diff --git a/pkg/accounting/cost_distribution_test.go b/pkg/accounting/cost_distribution_test.go
index 3addf28af..a2f980dd8 100644
--- a/pkg/accounting/cost_distribution_test.go
+++ b/pkg/accounting/cost_distribution_test.go
@@ -2,7 +2,7 @@ package accounting
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -16,7 +16,7 @@ func TestStockManager(t *testing.T) {
 	t.Run("testdata", func(t *testing.T) {
 		var trades []types.Trade
 
-		out, err := ioutil.ReadFile("testdata/btcusdt-trades.json")
+		out, err := os.ReadFile("testdata/btcusdt-trades.json")
 		assert.NoError(t, err)
 
 		err = json.Unmarshal(out, &trades)
diff --git a/pkg/backtest/exchange.go b/pkg/backtest/exchange.go
index 328cd6ffe..a5d63e4b2 100644
--- a/pkg/backtest/exchange.go
+++ b/pkg/backtest/exchange.go
@@ -136,12 +136,6 @@ func (e *Exchange) resetMatchingBooks() {
 	e.matchingBooksMutex.Unlock()
 }
 
-func (e *Exchange) addMatchingBook(symbol string, market types.Market) {
-	e.matchingBooksMutex.Lock()
-	e._addMatchingBook(symbol, market)
-	e.matchingBooksMutex.Unlock()
-}
-
 func (e *Exchange) _addMatchingBook(symbol string, market types.Market) {
 	matching := &SimplePriceMatching{
 		currentTime:     e.currentTime,
diff --git a/pkg/backtest/matching.go b/pkg/backtest/matching.go
index 57fe493a5..6de90a2c8 100644
--- a/pkg/backtest/matching.go
+++ b/pkg/backtest/matching.go
@@ -48,6 +48,7 @@ func init() {
 }
 
 // SimplePriceMatching implements a simple kline data driven matching engine for backtest
+//
 //go:generate callbackgen -type SimplePriceMatching
 type SimplePriceMatching struct {
 	Symbol string
diff --git a/pkg/backtest/report.go b/pkg/backtest/report.go
index bce827699..dc05b5987 100644
--- a/pkg/backtest/report.go
+++ b/pkg/backtest/report.go
@@ -3,7 +3,6 @@ package backtest
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -55,7 +54,7 @@ type SummaryReport struct {
 }
 
 func ReadSummaryReport(filename string) (*SummaryReport, error) {
-	o, err := ioutil.ReadFile(filename)
+	o, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
@@ -247,7 +246,7 @@ func loadReportIndexLocked(indexFilePath string) (*ReportIndex, error) {
 	if fileInfo, err := os.Stat(indexFilePath); err != nil {
 		return nil, err
 	} else if fileInfo.Size() != 0 {
-		o, err := ioutil.ReadFile(indexFilePath)
+		o, err := os.ReadFile(indexFilePath)
 		if err != nil {
 			return nil, err
 		}
diff --git a/pkg/bbgo/activeorderbook.go b/pkg/bbgo/activeorderbook.go
index 5240a9f7c..2bd0b3ad3 100644
--- a/pkg/bbgo/activeorderbook.go
+++ b/pkg/bbgo/activeorderbook.go
@@ -70,7 +70,7 @@ func (b *ActiveOrderBook) BindStream(stream types.Stream) {
 	stream.OnOrderUpdate(b.orderUpdateHandler)
 }
 
-func (b *ActiveOrderBook) waitClear(
+func (b *ActiveOrderBook) waitOrderClear(
 	ctx context.Context, order types.Order, waitTime, timeout time.Duration,
 ) (bool, error) {
 	if !b.orders.Exists(order.OrderID) {
diff --git a/pkg/bbgo/builder.go b/pkg/bbgo/builder.go
index f23babf92..68870b2eb 100644
--- a/pkg/bbgo/builder.go
+++ b/pkg/bbgo/builder.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -51,7 +50,7 @@ func generateRunFile(filepath string, config *Config, imports []string) error {
 		return err
 	}
 
-	return ioutil.WriteFile(filepath, buf.Bytes(), 0644)
+	return os.WriteFile(filepath, buf.Bytes(), 0644)
 }
 
 // compilePackage generates the main.go file of the wrapper package
@@ -80,7 +79,7 @@ func Build(ctx context.Context, userConfig *Config, targetConfig BuildTargetConf
 		buildDir = "build"
 	}
 
-	packageDir, err := ioutil.TempDir(buildDir, "bbgow-") // with prefix bbgow
+	packageDir, err := os.MkdirTemp(buildDir, "bbgow-") // with prefix bbgow
 	if err != nil {
 		return "", err
 	}
diff --git a/pkg/bbgo/config.go b/pkg/bbgo/config.go
index 2d9812912..697a733e2 100644
--- a/pkg/bbgo/config.go
+++ b/pkg/bbgo/config.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"reflect"
 	"runtime"
 	"strings"
@@ -496,7 +496,7 @@ func loadStash(config []byte) (Stash, error) {
 func LoadBuildConfig(configFile string) (*Config, error) {
 	var config Config
 
-	content, err := ioutil.ReadFile(configFile)
+	content, err := os.ReadFile(configFile)
 	if err != nil {
 		return nil, err
 	}
@@ -526,7 +526,7 @@ func LoadBuildConfig(configFile string) (*Config, error) {
 func Load(configFile string, loadStrategies bool) (*Config, error) {
 	var config Config
 
-	content, err := ioutil.ReadFile(configFile)
+	content, err := os.ReadFile(configFile)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/bbgo/config_test.go b/pkg/bbgo/config_test.go
index 2598a52fc..0b15546a4 100644
--- a/pkg/bbgo/config_test.go
+++ b/pkg/bbgo/config_test.go
@@ -2,7 +2,7 @@ package bbgo
 
 import (
 	"context"
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -128,7 +128,7 @@ func TestLoadConfig(t *testing.T) {
 				yamlText, err := config.YAML()
 				assert.NoError(t, err)
 
-				yamlTextSource, err := ioutil.ReadFile("testdata/strategy.yaml")
+				yamlTextSource, err := os.ReadFile("testdata/strategy.yaml")
 				assert.NoError(t, err)
 
 				var sourceMap map[string]interface{}
diff --git a/pkg/bbgo/environment.go b/pkg/bbgo/environment.go
index 07893aaad..fc8d245d2 100644
--- a/pkg/bbgo/environment.go
+++ b/pkg/bbgo/environment.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"fmt"
 	"image/png"
-	"io/ioutil"
 	stdlog "log"
 	"math/rand"
 	"os"
@@ -34,7 +33,7 @@ import (
 
 func init() {
 	// randomize pulling
-	rand.Seed(time.Now().UnixNano())
+	rand.New(rand.NewSource(time.Now().UnixNano()))
 }
 
 var defaultSyncBufferPeriod = 30 * time.Minute
@@ -69,8 +68,6 @@ func RegisterStrategy(key string, s interface{}) {
 	}
 }
 
-var emptyTime time.Time
-
 type SyncStatus int
 
 const (
@@ -971,7 +968,7 @@ func writeOTPKeyAsQRCodePNG(key *otp.Key, imagePath string) error {
 		return err
 	}
 
-	if err := ioutil.WriteFile(imagePath, buf.Bytes(), 0644); err != nil {
+	if err := os.WriteFile(imagePath, buf.Bytes(), 0644); err != nil {
 		return err
 	}
 
diff --git a/pkg/bbgo/interact.go b/pkg/bbgo/interact.go
index 133c1b13f..6cb84247d 100644
--- a/pkg/bbgo/interact.go
+++ b/pkg/bbgo/interact.go
@@ -5,8 +5,6 @@ import (
 	"fmt"
 	"path"
 	"reflect"
-	"strconv"
-	"strings"
 
 	"github.com/c9s/bbgo/pkg/dynamic"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
@@ -556,19 +554,6 @@ func getStrategySignature(strategy SingleExchangeStrategy) (string, error) {
 	return signature, nil
 }
 
-func parseFloatPercent(s string, bitSize int) (f float64, err error) {
-	i := strings.Index(s, "%")
-	if i < 0 {
-		return strconv.ParseFloat(s, bitSize)
-	}
-
-	f, err = strconv.ParseFloat(s[:i], bitSize)
-	if err != nil {
-		return 0, err
-	}
-	return f / 100.0, nil
-}
-
 func getStrategySignatures(exchangeStrategies map[string]SingleExchangeStrategy) []string {
 	var strategies []string
 	for signature := range exchangeStrategies {
diff --git a/pkg/bbgo/order_executor_simple.go b/pkg/bbgo/order_executor_simple.go
index 123cd03f1..ea61b3ccc 100644
--- a/pkg/bbgo/order_executor_simple.go
+++ b/pkg/bbgo/order_executor_simple.go
@@ -3,7 +3,6 @@ package bbgo
 import (
 	"context"
 
-	log "github.com/sirupsen/logrus"
 	"go.uber.org/multierr"
 
 	"github.com/c9s/bbgo/pkg/core"
@@ -14,8 +13,6 @@ import (
 // This order executor does not handle position and profit stats update
 type SimpleOrderExecutor struct {
 	BaseOrderExecutor
-
-	logger log.FieldLogger
 }
 
 func NewSimpleOrderExecutor(session *ExchangeSession) *SimpleOrderExecutor {
diff --git a/pkg/bbgo/reporter.go b/pkg/bbgo/reporter.go
index 910f1ba4f..fb1c02c2c 100644
--- a/pkg/bbgo/reporter.go
+++ b/pkg/bbgo/reporter.go
@@ -11,9 +11,8 @@ type PnLReporter interface {
 }
 
 type baseReporter struct {
-	notifier    Notifier
-	cron        *cron.Cron
-	environment *Environment
+	notifier Notifier
+	cron     *cron.Cron
 }
 
 type PnLReporterManager struct {
diff --git a/pkg/bbgo/session.go b/pkg/bbgo/session.go
index 22bcdc608..73adc39f5 100644
--- a/pkg/bbgo/session.go
+++ b/pkg/bbgo/session.go
@@ -209,6 +209,9 @@ func (session *ExchangeSession) Init(ctx context.Context, environ *Environment)
 	var err error
 	if util.SetEnvVarBool("DISABLE_MARKETS_CACHE", &disableMarketsCache); disableMarketsCache {
 		markets, err = session.Exchange.QueryMarkets(ctx)
+		if err != nil {
+			return err
+		}
 	} else {
 		markets, err = cache.LoadExchangeMarketsWithCache(ctx, session.Exchange)
 		if err != nil {
diff --git a/pkg/cache/cache.go b/pkg/cache/cache.go
index 81b688d19..2d864e17b 100644
--- a/pkg/cache/cache.go
+++ b/pkg/cache/cache.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"reflect"
@@ -99,7 +98,7 @@ func WithCache(key string, obj interface{}, fetcher DataFetcher) error {
 			return err
 		}
 
-		if err := ioutil.WriteFile(cacheFile, out, 0666); err != nil {
+		if err := os.WriteFile(cacheFile, out, 0666); err != nil {
 			return err
 		}
 
@@ -113,7 +112,7 @@ func WithCache(key string, obj interface{}, fetcher DataFetcher) error {
 	} else {
 		log.Debugf("cache %s found", cacheFile)
 
-		data, err := ioutil.ReadFile(cacheFile)
+		data, err := os.ReadFile(cacheFile)
 		if err != nil {
 			return err
 		}
diff --git a/pkg/cmd/hoptimize.go b/pkg/cmd/hoptimize.go
index 195ae3963..003b085e5 100644
--- a/pkg/cmd/hoptimize.go
+++ b/pkg/cmd/hoptimize.go
@@ -4,16 +4,16 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
 	"github.com/c9s/bbgo/pkg/optimizer"
 	"github.com/fatih/color"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"gopkg.in/yaml.v3"
-	"io/ioutil"
-	"os"
-	"os/signal"
-	"syscall"
-	"time"
 )
 
 func init() {
@@ -69,7 +69,7 @@ var hoptimizeCmd = &cobra.Command{
 			return err
 		}
 
-		yamlBody, err := ioutil.ReadFile(configFile)
+		yamlBody, err := os.ReadFile(configFile)
 		if err != nil {
 			return err
 		}
diff --git a/pkg/cmd/margin.go b/pkg/cmd/margin.go
index 542a905dd..7a5e97d95 100644
--- a/pkg/cmd/margin.go
+++ b/pkg/cmd/margin.go
@@ -37,11 +37,11 @@ var marginCmd = &cobra.Command{
 	Short:        "margin related history",
 	SilenceUsage: true,
 	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
-		if err := cobraLoadDotenv(cmd, args); err != nil {
+		if err := cobraLoadDotenv(cmd); err != nil {
 			return err
 		}
 
-		if err := cobraLoadConfig(cmd, args); err != nil {
+		if err := cobraLoadConfig(cmd); err != nil {
 			return err
 		}
 
diff --git a/pkg/cmd/optimize.go b/pkg/cmd/optimize.go
index a9af7f4e2..792f460e3 100644
--- a/pkg/cmd/optimize.go
+++ b/pkg/cmd/optimize.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -60,7 +59,7 @@ var optimizeCmd = &cobra.Command{
 			return err
 		}
 
-		yamlBody, err := ioutil.ReadFile(configFile)
+		yamlBody, err := os.ReadFile(configFile)
 		if err != nil {
 			return err
 		}
diff --git a/pkg/cmd/root.go b/pkg/cmd/root.go
index b9fe59f53..2b0ded1df 100644
--- a/pkg/cmd/root.go
+++ b/pkg/cmd/root.go
@@ -22,8 +22,6 @@ import (
 	"github.com/c9s/bbgo/pkg/util"
 
 	_ "time/tzdata"
-
-	_ "github.com/go-sql-driver/mysql"
 )
 
 var cpuProfileFile *os.File
@@ -38,7 +36,7 @@ var RootCmd = &cobra.Command{
 	SilenceUsage: true,
 
 	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
-		if err := cobraLoadDotenv(cmd, args); err != nil {
+		if err := cobraLoadDotenv(cmd); err != nil {
 			return err
 		}
 
@@ -101,7 +99,7 @@ var RootCmd = &cobra.Command{
 			}
 		}
 
-		return cobraLoadConfig(cmd, args)
+		return cobraLoadConfig(cmd)
 	},
 	PersistentPostRunE: func(cmd *cobra.Command, args []string) error {
 		pprof.StopCPUProfile()
@@ -116,7 +114,7 @@ var RootCmd = &cobra.Command{
 	},
 }
 
-func cobraLoadDotenv(cmd *cobra.Command, args []string) error {
+func cobraLoadDotenv(cmd *cobra.Command) error {
 	disableDotEnv, err := cmd.Flags().GetBool("no-dotenv")
 	if err != nil {
 		return err
@@ -137,7 +135,7 @@ func cobraLoadDotenv(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
-func cobraLoadConfig(cmd *cobra.Command, args []string) error {
+func cobraLoadConfig(cmd *cobra.Command) error {
 	configFile, err := cmd.Flags().GetString("config")
 	if err != nil {
 		return errors.Wrapf(err, "failed to get the config flag")
diff --git a/pkg/cmd/run.go b/pkg/cmd/run.go
index 92e1bbe8a..11cafc12c 100644
--- a/pkg/cmd/run.go
+++ b/pkg/cmd/run.go
@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"context"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -308,7 +307,7 @@ func runWrapperBinary(ctx context.Context, cmd *cobra.Command, userConfig *bbgo.
 
 // buildAndRun builds the package natively and run the binary with the given args
 func buildAndRun(ctx context.Context, userConfig *bbgo.Config, args ...string) (*exec.Cmd, error) {
-	packageDir, err := ioutil.TempDir("build", "bbgow")
+	packageDir, err := os.MkdirTemp("build", "bbgow")
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/cmd/utils.go b/pkg/cmd/utils.go
index eac567af2..3485cec48 100644
--- a/pkg/cmd/utils.go
+++ b/pkg/cmd/utils.go
@@ -1,11 +1,10 @@
 package cmd
 
 import (
-	log "github.com/sirupsen/logrus"
-	"github.com/spf13/cobra"
-
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
 )
 
 func cobraInitRequired(required []string) func(cmd *cobra.Command, args []string) error {
diff --git a/pkg/exchange/binance/parse.go b/pkg/exchange/binance/parse.go
index 48fe18012..891b74cac 100644
--- a/pkg/exchange/binance/parse.go
+++ b/pkg/exchange/binance/parse.go
@@ -867,7 +867,7 @@ type MarkPriceUpdateEvent struct {
 type ContinuousKLineEvent struct {
 	EventBase
 	Symbol string `json:"ps"`
-	ct     string `json:"ct"`
+	CT     string `json:"ct"`
 	KLine  KLine  `json:"k,omitempty"`
 }
 
diff --git a/pkg/optimizer/config.go b/pkg/optimizer/config.go
index 4d5e0515b..3f319fd20 100644
--- a/pkg/optimizer/config.go
+++ b/pkg/optimizer/config.go
@@ -2,7 +2,7 @@ package optimizer
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"gopkg.in/yaml.v3"
@@ -57,7 +57,7 @@ var defaultLocalExecutorConfig = &LocalExecutorConfig{
 }
 
 func LoadConfig(yamlConfigFileName string) (*Config, error) {
-	configYaml, err := ioutil.ReadFile(yamlConfigFileName)
+	configYaml, err := os.ReadFile(yamlConfigFileName)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/server/routes.go b/pkg/server/routes.go
index 6502c17e1..6968a40fd 100644
--- a/pkg/server/routes.go
+++ b/pkg/server/routes.go
@@ -3,12 +3,10 @@ package server
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"net"
 	"net/http"
 	"os"
-	"regexp"
 	"strconv"
 	"time"
 
@@ -525,7 +523,7 @@ func (s *Server) setupSaveConfig(c *gin.Context) {
 		return
 	}
 
-	if err := ioutil.WriteFile(filename, out, 0666); err != nil {
+	if err := os.WriteFile(filename, out, 0666); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
@@ -533,7 +531,7 @@ func (s *Server) setupSaveConfig(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"success": true})
 }
 
-var pageRoutePattern = regexp.MustCompile("/[a-z]+$")
+// var pageRoutePattern = regexp.MustCompile("/[a-z]+$")
 
 func moveFileToBackup(filename string) error {
 	stat, err := os.Stat(filename)
diff --git a/pkg/service/persistence_json.go b/pkg/service/persistence_json.go
index 3bea74556..a2595504c 100644
--- a/pkg/service/persistence_json.go
+++ b/pkg/service/persistence_json.go
@@ -2,7 +2,6 @@ package service
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 )
@@ -49,7 +48,7 @@ func (store JsonStore) Load(val interface{}) error {
 		return ErrPersistenceNotExists
 	}
 
-	data, err := ioutil.ReadFile(p)
+	data, err := os.ReadFile(p)
 	if err != nil {
 		return err
 	}
@@ -74,5 +73,5 @@ func (store JsonStore) Save(val interface{}) error {
 	}
 
 	p := filepath.Join(store.Directory, store.ID) + ".json"
-	return ioutil.WriteFile(p, data, 0666)
+	return os.WriteFile(p, data, 0666)
 }
diff --git a/pkg/strategy/grid2/grid_recover_test.go b/pkg/strategy/grid2/grid_recover_test.go
index 997cac9e5..d22e91f39 100644
--- a/pkg/strategy/grid2/grid_recover_test.go
+++ b/pkg/strategy/grid2/grid_recover_test.go
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"sort"
 	"strconv"
@@ -108,7 +107,7 @@ func NewTestDataService(t *TestData) *TestDataService {
 }
 
 func readSpec(fileName string) (*TestData, error) {
-	content, err := ioutil.ReadFile(fileName)
+	content, err := os.ReadFile(fileName)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/util/http_response.go b/pkg/util/http_response.go
index 392f14b6f..1ddffb3d7 100644
--- a/pkg/util/http_response.go
+++ b/pkg/util/http_response.go
@@ -2,7 +2,7 @@ package util
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 )
 
@@ -17,7 +17,7 @@ type Response struct {
 
 // NewResponse is a wrapper of the http.Response instance, it reads the response body and close the file.
 func NewResponse(r *http.Response) (response *Response, err error) {
-	body, err := ioutil.ReadAll(r.Body)
+	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/util/http_response_test.go b/pkg/util/http_response_test.go
index af864f825..6c3d55fe8 100644
--- a/pkg/util/http_response_test.go
+++ b/pkg/util/http_response_test.go
@@ -2,7 +2,7 @@ package util
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"testing"
 
@@ -14,7 +14,7 @@ func TestResponse_DecodeJSON(t *testing.T) {
 		Name string `json:"name"`
 	}
 	json := `{"name":"Test Name","a":"a"}`
-	reader := ioutil.NopCloser(bytes.NewReader([]byte(json)))
+	reader := io.NopCloser(bytes.NewReader([]byte(json)))
 	resp, err := NewResponse(&http.Response{
 		StatusCode: 200,
 		Body:       reader,
diff --git a/pkg/util/json.go b/pkg/util/json.go
index b11dd89b6..1d31f7308 100644
--- a/pkg/util/json.go
+++ b/pkg/util/json.go
@@ -3,7 +3,6 @@ package util
 import (
 	"encoding/json"
 	"io"
-	"io/ioutil"
 	"os"
 )
 
@@ -13,7 +12,7 @@ func WriteJsonFile(p string, obj interface{}) error {
 		return err
 	}
 
-	return ioutil.WriteFile(p, out, 0644)
+	return os.WriteFile(p, out, 0644)
 }
 
 func ReadJsonFile(file string, obj interface{}) error {
diff --git a/utils/embed/main.go b/utils/embed/main.go
index 1d45db115..6f23354b7 100644
--- a/utils/embed/main.go
+++ b/utils/embed/main.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -119,14 +118,14 @@ func Embed(file string, dirs ...string) error {
 
 			log.Printf("packing %s...", path)
 
-			b, err := ioutil.ReadFile(path)
+			b, err := os.ReadFile(path)
 			if err != nil {
 				return err
 			}
 
 			path = filepath.ToSlash(path)
 			fmt.Fprintf(w, `	assets[%q] = []byte{`, strings.TrimPrefix(path, dir))
-			fmt.Fprintf(w, formatBytes(b))
+			fmt.Fprint(w, formatBytes(b))
 			fmt.Fprintln(w, `}`)
 			return nil
 		})