diff --git a/br/pkg/storage/memstore_test.go b/br/pkg/storage/memstore_test.go
index a85a2ff467fa1..3ae9a08d168bc 100644
--- a/br/pkg/storage/memstore_test.go
+++ b/br/pkg/storage/memstore_test.go
@@ -17,7 +17,6 @@ import (
 	"bytes"
 	"context"
 	"io"
-	"io/ioutil"
 	"sync"
 	"testing"
 	"time"
@@ -70,7 +69,7 @@ func TestMemStoreBasic(t *testing.T) {
 	require.Nil(t, err)
 	r2, err := store.Open(ctx, "/hello.txt")
 	require.Nil(t, err)
-	fileContent, err = ioutil.ReadAll(r)
+	fileContent, err = io.ReadAll(r)
 	require.Nil(t, err)
 	require.True(t, bytes.Equal([]byte("hello world 3"), fileContent))
 	require.Nil(t, r.Close())
@@ -83,7 +82,7 @@ func TestMemStoreBasic(t *testing.T) {
 
 	_, err = r2.Seek(5, io.SeekStart)
 	require.Nil(t, err)
-	fileContent, err = ioutil.ReadAll(r2)
+	fileContent, err = io.ReadAll(r2)
 	require.Nil(t, err)
 	require.True(t, bytes.Equal([]byte(" world 3"), fileContent))
 
diff --git a/executor/set_test.go b/executor/set_test.go
index 75b6c210146b7..c24e8226a03bf 100644
--- a/executor/set_test.go
+++ b/executor/set_test.go
@@ -20,7 +20,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strconv"
 	"testing"
@@ -1802,7 +1801,7 @@ func TestSetClusterConfig(t *testing.T) {
 	httpCnt = 0
 	tk.Session().SetValue(executor.TestSetConfigHTTPHandlerKey, func(req *http.Request) (*http.Response, error) {
 		httpCnt++
-		body, err := ioutil.ReadAll(req.Body)
+		body, err := io.ReadAll(req.Body)
 		require.NoError(t, err)
 		// The `raftstore.` prefix is stripped.
 		require.JSONEq(t, `{"server.snap-max-write-bytes-per-sec":"500MB"}`, string(body))
diff --git a/parser/consistent_test.go b/parser/consistent_test.go
index e78b7f31ddddd..1acc1a58bc850 100644
--- a/parser/consistent_test.go
+++ b/parser/consistent_test.go
@@ -14,7 +14,7 @@
 package parser
 
 import (
-	"io/ioutil"
+	gio "io"
 	"os"
 	"sort"
 	"strings"
@@ -27,7 +27,7 @@ func TestKeywordConsistent(t *testing.T) {
 	parserFilename := "parser.y"
 	parserFile, err := os.Open(parserFilename)
 	requires.NoError(t, err)
-	data, err := ioutil.ReadAll(parserFile)
+	data, err := gio.ReadAll(parserFile)
 	requires.NoError(t, err)
 	content := string(data)
 
diff --git a/parser/format/format_test.go b/parser/format/format_test.go
index 429c2c27c19d1..bc04033214cdd 100644
--- a/parser/format/format_test.go
+++ b/parser/format/format_test.go
@@ -15,7 +15,7 @@ package format
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -26,7 +26,7 @@ import (
 func checkFormat(t *testing.T, f Formatter, buf *bytes.Buffer, str, expect string) {
 	_, err := f.Format(str, 3)
 	require.NoError(t, err)
-	b, err := ioutil.ReadAll(buf)
+	b, err := io.ReadAll(buf)
 	require.NoError(t, err)
 	require.Equal(t, expect, string(b))
 }
diff --git a/parser/reserved_words_test.go b/parser/reserved_words_test.go
index f58359a7d20a3..6896167741284 100644
--- a/parser/reserved_words_test.go
+++ b/parser/reserved_words_test.go
@@ -28,7 +28,7 @@ import (
 	// needed to connect to MySQL
 
 	dbsql "database/sql"
-	"io/ioutil"
+	gio "io"
 	"os"
 	"testing"
 
@@ -41,7 +41,7 @@ func TestCompareReservedWordsWithMySQL(t *testing.T) {
 	parserFilename := "parser.y"
 	parserFile, err := os.Open(parserFilename)
 	requires.NoError(t, err)
-	data, err := ioutil.ReadAll(parserFile)
+	data, err := gio.ReadAll(parserFile)
 	requires.NoError(t, err)
 	content := string(data)
 
diff --git a/planner/core/binary_plan_test.go b/planner/core/binary_plan_test.go
index 806e750d33fac..be8bf75378dc7 100644
--- a/planner/core/binary_plan_test.go
+++ b/planner/core/binary_plan_test.go
@@ -17,7 +17,7 @@ package core_test
 import (
 	"encoding/base64"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"regexp"
 	"strings"
@@ -521,7 +521,7 @@ func TestUnnecessaryBinaryPlanInSlowLog(t *testing.T) {
 	tk.MustExec("drop table if exists th")
 	tk.MustExec("set global tidb_slow_log_threshold = 1;")
 	tk.MustExec("create table th (i int, a int,b int, c int, index (a)) partition by hash (a) partitions 100;")
-	slowLogBytes, err := ioutil.ReadAll(f)
+	slowLogBytes, err := io.ReadAll(f)
 	require.NoError(t, err)
 	require.NotContains(t, string(slowLogBytes), `tidb_decode_binary_plan('')`)
 }
diff --git a/server/plan_replayer.go b/server/plan_replayer.go
index 30a00e4eda112..7bfb680a756ba 100644
--- a/server/plan_replayer.go
+++ b/server/plan_replayer.go
@@ -16,7 +16,7 @@ package server
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -83,7 +83,7 @@ func handleDownloadFile(handler downloadFileHandler, w http.ResponseWriter, req
 			writeError(w, err)
 			return
 		}
-		content, err := ioutil.ReadAll(file)
+		content, err := io.ReadAll(file)
 		if err != nil {
 			writeError(w, err)
 			return
@@ -137,7 +137,7 @@ func handleDownloadFile(handler downloadFileHandler, w http.ResponseWriter, req
 				zap.String("remote-addr", remoteAddr), zap.Int("status-code", resp.StatusCode))
 			continue
 		}
-		content, err := ioutil.ReadAll(resp.Body)
+		content, err := io.ReadAll(resp.Body)
 		if err != nil {
 			writeError(w, err)
 			return
diff --git a/server/plan_replayer_test.go b/server/plan_replayer_test.go
index 2a00bc0db04de..2f2308efdd1a9 100644
--- a/server/plan_replayer_test.go
+++ b/server/plan_replayer_test.go
@@ -18,7 +18,6 @@ import (
 	"bytes"
 	"database/sql"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -69,7 +68,7 @@ func TestDumpPlanReplayerAPI(t *testing.T) {
 		require.NoError(t, resp0.Body.Close())
 	}()
 
-	body, err := ioutil.ReadAll(resp0.Body)
+	body, err := io.ReadAll(resp0.Body)
 	require.NoError(t, err)
 
 	path := "/tmp/plan_replayer.zip"
diff --git a/statistics/handle/dump.go b/statistics/handle/dump.go
index 546916751c32d..f663ab9d726f9 100644
--- a/statistics/handle/dump.go
+++ b/statistics/handle/dump.go
@@ -19,7 +19,7 @@ import (
 	"compress/gzip"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"time"
 
 	"github.com/pingcap/errors"
@@ -501,7 +501,7 @@ func BlocksToJSONTable(blocks [][]byte) (*JSONTable, error) {
 	if err := gzipReader.Close(); err != nil {
 		return nil, err
 	}
-	jsonStr, err := ioutil.ReadAll(gzipReader)
+	jsonStr, err := io.ReadAll(gzipReader)
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
diff --git a/util/cpuprofile/cpuprofile_test.go b/util/cpuprofile/cpuprofile_test.go
index 2d400264ede10..b20428dcf21fd 100644
--- a/util/cpuprofile/cpuprofile_test.go
+++ b/util/cpuprofile/cpuprofile_test.go
@@ -18,7 +18,6 @@ import (
 	"bytes"
 	"context"
 	"io"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"runtime/pprof"
@@ -237,7 +236,7 @@ func TestProfileHTTPHandler(t *testing.T) {
 	resp, err = http.Get("http://" + address + "/debug/pprof/profile?seconds=100000")
 	require.NoError(t, err)
 	require.Equal(t, 400, resp.StatusCode)
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	require.NoError(t, err)
 	require.Equal(t, "profile duration exceeds server's WriteTimeout\n", string(body))
 	require.NoError(t, resp.Body.Close())