diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f591a3a..5544970 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,6 +14,8 @@ jobs:
     strategy:
       matrix:
         go:
+        - '1.22'
+        - '1.21'
         - '1.20'
         - '1.19'
         - '1.18'
diff --git a/examples/area_line_chart/main.go b/examples/area_line_chart/main.go
index 7a84df0..ea8f1c2 100644
--- a/examples/area_line_chart/main.go
+++ b/examples/area_line_chart/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "area-line-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/bar_chart/main.go b/examples/bar_chart/main.go
index c559a76..feea66e 100644
--- a/examples/bar_chart/main.go
+++ b/examples/bar_chart/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "bar-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/chinese/main.go b/examples/chinese/main.go
index d77216a..2d96b58 100644
--- a/examples/chinese/main.go
+++ b/examples/chinese/main.go
@@ -16,7 +16,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "chinese-line-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/funnel_chart/main.go b/examples/funnel_chart/main.go
index 24f8afe..f29ccf9 100644
--- a/examples/funnel_chart/main.go
+++ b/examples/funnel_chart/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "funnel-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/horizontal_bar_chart/main.go b/examples/horizontal_bar_chart/main.go
index a1c50a7..f2cabe8 100644
--- a/examples/horizontal_bar_chart/main.go
+++ b/examples/horizontal_bar_chart/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "horizontal-bar-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/line_chart/main.go b/examples/line_chart/main.go
index c1478a6..4e6448f 100644
--- a/examples/line_chart/main.go
+++ b/examples/line_chart/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -17,7 +16,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "line-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
@@ -97,6 +96,11 @@ func main() {
 				Top:    5,
 				Bottom: 10,
 			}
+			opt.YAxisOptions = []charts.YAxisOption{
+				{
+					SplitLineShow: charts.FalseFlag(),
+				},
+			}
 			opt.SymbolShow = charts.FalseFlag()
 			opt.LineStrokeWidth = 1
 			opt.ValueFormatter = func(f float64) string {
diff --git a/examples/painter/main.go b/examples/painter/main.go
index 3c31ce4..b7a5832 100644
--- a/examples/painter/main.go
+++ b/examples/painter/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -17,7 +16,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "painter.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/pie_chart/main.go b/examples/pie_chart/main.go
index 3721ed1..38488d2 100644
--- a/examples/pie_chart/main.go
+++ b/examples/pie_chart/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "pie-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/radar_chart/main.go b/examples/radar_chart/main.go
index 51f7409..e8095ae 100644
--- a/examples/radar_chart/main.go
+++ b/examples/radar_chart/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "radar-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/table/main.go b/examples/table/main.go
index 2701ec1..0210ecf 100644
--- a/examples/table/main.go
+++ b/examples/table/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -19,7 +18,7 @@ func writeFile(buf []byte, filename string) error {
 	}
 
 	file := filepath.Join(tmpPath, filename)
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/examples/time_line_chart/main.go b/examples/time_line_chart/main.go
index 10932cd..6cb3f3d 100644
--- a/examples/time_line_chart/main.go
+++ b/examples/time_line_chart/main.go
@@ -3,7 +3,6 @@ package main
 import (
 	"crypto/rand"
 	"fmt"
-	"io/ioutil"
 	"math/big"
 	"os"
 	"path/filepath"
@@ -20,7 +19,7 @@ func writeFile(buf []byte) error {
 	}
 
 	file := filepath.Join(tmpPath, "time-line-chart.png")
-	err = ioutil.WriteFile(file, buf, 0600)
+	err = os.WriteFile(file, buf, 0600)
 	if err != nil {
 		return err
 	}
diff --git a/yaxis.go b/yaxis.go
index bece2cc..e58b7a6 100644
--- a/yaxis.go
+++ b/yaxis.go
@@ -50,6 +50,8 @@ type YAxisOption struct {
 	DivideCount    int
 	Unit           int
 	isCategoryAxis bool
+	// The flag for show axis split line, set this to true will show axis split line
+	SplitLineShow *bool
 }
 
 // NewYAxisOptions returns a y axis option
@@ -100,6 +102,9 @@ func (opt *YAxisOption) ToAxisOption(p *Painter) AxisOption {
 		axisOpt.StrokeWidth = 1
 		axisOpt.SplitLineShow = false
 	}
+	if opt.SplitLineShow != nil {
+		axisOpt.SplitLineShow = *opt.SplitLineShow
+	}
 	return axisOpt
 }