diff --git a/metrics/label.go b/metrics/label.go
index 56af8ced0c..0147627a2a 100644
--- a/metrics/label.go
+++ b/metrics/label.go
@@ -47,7 +47,5 @@ func (l *Label) Snapshot() *LabelSnapshot {
 func (l *Label) Mark(value map[string]interface{}) {
 	l.mutex.Lock()
 	defer l.mutex.Unlock()
-	for k, v := range value {
-		l.value[k] = v
-	}
+	maps.Copy(l.value, value)
 }
diff --git a/rpc/client_opt.go b/rpc/client_opt.go
index 3fa045a9b9..4079b51942 100644
--- a/rpc/client_opt.go
+++ b/rpc/client_opt.go
@@ -17,6 +17,7 @@
 package rpc
 
 import (
+	"maps"
 	"net/http"
 
 	"github.com/gorilla/websocket"
@@ -89,9 +90,7 @@ func WithHeader(key, value string) ClientOption {
 func WithHeaders(headers http.Header) ClientOption {
 	return optionFunc(func(cfg *clientConfig) {
 		cfg.initHeaders()
-		for k, vs := range headers {
-			cfg.httpHeaders[k] = vs
-		}
+		maps.Copy(cfg.httpHeaders, headers)
 	})
 }
 
diff --git a/rpc/http.go b/rpc/http.go
index 59fcc9141a..f8602a61a5 100644
--- a/rpc/http.go
+++ b/rpc/http.go
@@ -23,6 +23,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"maps"
 	"math"
 	"mime"
 	"net/http"
@@ -147,9 +148,7 @@ func newClientTransportHTTP(endpoint string, cfg *clientConfig) reconnectFunc {
 	headers := make(http.Header, 2+len(cfg.httpHeaders))
 	headers.Set("accept", contentType)
 	headers.Set("content-type", contentType)
-	for key, values := range cfg.httpHeaders {
-		headers[key] = values
-	}
+	maps.Copy(headers, cfg.httpHeaders)
 
 	client := cfg.httpClient
 	if client == nil {
diff --git a/rpc/websocket.go b/rpc/websocket.go
index e211b4d7b9..ccf496317f 100644
--- a/rpc/websocket.go
+++ b/rpc/websocket.go
@@ -20,6 +20,7 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
+	"maps"
 	"net/http"
 	"net/url"
 	"os"
@@ -240,9 +241,7 @@ func newClientTransportWS(endpoint string, cfg *clientConfig) (reconnectFunc, er
 	if err != nil {
 		return nil, err
 	}
-	for key, values := range cfg.httpHeaders {
-		header[key] = values
-	}
+	maps.Copy(header, cfg.httpHeaders)
 
 	connect := func(ctx context.Context) (ServerCodec, error) {
 		header := header.Clone()