diff --git a/build/update-license.go b/build/update-license.go
index 70e2de06c7..79590aa92b 100644
--- a/build/update-license.go
+++ b/build/update-license.go
@@ -295,7 +295,7 @@ func writeAuthors(files []string) {
 	slices.SortFunc(list, func(a, b string) bool {
 		return strings.ToLower(a) < strings.ToLower(b)
 	})
-	content := new(bytes.Buffer)
+	content := new(strings.Builder)
 	content.WriteString(authorsFileHeader)
 	for _, a := range list {
 		content.WriteString(a)
@@ -386,7 +386,7 @@ func writeLicense(info *info) {
 		log.Fatalf("error reading %s: %v\n", info.file, err)
 	}
 	// Construct new file content.
-	buf := new(bytes.Buffer)
+	buf := new(strings.Builder)
 	licenseT.Execute(buf, info)
 	if m := licenseCommentRE.FindIndex(content); m != nil && m[0] == 0 {
 		buf.Write(content[:m[0]])
diff --git a/core/rawdb/freezer_table.go b/core/rawdb/freezer_table.go
index 4b9d510e82..27c7637768 100644
--- a/core/rawdb/freezer_table.go
+++ b/core/rawdb/freezer_table.go
@@ -17,13 +17,13 @@
 package rawdb
 
 import (
-	"bytes"
 	"encoding/binary"
 	"errors"
 	"fmt"
 	"io"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 	"sync/atomic"
 
@@ -955,7 +955,7 @@ func (t *freezerTable) dumpIndexStdout(start, stop int64) {
 }
 
 func (t *freezerTable) dumpIndexString(start, stop int64) string {
-	var out bytes.Buffer
+	var out strings.Builder
 	out.WriteString("\n")
 	t.dumpIndex(&out, start, stop)
 	return out.String()