diff --git a/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/BUILD b/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/BUILD
index 2fe6dbeb8f1..8f0fe68bcb4 100644
--- a/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/BUILD
+++ b/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/BUILD
@@ -23,7 +23,6 @@ go_library(
         "//vendor/k8s.io/kube-openapi/pkg/util/proto:go_default_library",
         "//vendor/sigs.k8s.io/structured-merge-diff/fieldpath:go_default_library",
         "//vendor/sigs.k8s.io/structured-merge-diff/merge:go_default_library",
-        "//vendor/sigs.k8s.io/structured-merge-diff/schema:go_default_library",
         "//vendor/sigs.k8s.io/structured-merge-diff/typed:go_default_library",
         "//vendor/sigs.k8s.io/structured-merge-diff/value:go_default_library",
         "//vendor/sigs.k8s.io/yaml:go_default_library",
diff --git a/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/gvkparser.go b/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/gvkparser.go
index 1028a81b101..929f1e79a7b 100644
--- a/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/gvkparser.go
+++ b/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/gvkparser.go
@@ -22,7 +22,6 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/kube-openapi/pkg/schemaconv"
 	"k8s.io/kube-openapi/pkg/util/proto"
-	smdschema "sigs.k8s.io/structured-merge-diff/schema"
 	"sigs.k8s.io/structured-merge-diff/typed"
 )
 
@@ -49,7 +48,6 @@ func newGVKParser(models proto.Models) (*gvkParser, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed to convert models to schema: %v", err)
 	}
-	typeSchema = makeRawExtensionUntyped(typeSchema)
 	parser := gvkParser{
 		gvks: map[schema.GroupVersionKind]string{},
 	}
@@ -120,20 +118,3 @@ func parseGroupVersionKind(s proto.Schema) []schema.GroupVersionKind {
 
 	return gvkListResult
 }
-
-// makeRawExtensionUntyped explicitly sets RawExtension's type in the schema to Untyped atomic
-// TODO: remove this once kube-openapi is updated to include
-// https://github.com/kubernetes/kube-openapi/pull/133
-func makeRawExtensionUntyped(s *smdschema.Schema) *smdschema.Schema {
-	s2 := &smdschema.Schema{}
-	for _, t := range s.Types {
-		t2 := t
-		if t2.Name == "io.k8s.apimachinery.pkg.runtime.RawExtension" {
-			t2.Atom = smdschema.Atom{
-				Untyped: &smdschema.Untyped{},
-			}
-		}
-		s2.Types = append(s2.Types, t2)
-	}
-	return s2
-}