diff --git a/common/common.go b/common/common.go
index c00371be..a09f6fbe 100644
--- a/common/common.go
+++ b/common/common.go
@@ -38,7 +38,7 @@ func Error2(v interface{}, err error) error {
 func envFile() (string, error) {
 	if file := os.Getenv("GOENV"); file != "" {
 		if file == "off" {
-			return "", fmt.Errorf("GOENV=off")
+			return "", errors.New("GOENV=off")
 		}
 		return file, nil
 	}
@@ -47,7 +47,7 @@ func envFile() (string, error) {
 		return "", err
 	}
 	if dir == "" {
-		return "", fmt.Errorf("missing user-config dir")
+		return "", errors.New("missing user-config dir")
 	}
 	return filepath.Join(dir, "go", "env"), nil
 }
@@ -60,7 +60,7 @@ func GetRuntimeEnv(key string) (string, error) {
 		return "", err
 	}
 	if file == "" {
-		return "", fmt.Errorf("missing runtime env file")
+		return "", errors.New("missing runtime env file")
 	}
 	var data []byte
 	var runtimeEnv string
diff --git a/infra/vformat/main.go b/infra/vformat/main.go
index e676f08a..84c63a42 100644
--- a/infra/vformat/main.go
+++ b/infra/vformat/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"go/build"
@@ -18,7 +19,7 @@ var directory = flag.String("pwd", "", "Working directory of Xray vformat.")
 func envFile() (string, error) {
 	if file := os.Getenv("GOENV"); file != "" {
 		if file == "off" {
-			return "", fmt.Errorf("GOENV=off")
+			return "", errors.New("GOENV=off")
 		}
 		return file, nil
 	}
@@ -27,7 +28,7 @@ func envFile() (string, error) {
 		return "", err
 	}
 	if dir == "" {
-		return "", fmt.Errorf("missing user-config dir")
+		return "", errors.New("missing user-config dir")
 	}
 	return filepath.Join(dir, "go", "env"), nil
 }
@@ -40,7 +41,7 @@ func GetRuntimeEnv(key string) (string, error) {
 		return "", err
 	}
 	if file == "" {
-		return "", fmt.Errorf("missing runtime env file")
+		return "", errors.New("missing runtime env file")
 	}
 	var data []byte
 	var runtimeEnv string
diff --git a/infra/vprotogen/main.go b/infra/vprotogen/main.go
index f62ae4ae..f5a4152a 100644
--- a/infra/vprotogen/main.go
+++ b/infra/vprotogen/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"go/build"
@@ -22,7 +23,7 @@ var directory = flag.String("pwd", "", "Working directory of Xray vprotogen.")
 func envFile() (string, error) {
 	if file := os.Getenv("GOENV"); file != "" {
 		if file == "off" {
-			return "", fmt.Errorf("GOENV=off")
+			return "", errors.New("GOENV=off")
 		}
 		return file, nil
 	}
@@ -31,7 +32,7 @@ func envFile() (string, error) {
 		return "", err
 	}
 	if dir == "" {
-		return "", fmt.Errorf("missing user-config dir")
+		return "", errors.New("missing user-config dir")
 	}
 	return filepath.Join(dir, "go", "env"), nil
 }
@@ -44,7 +45,7 @@ func GetRuntimeEnv(key string) (string, error) {
 		return "", err
 	}
 	if file == "" {
-		return "", fmt.Errorf("missing runtime env file")
+		return "", errors.New("missing runtime env file")
 	}
 	var data []byte
 	var runtimeEnv string
@@ -101,12 +102,12 @@ Download %s v%s or later from https://github.com/protocolbuffers/protobuf/releas
 func getProjectProtocVersion(url string) (string, error) {
 	resp, err := http.Get(url)
 	if err != nil {
-		return "", fmt.Errorf("can not get the version of protobuf used in xray project")
+		return "", errors.New("can not get the version of protobuf used in xray project")
 	}
 	defer resp.Body.Close()
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
-		return "", fmt.Errorf("can not read from body")
+		return "", errors.New("can not read from body")
 	}
 	versionRegexp := regexp.MustCompile(`\/\/\s*protoc\s*v\d+\.(\d+\.\d+)`)
 	matched := versionRegexp.FindStringSubmatch(string(body))
diff --git a/main/commands/all/api/shared.go b/main/commands/all/api/shared.go
index f9d18265..79f4171a 100644
--- a/main/commands/all/api/shared.go
+++ b/main/commands/all/api/shared.go
@@ -3,6 +3,7 @@ package api
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -101,7 +102,7 @@ func fetchHTTPContent(target string) ([]byte, error) {
 
 	content, err := buf.ReadAllToBytes(resp.Body)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read HTTP response")
+		return nil, errors.New("failed to read HTTP response")
 	}
 
 	return content, nil