diff --git a/examples/d1-blog-server/app/handler.go b/examples/d1-blog-server/app/handler.go
index 8675314..1b5f437 100644
--- a/examples/d1-blog-server/app/handler.go
+++ b/examples/d1-blog-server/app/handler.go
@@ -8,11 +8,12 @@ import (
 	"os"
 	"time"
 
+	"github.com/google/uuid"
+
 	"github.com/mailru/easyjson"
 	"github.com/syumai/workers/cloudflare/d1"
 	_ "github.com/syumai/workers/cloudflare/d1" // register driver
 	"github.com/syumai/workers/examples/d1-blog-server/app/model"
-	"github.com/syumai/workers/internal/jsutil"
 )
 
 type articleHandler struct{}
@@ -62,7 +63,7 @@ func (h *articleHandler) createArticle(w http.ResponseWriter, req *http.Request,
 
 	now := time.Now().Unix()
 	article := model.Article{
-		ID:        jsutil.NewUUID(),
+		ID:        uuid.New().String(),
 		Title:     createArticleReq.Title,
 		Body:      createArticleReq.Body,
 		CreatedAt: uint64(now),
diff --git a/examples/d1-blog-server/go.mod b/examples/d1-blog-server/go.mod
index 92d0eed..d3c34c8 100644
--- a/examples/d1-blog-server/go.mod
+++ b/examples/d1-blog-server/go.mod
@@ -9,4 +9,7 @@ require (
 
 replace github.com/syumai/workers => ../../
 
-require github.com/josharian/intern v1.0.0 // indirect
+require (
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+)
diff --git a/examples/d1-blog-server/go.sum b/examples/d1-blog-server/go.sum
index 7707cb6..3e8aec9 100644
--- a/examples/d1-blog-server/go.sum
+++ b/examples/d1-blog-server/go.sum
@@ -1,3 +1,5 @@
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
diff --git a/internal/jsutil/jsutil.go b/internal/jsutil/jsutil.go
index d123727..ac21397 100644
--- a/internal/jsutil/jsutil.go
+++ b/internal/jsutil/jsutil.go
@@ -18,7 +18,6 @@ var (
 	ErrorClass          = Global.Get("Error")
 	ReadableStreamClass = Global.Get("ReadableStream")
 	DateClass           = Global.Get("Date")
-	Crypto              = Global.Get("crypto")
 )
 
 func NewObject() js.Value {
@@ -103,7 +102,3 @@ func DateToTime(v js.Value) (time.Time, error) {
 func TimeToDate(t time.Time) js.Value {
 	return DateClass.New(t.UnixMilli())
 }
-
-func NewUUID() string {
-	return Crypto.Call("randomUUID").String()
-}