diff --git a/app/dns/nameserver_doh.go b/app/dns/nameserver_doh.go
index d7ecf66c6..fc6d30588 100644
--- a/app/dns/nameserver_doh.go
+++ b/app/dns/nameserver_doh.go
@@ -8,7 +8,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"sync"
diff --git a/common/common.go b/common/common.go
index 035fafc01..edb9e74a6 100644
--- a/common/common.go
+++ b/common/common.go
@@ -5,7 +5,7 @@ package common
 import (
 	"fmt"
 	"go/build"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -70,7 +70,7 @@ func GetRuntimeEnv(key string) (string, error) {
 	}
 	var data []byte
 	var runtimeEnv string
-	data, readErr := ioutil.ReadFile(file)
+	data, readErr := os.ReadFile(file)
 	if readErr != nil {
 		return "", readErr
 	}
diff --git a/common/drain/drainer.go b/common/drain/drainer.go
index 71c3db221..e92c4363d 100644
--- a/common/drain/drainer.go
+++ b/common/drain/drainer.go
@@ -2,7 +2,6 @@ package drain
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/v2fly/v2ray-core/v4/common/dice"
 )
diff --git a/infra/conf/mergers/merge.go b/infra/conf/mergers/merge.go
index 38c3d323e..c2b041635 100644
--- a/infra/conf/mergers/merge.go
+++ b/infra/conf/mergers/merge.go
@@ -2,7 +2,6 @@ package mergers
 
 import (
 	"io"
-	"io/ioutil"
 	"path/filepath"
 	"strings"
 
diff --git a/infra/conf/mergers/merger_base.go b/infra/conf/mergers/merger_base.go
index 125a922ab..72a40d0cc 100644
--- a/infra/conf/mergers/merger_base.go
+++ b/infra/conf/mergers/merger_base.go
@@ -3,7 +3,6 @@ package mergers
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 
 	"github.com/v2fly/v2ray-core/v4/common/cmdarg"
 	"github.com/v2fly/v2ray-core/v4/infra/conf/merge"