diff --git a/go.mod b/go.mod
index 62bc45c..65733a3 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module go.unistack.org/micro-client-http/v4
 
 go 1.19
 
-require go.unistack.org/micro/v4 v4.0.6
+require go.unistack.org/micro/v4 v4.0.18
diff --git a/go.sum b/go.sum
index 979a288..03a7fae 100644
--- a/go.sum
+++ b/go.sum
@@ -2,3 +2,5 @@ go.unistack.org/micro/v4 v4.0.1 h1:xo1IxbVfgh8i0eY0VeYa3cbb13u5n/Mxnp3FOgWD4Jo=
 go.unistack.org/micro/v4 v4.0.1/go.mod h1:p/J5UcSJjfHsWGT31uKoghQ5rUQZzQJBAFy+Z4+ZVMs=
 go.unistack.org/micro/v4 v4.0.6 h1:YFWvTh3VwyOd6NHYTQcf47n2TF5+p/EhpnbuBQX3qhk=
 go.unistack.org/micro/v4 v4.0.6/go.mod h1:bVEYTlPi0EsdgZZt311bIroDg9ict7ky3C87dSCCAGk=
+go.unistack.org/micro/v4 v4.0.18 h1:b7WFwem8Nz1xBrRg5FeLnm9CE5gJseHyf9j0BhkiXW0=
+go.unistack.org/micro/v4 v4.0.18/go.mod h1:5+da5r835gP0WnNZbYUJDCvWpJ9Xc3IEGyp62e8o8R4=
diff --git a/http.go b/http.go
index b5f2ebf..bb83d6c 100644
--- a/http.go
+++ b/http.go
@@ -139,7 +139,7 @@ func newRequest(ctx context.Context, log logger.Logger, addr string, req client.
 	if opts.Context != nil {
 		if md, ok := opts.Context.Value(metadataKey{}).(metadata.Metadata); ok {
 			for k, v := range md {
-				header.Set(k, v)
+				header[k] = v
 			}
 		}
 	}
@@ -148,13 +148,13 @@ func newRequest(ctx context.Context, log logger.Logger, addr string, req client.
 	}
 	if opts.RequestMetadata != nil {
 		for k, v := range opts.RequestMetadata {
-			header.Set(k, v)
+			header[k] = v
 		}
 	}
 
 	if md, ok := metadata.FromOutgoingContext(ctx); ok {
 		for k, v := range md {
-			header.Set(k, v)
+			header[k] = v
 		}
 	}
 
@@ -216,7 +216,7 @@ func newRequest(ctx context.Context, log logger.Logger, addr string, req client.
 	}
 
 	if log.V(logger.DebugLevel) {
-		log.Debugf(ctx, "request %s to %s with headers %v body %s", method, u.String(), hreq.Header, b)
+		log.Debug(ctx, fmt.Sprintf("request %s to %s with headers %v body %s", method, u.String(), hreq.Header, b))
 	}
 
 	return hreq, nil
diff --git a/stream.go b/stream.go
index fbd0d8c..2a69b89 100644
--- a/stream.go
+++ b/stream.go
@@ -134,14 +134,14 @@ func (h *httpStream) parseRsp(ctx context.Context, log logger.Logger, hrsp *http
 			buf, err = io.ReadAll(hrsp.Body)
 			if err != nil {
 				if log.V(logger.ErrorLevel) {
-					log.Errorf(ctx, "failed to read body: %v", err)
+					log.Error(ctx, "failed to read body", err)
 				}
 				return errors.InternalServerError("go.micro.client", string(buf))
 			}
 		}
 
 		if log.V(logger.DebugLevel) {
-			log.Debugf(ctx, "response %s with %v", buf, hrsp.Header)
+			log.Debug(ctx, fmt.Sprintf("response %s with %v", buf, hrsp.Header))
 		}
 
 		if hrsp.StatusCode < 400 {
diff --git a/util.go b/util.go
index 0a59021..4d4edd7 100644
--- a/util.go
+++ b/util.go
@@ -274,7 +274,7 @@ func (h *httpClient) parseRsp(ctx context.Context, hrsp *http.Response, rsp inte
 			buf, err = io.ReadAll(hrsp.Body)
 			if err != nil {
 				if h.opts.Logger.V(logger.ErrorLevel) {
-					h.opts.Logger.Errorf(ctx, "failed to read body: %v", err)
+					h.opts.Logger.Error(ctx, "failed to read body", err)
 				}
 				return errors.InternalServerError("go.micro.client", string(buf))
 			}
@@ -283,13 +283,13 @@ func (h *httpClient) parseRsp(ctx context.Context, hrsp *http.Response, rsp inte
 		cf, cerr := h.newCodec(ct)
 		if cerr != nil {
 			if h.opts.Logger.V(logger.DebugLevel) {
-				h.opts.Logger.Debugf(ctx, "response with %v unknown content-type %s %s", hrsp.Header, ct, buf)
+				h.opts.Logger.Debug(ctx, fmt.Sprintf("response with %v unknown content-type %s %s", hrsp.Header, ct, buf))
 			}
 			return errors.InternalServerError("go.micro.client", cerr.Error())
 		}
 
 		if h.opts.Logger.V(logger.DebugLevel) {
-			h.opts.Logger.Debugf(ctx, "response %s with %v", buf, hrsp.Header)
+			h.opts.Logger.Debug(ctx, fmt.Sprintf("response %s with %v", buf, hrsp.Header))
 		}
 
 		// succeseful response