diff --git a/cmd/promlinter/main.go b/cmd/promlinter/main.go
index 271a0f8..a12f426 100644
--- a/cmd/promlinter/main.go
+++ b/cmd/promlinter/main.go
@@ -13,7 +13,7 @@ import (
 	"text/tabwriter"
 
 	"gopkg.in/alecthomas/kingpin.v2"
-	"gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v3"
 
 	"github.com/yeya24/promlinter"
 )
@@ -196,7 +196,7 @@ func (p *printer) printDefault() {
 
 		help := "N/A"
 		if m.MetricFamily.Help != nil {
-			help = *m.MetricFamily.Help
+			help = m.MetricFamily.GetHelp()
 		}
 
 		labels := strings.Join(m.Labels(), ",")
@@ -206,16 +206,16 @@ func (p *printer) printDefault() {
 
 		var lineArr []string
 
-		mname := *m.MetricFamily.Name
+		mname := m.MetricFamily.GetName()
 		if p.fmt == "md" {
-			mname = fmt.Sprintf("`%s`", *m.MetricFamily.Name)
+			mname = fmt.Sprintf("`%s`", m.MetricFamily.GetName())
 			labels = fmt.Sprintf("`%s`", labels)
 		}
 
 		if (p.addPosition || p.addModule) && p.addHelp {
 			lineArr = []string{
 				p.pos(m.Pos.String()),
-				MetricType[int32(*m.MetricFamily.Type)],
+				MetricType[int32(m.MetricFamily.GetType())],
 				mname,
 				labels,
 				help,
@@ -223,21 +223,21 @@ func (p *printer) printDefault() {
 		} else if p.addPosition || p.addModule {
 			lineArr = []string{
 				p.pos(m.Pos.String()),
-				MetricType[int32(*m.MetricFamily.Type)],
+				MetricType[int32(m.MetricFamily.GetType())],
 				mname,
 				labels,
 			}
 
 		} else if p.addHelp {
 			lineArr = []string{
-				MetricType[int32(*m.MetricFamily.Type)],
+				MetricType[int32(m.MetricFamily.GetType())],
 				mname,
 				labels,
 				help,
 			}
 		} else {
 			lineArr = []string{
-				MetricType[int32(*m.MetricFamily.Type)],
+				MetricType[int32(m.MetricFamily.GetType())],
 				mname,
 				labels,
 			}
@@ -314,35 +314,27 @@ type MetricForPrinting struct {
 }
 
 func toPrint(metrics []promlinter.MetricFamilyWithPos) []MetricForPrinting {
-	p := []MetricForPrinting{}
+	var p []MetricForPrinting
+
 	for _, m := range metrics {
 		if m.MetricFamily != nil && *m.MetricFamily.Name != "" {
 			if m.MetricFamily.Type == nil {
 				continue
 			}
-			n := ""
-			h := ""
-
-			if m.MetricFamily.Name != nil {
-				n = *m.MetricFamily.Name
-			}
-			if m.MetricFamily.Help != nil {
-				h = *m.MetricFamily.Help
-			}
 
 			var labels []string
-			for _, m := range m.MetricFamily.Metric {
-				for idx, _ := range m.Label {
+			for _, m := range m.MetricFamily.GetMetric() {
+				for idx, _ := range m.GetLabel() {
 					if m.Label[idx].Name != nil {
-						labels = append(labels, strings.Trim(*m.Label[idx].Name, `"`))
+						labels = append(labels, strings.Trim(m.Label[idx].GetName(), `"`))
 					}
 				}
 			}
 
 			i := MetricForPrinting{
-				Name:     n,
-				Help:     h,
-				Type:     MetricType[int32(*m.MetricFamily.Type)],
+				Name:     m.MetricFamily.GetName(),
+				Help:     m.MetricFamily.GetHelp(),
+				Type:     MetricType[int32(m.MetricFamily.GetType())],
 				Filename: m.Pos.Filename,
 				Line:     m.Pos.Line,
 				Column:   m.Pos.Column,
diff --git a/go.mod b/go.mod
index e8e6009..3bdadf1 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	github.com/prometheus/client_model v0.2.0
 	github.com/stretchr/testify v1.8.4
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
-	gopkg.in/yaml.v2 v2.4.0
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
@@ -23,5 +23,4 @@ require (
 	github.com/prometheus/procfs v0.7.3 // indirect
 	golang.org/x/sys v0.0.0-20220114195835-da31bd327af9 // indirect
 	google.golang.org/protobuf v1.26.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 28e1006..754ce6e 100644
--- a/go.sum
+++ b/go.sum
@@ -460,7 +460,6 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/promlinter.go b/promlinter.go
index 17a7f4c..986fdb2 100644
--- a/promlinter.go
+++ b/promlinter.go
@@ -84,15 +84,15 @@ type MetricFamilyWithPos struct {
 
 func (m *MetricFamilyWithPos) Labels() []string {
 	var arr []string
-	if len(m.MetricFamily.Metric) > 0 {
-		for _, label := range m.MetricFamily.Metric[0].Label {
+	if len(m.MetricFamily.GetMetric()) > 0 {
+		for _, label := range m.MetricFamily.Metric[0].GetLabel() {
 			if label.Value != nil {
 				arr = append(arr,
 					fmt.Sprintf("%s=%s",
-						strings.Trim(*label.Name, `"`),
-						strings.Trim(*label.Value, `"`)))
+						strings.Trim(label.GetName(), `"`),
+						strings.Trim(label.GetValue(), `"`)))
 			} else {
-				arr = append(arr, strings.Trim(*label.Name, `"`))
+				arr = append(arr, strings.Trim(label.GetName(), `"`))
 			}
 		}
 	}
@@ -301,7 +301,7 @@ func (v *visitor) parseOpts(optArgs []ast.Expr, metricType dto.MetricType) ast.V
 		// parse labels
 		if labelOpts := v.parseOptsExpr(optArgs[1]); labelOpts != nil && len(labelOpts.labels) > 0 {
 			metric = &dto.Metric{}
-			for idx, _ := range labelOpts.labels {
+			for idx := range labelOpts.labels {
 				metric.Label = append(metric.Label,
 					&dto.LabelPair{
 						Name: &labelOpts.labels[idx],
@@ -423,14 +423,14 @@ func (v *visitor) parseSendMetricChanExpr(chExpr *ast.SendStmt) ast.Visitor {
 
 	if len(descCall.labels) > 0 {
 		m := &dto.Metric{}
-		for idx, _ := range descCall.labels {
+		for idx := range descCall.labels {
 			m.Label = append(m.Label,
 				&dto.LabelPair{
 					Name: &descCall.labels[idx],
 				})
 		}
 
-		for idx, _ := range descCall.constLabels {
+		for idx := range descCall.constLabels {
 			m.Label = append(m.Label,
 				&dto.LabelPair{
 					Name:  &descCall.constLabels[idx][0],