/xk6/cmd/xk6@v0.4.1
-	GOOS=linux GOARCH=arm64 GOARM=7  $(GOPATH)/bin/xk6 build --with github.com/vesoft-inc/k6-plugin@$(VERSION);	
+	GOOS=linux GOARCH=arm64 GOARM=7 $(GOPATH)/bin/xk6 build $(K6_VERSION) --with github.com/vesoft-inc/k6-plugin@$(VERSION);	
 	mv k6 k6-linux-arm64-v7
 
 build-dev:
 	go install github.com/k6io/xk6/cmd/xk6@v0.4.1
-	$(GOPATH)/bin/xk6 build --with github.com/vesoft-inc/k6-plugin@latest=${PWD}/../k6-plugin; 	
+	$(GOPATH)/bin/xk6 build $(K6_VERSION) --with github.com/vesoft-inc/k6-plugin@latest=${PWD}/../k6-plugin; 	
 
 .PHONY: format
 format:
diff --git a/client.go b/client.go
index 7fcaf58..dea304a 100644
--- a/client.go
+++ b/client.go
@@ -19,7 +19,6 @@ type (
 		Log               nebula.Logger
 		DataChs           []chan Data
 		OutoptCh          chan []string
-		Version           string
 		csvStrategy       csvReaderStrategy
 		initialized       bool
 		sessions          []*nebula.Session
@@ -97,7 +96,6 @@ func New() *NebulaPool {
 	return &NebulaPool{
 		Log:         nebula.DefaultLogger{},
 		initialized: false,
-		Version:     version,
 	}
 }
 
diff --git a/register.go b/register.go
index 6b6cafc..486464d 100644
--- a/register.go
+++ b/register.go
@@ -4,8 +4,6 @@ import (
 	"go.k6.io/k6/js/modules"
 )
 
-const version = "v0.0.6"
-
 func init() {
 	modules.Register("k6/x/nebulagraph", New())
 }