diff --git a/vendor/k8s.io/apimachinery/pkg/runtime/serializer/protobuf/protobuf.go b/vendor/k8s.io/apimachinery/pkg/runtime/serializer/protobuf/protobuf.go
index b99ba25..8af889d 100644
--- a/vendor/k8s.io/apimachinery/pkg/runtime/serializer/protobuf/protobuf.go
+++ b/vendor/k8s.io/apimachinery/pkg/runtime/serializer/protobuf/protobuf.go
@@ -69,22 +69,18 @@
 // NewSerializer creates a Protobuf serializer that handles encoding versioned objects into the proper wire form. If a typer
 // is passed, the encoded object will have group, version, and kind fields set. If typer is nil, the objects will be written
 // as-is (any type info passed with the object will be used).
-//
-// This encoding scheme is experimental, and is subject to change at any time.
-func NewSerializer(creater runtime.ObjectCreater, typer runtime.ObjectTyper, defaultContentType string) *Serializer {
+func NewSerializer(creater runtime.ObjectCreater, typer runtime.ObjectTyper) *Serializer {
 	return &Serializer{
-		prefix:      protoEncodingPrefix,
-		creater:     creater,
-		typer:       typer,
-		contentType: defaultContentType,
+		prefix:  protoEncodingPrefix,
+		creater: creater,
+		typer:   typer,
 	}
 }
 
 type Serializer struct {
-	prefix      []byte
-	creater     runtime.ObjectCreater
-	typer       runtime.ObjectTyper
-	contentType string
+	prefix  []byte
+	creater runtime.ObjectCreater
+	typer   runtime.ObjectTyper
 }
 
 var _ runtime.Serializer = &Serializer{}
@@ -138,7 +134,7 @@
 	if intoUnknown, ok := into.(*runtime.Unknown); ok && intoUnknown != nil {
 		*intoUnknown = unk
 		if ok, _, _ := s.RecognizesData(bytes.NewBuffer(unk.Raw)); ok {
-			intoUnknown.ContentType = s.contentType
+			intoUnknown.ContentType = runtime.ContentTypeProtobuf
 		}
 		return intoUnknown, &actual, nil
 	}
@@ -303,20 +299,18 @@
 // encoded object, and thus is not self describing (callers must know what type is being described in order to decode).
 //
 // This encoding scheme is experimental, and is subject to change at any time.
-func NewRawSerializer(creater runtime.ObjectCreater, typer runtime.ObjectTyper, defaultContentType string) *RawSerializer {
+func NewRawSerializer(creater runtime.ObjectCreater, typer runtime.ObjectTyper) *RawSerializer {
 	return &RawSerializer{
-		creater:     creater,
-		typer:       typer,
-		contentType: defaultContentType,
+		creater: creater,
+		typer:   typer,
 	}
 }
 
 // RawSerializer encodes and decodes objects without adding a runtime.Unknown wrapper (objects are encoded without identifying
 // type).
 type RawSerializer struct {
-	creater     runtime.ObjectCreater
-	typer       runtime.ObjectTyper
-	contentType string
+	creater runtime.ObjectCreater
+	typer   runtime.ObjectTyper
 }
 
 var _ runtime.Serializer = &RawSerializer{}
@@ -358,7 +352,7 @@
 	if intoUnknown, ok := into.(*runtime.Unknown); ok && intoUnknown != nil {
 		intoUnknown.Raw = data
 		intoUnknown.ContentEncoding = ""
-		intoUnknown.ContentType = s.contentType
+		intoUnknown.ContentType = runtime.ContentTypeProtobuf
 		intoUnknown.SetGroupVersionKind(*actual)
 		return intoUnknown, actual, nil
 	}
@@ -411,6 +405,9 @@
 	if err := proto.Unmarshal(data, pb); err != nil {
 		return nil, actual, err
 	}
+	if actual != nil {
+		obj.GetObjectKind().SetGroupVersionKind(*actual)
+	}
 	return obj, actual, nil
 }