diff --git a/examples/read-from-gzip-file/main.go b/examples/read-from-gzip-file/main.go
index db7e282..d22022d 100644
--- a/examples/read-from-gzip-file/main.go
+++ b/examples/read-from-gzip-file/main.go
@@ -28,8 +28,6 @@ func main() {
 		gojob.WithNumWorkers(8),
 		gojob.WithMaxRetries(4),
 		gojob.WithMaxRuntimePerTaskSeconds(16),
-		gojob.WithNumShards(4),
-		gojob.WithShard(0),
 		gojob.WithResultFilePath("-"),
 		gojob.WithStatusFilePath("status.json"),
 	).
diff --git a/examples/write-to-gzip-file/main.go b/examples/write-to-gzip-file/main.go
new file mode 100644
index 0000000..ecf0435
--- /dev/null
+++ b/examples/write-to-gzip-file/main.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+
+	"github.com/WangYihang/gojob"
+)
+
+type MyTask struct {
+	Line string
+}
+
+func New(line string) *MyTask {
+	return &MyTask{
+		Line: line,
+	}
+}
+
+func (t *MyTask) Do() error {
+	time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
+	fmt.Println(t.Line)
+	return nil
+}
+
+func main() {
+	scheduler := gojob.New(
+		gojob.WithNumWorkers(1),
+		gojob.WithMaxRetries(4),
+		gojob.WithMaxRuntimePerTaskSeconds(16),
+		gojob.WithResultFilePath("result.txt.gz"),
+		gojob.WithStatusFilePath("status.json"),
+		gojob.WithMetadataFilePath("status.json"),
+	).
+		Start()
+	for line := range 16 {
+		scheduler.Submit(New(fmt.Sprintf("line-%d", line)))
+	}
+	scheduler.Wait()
+}
diff --git a/go.mod b/go.mod
index 579d536..c787eed 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/WangYihang/gojob
 go 1.22.6
 
 require (
-	github.com/WangYihang/uio v0.0.0-20240829150037-ce8fff04fa48
+	github.com/WangYihang/uio v0.0.0-20240905152743-19ba2df5e6a6
 	github.com/google/uuid v1.6.0
 	github.com/jessevdk/go-flags v1.5.0
 	github.com/prometheus/client_golang v1.19.0
diff --git a/go.sum b/go.sum
index 98f85db..0b6f4a9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/WangYihang/uio v0.0.0-20240829150037-ce8fff04fa48 h1:PUBSQ5ANsRjj6g0jYPKVIo5m50iTS6gxY6TfCl29Rhk=
-github.com/WangYihang/uio v0.0.0-20240829150037-ce8fff04fa48/go.mod h1:T4KtUOTAaSgFJNlU8mEMi5tPSUM1P8Fe1SrjMUwbxZ4=
+github.com/WangYihang/uio v0.0.0-20240905152743-19ba2df5e6a6 h1:4r+fK+dAO7ry5gtFV6emxvcwP9sE8QT8UnPfGqlaD6g=
+github.com/WangYihang/uio v0.0.0-20240905152743-19ba2df5e6a6/go.mod h1:5WoqViIAdldkfhEyOaceDjpfH4wazQDLz86aJVnHnGQ=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/caarlos0/env v3.5.0+incompatible h1:Yy0UN8o9Wtr/jGHZDpCBLpNrzcFLLM2yixi/rBrKyJs=