diff --git a/config/config.go b/config/config.go
index 044df58..67a531f 100644
--- a/config/config.go
+++ b/config/config.go
@@ -3,7 +3,7 @@ package config
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"runtime"
 	"strings"
 
@@ -308,7 +308,7 @@ func LoadConf(confPath ...string) (*ConfYaml, error) {
 	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 
 	if len(confPath) > 0 && confPath[0] != "" {
-		content, err := ioutil.ReadFile(confPath[0])
+		content, err := os.ReadFile(confPath[0])
 		if err != nil {
 			return conf, err
 		}
diff --git a/notify/notification_apns.go b/notify/notification_apns.go
index 1ddb9b6..a447094 100644
--- a/notify/notification_apns.go
+++ b/notify/notification_apns.go
@@ -159,6 +159,7 @@ func newApnsClient(cfg *config.ConfYaml, certificate tls.Certificate) (*apns2.Cl
 	}
 
 	if len(certificate.Certificate) > 0 {
+		//nolint:staticcheck
 		tlsConfig.BuildNameToCertificate()
 	}
 
diff --git a/router/server_test.go b/router/server_test.go
index fb2f1ee..bee80e8 100644
--- a/router/server_test.go
+++ b/router/server_test.go
@@ -3,7 +3,7 @@ package router
 import (
 	"context"
 	"crypto/tls"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"os"
@@ -84,7 +84,7 @@ func testRequest(t *testing.T, url string) {
 
 	assert.NoError(t, err)
 
-	_, ioerr := ioutil.ReadAll(resp.Body)
+	_, ioerr := io.ReadAll(resp.Body)
 	assert.NoError(t, ioerr)
 	assert.Equal(t, "200 OK", resp.Status, "should get a 200")
 }
diff --git a/rpc/example/go/health/main.go b/rpc/example/go/health/main.go
index 91d66f2..9a9b62a 100644
--- a/rpc/example/go/health/main.go
+++ b/rpc/example/go/health/main.go
@@ -8,6 +8,7 @@ import (
 	"github.com/appleboy/gorush/rpc"
 
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/status"
 )
 
@@ -17,7 +18,7 @@ const (
 
 func main() {
 	// Set up a connection to the server.
-	conn, err := grpc.Dial(address, grpc.WithInsecure())
+	conn, err := grpc.Dial(address, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		log.Fatalf("did not connect: %v", err)
 	}
diff --git a/rpc/example/go/send/main.go b/rpc/example/go/send/main.go
index f9b0581..437ee30 100644
--- a/rpc/example/go/send/main.go
+++ b/rpc/example/go/send/main.go
@@ -8,6 +8,7 @@ import (
 
 	structpb "github.com/golang/protobuf/ptypes/struct"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 const (
@@ -16,7 +17,7 @@ const (
 
 func main() {
 	// Set up a connection to the server.
-	conn, err := grpc.Dial(address, grpc.WithInsecure())
+	conn, err := grpc.Dial(address, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		log.Fatalf("did not connect: %v", err)
 	}
diff --git a/rpc/server_test.go b/rpc/server_test.go
index 5d72061..7dcdaac 100644
--- a/rpc/server_test.go
+++ b/rpc/server_test.go
@@ -8,6 +8,7 @@ import (
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 const gRPCAddr = "localhost:9000"
@@ -35,7 +36,7 @@ func TestGracefulShutDownGRPCServer(t *testing.T) {
 	// gRPC client conn
 	conn, err := grpc.Dial(
 		gRPCAddr,
-		grpc.WithInsecure(),
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
 		grpc.WithDefaultCallOptions(grpc.WaitForReady(true)),
 	) // wait for server ready
 	if err != nil {