diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 90d4ab61..b190c0fb 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -11,12 +11,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.18', '1.21' ]
+        go: [ '1.21' ]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go }}
 
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index 1169dd43..4fdc07a5 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -14,18 +14,18 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.18' ]
+        go: [ '1.21' ]
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run golangci-lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v4
         with:
           # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
-          version: v1.45.2
+          version: v1.57.2
 
           # Optional: working directory, useful for monorepos
           # working-directory: somedir
diff --git a/go.mod b/go.mod
index fd68b43a..a4600266 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/free5gc/n3iwf
 
-go 1.17
+go 1.21
 
 require (
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
diff --git a/go.sum b/go.sum
index 5907a1b7..18c70617 100644
--- a/go.sum
+++ b/go.sum
@@ -55,6 +55,7 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
 github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
+github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
 github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
 github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
diff --git a/internal/ngap/handler/handler.go b/internal/ngap/handler/handler.go
index c3852d09..73118a6d 100644
--- a/internal/ngap/handler/handler.go
+++ b/internal/ngap/handler/handler.go
@@ -1715,7 +1715,7 @@ func handlePDUSessionResourceModifyRequestTransfer(
 		}
 
 		responseTransfer = unsuccessfulTransfer
-		return
+		return success, responseTransfer
 	}
 
 	if ulNGUUPTNLModifyList != nil {
diff --git a/internal/ngap/message/3gpp_type.go b/internal/ngap/message/3gpp_type.go
index 56f2651b..f225e0b9 100644
--- a/internal/ngap/message/3gpp_type.go
+++ b/internal/ngap/message/3gpp_type.go
@@ -76,7 +76,7 @@ func UnmarshalEAP5GData(codedData []byte) (anParameters *ANParameters, nasPDU []
 							guamiField = append(guamiField, parameterValue...)
 							// Decode GUAMI using aper
 							ngapGUAMI := new(ngapType.GUAMI)
-							err := aper.UnmarshalWithParams(guamiField, ngapGUAMI, "valueExt")
+							err = aper.UnmarshalWithParams(guamiField, ngapGUAMI, "valueExt")
 							if err != nil {
 								logger.NgapLog.Errorf("APER unmarshal with parameter failed: %+v", err)
 								return nil, nil, errors.New("Unmarshal failed when decoding GUAMI")
@@ -109,7 +109,7 @@ func UnmarshalEAP5GData(codedData []byte) (anParameters *ANParameters, nasPDU []
 							plmnField = append(plmnField, parameterValue...)
 							// Decode PLMN using aper
 							ngapPLMN := new(ngapType.PLMNIdentity)
-							err := aper.UnmarshalWithParams(plmnField, ngapPLMN, "valueExt")
+							err = aper.UnmarshalWithParams(plmnField, ngapPLMN, "valueExt")
 							if err != nil {
 								logger.NgapLog.Errorf("APER unmarshal with parameter failed: %v", err)
 								return nil, nil, errors.New("Unmarshal failed when decoding PLMN")
@@ -275,7 +275,7 @@ func UnmarshalEAP5GData(codedData []byte) (anParameters *ANParameters, nasPDU []
 			return nil, nil, errors.New("Error formatting")
 		}
 
-		return
+		return anParameters, nasPDU, err
 	} else {
 		return nil, nil, errors.New("No data to decode")
 	}
diff --git a/pkg/context/context.go b/pkg/context/context.go
index 2f73b902..03bd3c1c 100644
--- a/pkg/context/context.go
+++ b/pkg/context/context.go
@@ -8,10 +8,10 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"fmt"
-	"io/ioutil"
 	"math"
 	"math/big"
 	"net"
+	"os"
 	"strings"
 	"sync"
 
@@ -178,7 +178,7 @@ func InitN3IWFContext() bool {
 			keyPath = factory.N3iwfConfig.Configuration.PrivateKey
 		}
 
-		content, err := ioutil.ReadFile(keyPath)
+		content, err := os.ReadFile(keyPath)
 		if err != nil {
 			logger.CtxLog.Errorf("Cannot read private key data from file: %+v", err)
 			return false
@@ -220,7 +220,7 @@ func InitN3IWFContext() bool {
 		}
 
 		// Read .pem
-		content, err := ioutil.ReadFile(keyPath)
+		content, err := os.ReadFile(keyPath)
 		if err != nil {
 			logger.CtxLog.Errorf("Cannot read certificate authority data from file: %+v", err)
 			return false
@@ -259,7 +259,7 @@ func InitN3IWFContext() bool {
 		}
 
 		// Read .pem
-		content, err := ioutil.ReadFile(keyPath)
+		content, err := os.ReadFile(keyPath)
 		if err != nil {
 			logger.CtxLog.Errorf("Cannot read certificate data from file: %+v", err)
 			return false
diff --git a/pkg/factory/factory.go b/pkg/factory/factory.go
index 5f35a85a..ca6c6e1f 100644
--- a/pkg/factory/factory.go
+++ b/pkg/factory/factory.go
@@ -6,7 +6,7 @@ package factory
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/asaskevich/govalidator"
 	yaml "gopkg.in/yaml.v2"
@@ -23,7 +23,7 @@ func InitConfigFactory(f string, cfg *Config) error {
 		f = N3iwfDefaultConfigPath
 	}
 
-	if content, err := ioutil.ReadFile(f); err != nil {
+	if content, err := os.ReadFile(f); err != nil {
 		return fmt.Errorf("[Factory] %+v", err)
 	} else {
 		logger.CfgLog.Infof("Read config from [%s]", f)
diff --git a/pkg/ike/handler/3gpp_types.go b/pkg/ike/handler/3gpp_types.go
index 464462ec..637cf853 100644
--- a/pkg/ike/handler/3gpp_types.go
+++ b/pkg/ike/handler/3gpp_types.go
@@ -27,7 +27,7 @@ func UnmarshalEAP5GData(codedData []byte) (eap5GMessageID uint8, anParameters *A
 		eap5GMessageID = codedData[0]
 		logger.IKELog.Debugf("Message-Id: %d", eap5GMessageID)
 		if eap5GMessageID == message.EAP5GType5GStop {
-			return
+			return eap5GMessageID, anParameters, nasPDU, err
 		}
 
 		codedData = codedData[2:]
@@ -83,7 +83,7 @@ func UnmarshalEAP5GData(codedData []byte) (eap5GMessageID uint8, anParameters *A
 							guamiField = append(guamiField, parameterValue...)
 							// Decode GUAMI using aper
 							ngapGUAMI := new(ngapType.GUAMI)
-							err := aper.UnmarshalWithParams(guamiField, ngapGUAMI, "valueExt")
+							err = aper.UnmarshalWithParams(guamiField, ngapGUAMI, "valueExt")
 							if err != nil {
 								logger.IKELog.Errorf("APER unmarshal with parameter failed: %+v", err)
 								return 0, nil, nil, errors.New("Unmarshal failed when decoding GUAMI")
@@ -116,7 +116,7 @@ func UnmarshalEAP5GData(codedData []byte) (eap5GMessageID uint8, anParameters *A
 							plmnField = append(plmnField, parameterValue...)
 							// Decode PLMN using aper
 							ngapPLMN := new(ngapType.PLMNIdentity)
-							err := aper.UnmarshalWithParams(plmnField, ngapPLMN, "valueExt")
+							err = aper.UnmarshalWithParams(plmnField, ngapPLMN, "valueExt")
 							if err != nil {
 								logger.IKELog.Errorf("APER unmarshal with parameter failed: %v", err)
 								return 0, nil, nil, errors.New("Unmarshal failed when decoding PLMN")
@@ -281,8 +281,7 @@ func UnmarshalEAP5GData(codedData []byte) (eap5GMessageID uint8, anParameters *A
 			logger.IKELog.Error("No NASPDU length specified")
 			return 0, nil, nil, errors.New("Error formatting")
 		}
-
-		return
+		return eap5GMessageID, anParameters, nasPDU, err
 	} else {
 		return 0, nil, nil, errors.New("No data to decode")
 	}
diff --git a/pkg/ike/handler/security.go b/pkg/ike/handler/security.go
index 810e7248..57bb2acf 100644
--- a/pkg/ike/handler/security.go
+++ b/pkg/ike/handler/security.go
@@ -116,7 +116,7 @@ func CalculateDiffieHellmanMaterials(secret *big.Int, peerPublicValue []byte,
 		}
 	default:
 		logger.IKELog.Errorf("Unsupported Diffie-Hellman group: %d", diffieHellmanGroupNumber)
-		return
+		return localPublicValue, sharedKey
 	}
 
 	localPublicValue = new(big.Int).Exp(generator, secret, factor).Bytes()
diff --git a/pkg/service/init.go b/pkg/service/init.go
index 0389b685..e0e16cb4 100644
--- a/pkg/service/init.go
+++ b/pkg/service/init.go
@@ -3,7 +3,7 @@ package service
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"os"
 	"os/signal"
@@ -43,7 +43,7 @@ func (a *N3iwfApp) SetLogEnable(enable bool) {
 	logger.MainLog.Infof("Log enable is set to [%v]", enable)
 	if enable && logger.Log.Out == os.Stderr {
 		return
-	} else if !enable && logger.Log.Out == ioutil.Discard {
+	} else if !enable && logger.Log.Out == io.Discard {
 		return
 	}
 
@@ -51,7 +51,7 @@ func (a *N3iwfApp) SetLogEnable(enable bool) {
 	if enable {
 		logger.Log.SetOutput(os.Stderr)
 	} else {
-		logger.Log.SetOutput(ioutil.Discard)
+		logger.Log.SetOutput(io.Discard)
 	}
 }