diff --git a/go.mod b/go.mod
index 7931cbda..7832cf14 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,6 @@ require (
 	github.com/alecthomas/kingpin/v2 v2.4.0
 	github.com/golang/protobuf v1.5.4
 	github.com/golang/snappy v0.0.4
-	github.com/matttproud/golang_protobuf_extensions v1.0.4
 	github.com/prometheus/client_golang v1.20.4
 	github.com/prometheus/client_model v0.6.1
 	github.com/prometheus/common v0.60.0
diff --git a/go.sum b/go.sum
index 9bb249fb..42e5f60b 100644
--- a/go.sum
+++ b/go.sum
@@ -13,7 +13,6 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
 github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
@@ -32,8 +31,6 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
-github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
-github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
 github.com/mdlayher/socket v0.4.1 h1:eM9y2/jlbs1M615oshPQOHZzj6R6wMT7bX5NPiQvn2U=
 github.com/mdlayher/socket v0.4.1/go.mod h1:cAqeGjoufqdxWkD7DkpyS+wcefOtmu5OQ8KuoJGIReA=
 github.com/mdlayher/vsock v1.2.1 h1:pC1mTJTvjo1r9n9fbm7S1j04rCgCzhCOS5DY0zqHlnQ=
@@ -80,7 +77,6 @@ golang.org/x/net v0.29.0 h1:5ORfpBpCs4HzDYoodCDBbwHzdR5UrLBZ3sOnUJmFoHo=
 golang.org/x/net v0.29.0/go.mod h1:gLkgy8jTGERgjzMic6DS9+SP0ajcu6Xu3Orq/SpETg0=
 golang.org/x/oauth2 v0.23.0 h1:PbgcYx2W7i4LvjJWEbf0ngHV6qJYr86PkAV3bXdLEbs=
 golang.org/x/oauth2 v0.23.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
-golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
 golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
diff --git a/handler/handler_test.go b/handler/handler_test.go
index 5c33a15d..eb9cdbfc 100644
--- a/handler/handler_test.go
+++ b/handler/handler_test.go
@@ -23,10 +23,10 @@ import (
 	"testing"
 	"time"
 
-	"github.com/matttproud/golang_protobuf_extensions/pbutil"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/common/promslog"
 	"github.com/prometheus/common/route"
+	"google.golang.org/protobuf/encoding/protodelim"
 	"google.golang.org/protobuf/encoding/prototext"
 	"google.golang.org/protobuf/proto"
 
@@ -335,7 +335,7 @@ func TestPush(t *testing.T) {
 	// With job name and instance name and protobuf content.
 	mms.lastWriteRequest = storage.WriteRequest{}
 	buf := &bytes.Buffer{}
-	_, err = pbutil.WriteDelimited(buf, &dto.MetricFamily{
+	_, err = protodelim.MarshalTo(buf, &dto.MetricFamily{
 		Name: proto.String("some_metric"),
 		Type: dto.MetricType_UNTYPED.Enum(),
 		Metric: []*dto.Metric{
@@ -350,7 +350,7 @@ func TestPush(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	_, err = pbutil.WriteDelimited(buf, &dto.MetricFamily{
+	_, err = protodelim.MarshalTo(buf, &dto.MetricFamily{
 		Name: proto.String("another_metric"),
 		Type: dto.MetricType_UNTYPED.Enum(),
 		Metric: []*dto.Metric{
@@ -365,7 +365,7 @@ func TestPush(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	_, err = pbutil.WriteDelimited(buf, &dto.MetricFamily{
+	_, err = protodelim.MarshalTo(buf, &dto.MetricFamily{
 		Name: proto.String("histogram_metric"),
 		Type: dto.MetricType_HISTOGRAM.Enum(),
 		Metric: []*dto.Metric{
@@ -518,7 +518,7 @@ func TestPushUTF8(t *testing.T) {
 	// With job name, instance name, UTF-8 escaped label name in params, UTF-8 metric names and protobuf content.
 	mms.lastWriteRequest = storage.WriteRequest{}
 	buf := &bytes.Buffer{}
-	_, err = pbutil.WriteDelimited(buf, &dto.MetricFamily{
+	_, err = protodelim.MarshalTo(buf, &dto.MetricFamily{
 		Name: proto.String("some.metric"),
 		Type: dto.MetricType_UNTYPED.Enum(),
 		Metric: []*dto.Metric{
@@ -533,7 +533,7 @@ func TestPushUTF8(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	_, err = pbutil.WriteDelimited(buf, &dto.MetricFamily{
+	_, err = protodelim.MarshalTo(buf, &dto.MetricFamily{
 		Name: proto.String("another.metric"),
 		Type: dto.MetricType_UNTYPED.Enum(),
 		Metric: []*dto.Metric{
@@ -548,7 +548,7 @@ func TestPushUTF8(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	_, err = pbutil.WriteDelimited(buf, &dto.MetricFamily{
+	_, err = protodelim.MarshalTo(buf, &dto.MetricFamily{
 		Name: proto.String("histogram.metric"),
 		Type: dto.MetricType_HISTOGRAM.Enum(),
 		Metric: []*dto.Metric{
diff --git a/handler/push.go b/handler/push.go
index a9f0defc..45a64b46 100644
--- a/handler/push.go
+++ b/handler/push.go
@@ -14,6 +14,7 @@
 package handler
 
 import (
+	"bufio"
 	"encoding/base64"
 	"fmt"
 	"io"
@@ -23,11 +24,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/matttproud/golang_protobuf_extensions/pbutil"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/expfmt"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/common/route"
+	"google.golang.org/protobuf/encoding/protodelim"
 
 	dto "github.com/prometheus/client_model/go"
 
@@ -89,9 +90,13 @@ func Push(
 			ctParams["encoding"] == "delimited" &&
 			ctParams["proto"] == "io.prometheus.client.MetricFamily" {
 			metricFamilies = map[string]*dto.MetricFamily{}
+			unmarshaler := protodelim.UnmarshalOptions{
+				MaxSize: -1,
+			}
+			in := bufio.NewReader(r.Body)
 			for {
 				mf := &dto.MetricFamily{}
-				if _, err = pbutil.ReadDelimited(r.Body, mf); err != nil {
+				if err = unmarshaler.UnmarshalFrom(in, mf); err != nil {
 					if err == io.EOF {
 						err = nil
 					}