diff --git a/internal/codegenerator/parse_req.go b/internal/codegenerator/parse_req.go
index ca92d8e..4083e1b 100644
--- a/internal/codegenerator/parse_req.go
+++ b/internal/codegenerator/parse_req.go
@@ -3,7 +3,6 @@ package codegenerator
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/pluginpb"
@@ -11,7 +10,7 @@ import (
 
 // ParseRequest parses a code generator request from a proto Message.
 func ParseRequest(r io.Reader) (*pluginpb.CodeGeneratorRequest, error) {
-	input, err := ioutil.ReadAll(r)
+	input, err := io.ReadAll(r)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read code generator request: %v", err)
 	}
diff --git a/internal/descriptor/grpc_api_configuration.go b/internal/descriptor/grpc_api_configuration.go
index a3ae3b8..5227417 100644
--- a/internal/descriptor/grpc_api_configuration.go
+++ b/internal/descriptor/grpc_api_configuration.go
@@ -3,7 +3,7 @@ package descriptor
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/grpc-ecosystem/grpc-gateway/v2/internal/descriptor/apiconfig"
@@ -64,7 +64,7 @@ func registerHTTPRulesFromGrpcAPIService(registry *Registry, service *apiconfig.
 // Note that for the purposes of the gateway generator we only consider a subset of all
 // available features google supports in their service descriptions.
 func (r *Registry) LoadGrpcAPIServiceFromYAML(yamlFile string) error {
-	yamlFileContents, err := ioutil.ReadFile(yamlFile)
+	yamlFileContents, err := os.ReadFile(yamlFile)
 	if err != nil {
 		return fmt.Errorf("failed to read gRPC API Configuration description from '%v': %v", yamlFile, err)
 	}
diff --git a/internal/descriptor/openapi_configuration.go b/internal/descriptor/openapi_configuration.go
index 3487c06..0ce8ae1 100644
--- a/internal/descriptor/openapi_configuration.go
+++ b/internal/descriptor/openapi_configuration.go
@@ -3,7 +3,7 @@ package descriptor
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/grpc-ecosystem/grpc-gateway/v2/internal/descriptor/openapiconfig"
 	"google.golang.org/protobuf/encoding/protojson"
@@ -51,7 +51,7 @@ func registerOpenAPIOptions(registry *Registry, openAPIConfig *openapiconfig.Ope
 // and registers the OpenAPI options the given registry.
 // This must be done after loading the proto file.
 func (r *Registry) LoadOpenAPIConfigFromYAML(yamlFile string) error {
-	yamlFileContents, err := ioutil.ReadFile(yamlFile)
+	yamlFileContents, err := os.ReadFile(yamlFile)
 	if err != nil {
 		return fmt.Errorf("failed to read OpenAPI Configuration description from '%v': %v", yamlFile, err)
 	}
diff --git a/protoc-gen-openapiv2/internal/genopenapi/template.go b/protoc-gen-openapiv2/internal/genopenapi/template.go
index fc4cf85..66a2de8 100644
--- a/protoc-gen-openapiv2/internal/genopenapi/template.go
+++ b/protoc-gen-openapiv2/internal/genopenapi/template.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math"
 	"net/textproto"
 	"os"
@@ -2188,7 +2187,7 @@ func goTemplateComments(comment string, data interface{}, reg *descriptor.Regist
 	tpl, err := template.New("").Funcs(template.FuncMap{
 		// Allows importing documentation from a file
 		"import": func(name string) string {
-			file, err := ioutil.ReadFile(name)
+			file, err := os.ReadFile(name)
 			if err != nil {
 				return err.Error()
 			}
diff --git a/runtime/handler_test.go b/runtime/handler_test.go
index 3755cd3..9062972 100644
--- a/runtime/handler_test.go
+++ b/runtime/handler_test.go
@@ -3,7 +3,6 @@ package runtime_test
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -104,7 +103,7 @@ func TestForwardResponseStream(t *testing.T) {
 			if h := w.Header.Get("Transfer-Encoding"); h != "chunked" {
 				t.Errorf("ForwardResponseStream missing header chunked")
 			}
-			body, err := ioutil.ReadAll(w.Body)
+			body, err := io.ReadAll(w.Body)
 			if err != nil {
 				t.Errorf("Failed to read response body with %v", err)
 			}
@@ -238,7 +237,7 @@ func TestForwardResponseStreamCustomMarshaler(t *testing.T) {
 			if h := w.Header.Get("Transfer-Encoding"); h != "chunked" {
 				t.Errorf("ForwardResponseStream missing header chunked")
 			}
-			body, err := ioutil.ReadAll(w.Body)
+			body, err := io.ReadAll(w.Body)
 			if err != nil {
 				t.Errorf("Failed to read response body with %v", err)
 			}
@@ -302,7 +301,7 @@ func TestForwardResponseMessage(t *testing.T) {
 			if h := w.Header.Get("Content-Type"); h != tt.contentType {
 				t.Errorf("Content-Type %v want %v", h, tt.contentType)
 			}
-			body, err := ioutil.ReadAll(w.Body)
+			body, err := io.ReadAll(w.Body)
 			if err != nil {
 				t.Errorf("Failed to read response body with %v", err)
 			}
diff --git a/runtime/marshal_proto.go b/runtime/marshal_proto.go
index 007f8f1..00904cf 100644
--- a/runtime/marshal_proto.go
+++ b/runtime/marshal_proto.go
@@ -4,7 +4,6 @@ import (
 	"io"
 
 	"errors"
-	"io/ioutil"
 
 	"google.golang.org/protobuf/proto"
 )
@@ -38,7 +37,7 @@ func (*ProtoMarshaller) Unmarshal(data []byte, value interface{}) error {
 // NewDecoder returns a Decoder which reads proto stream from "reader".
 func (marshaller *ProtoMarshaller) NewDecoder(reader io.Reader) Decoder {
 	return DecoderFunc(func(value interface{}) error {
-		buffer, err := ioutil.ReadAll(reader)
+		buffer, err := io.ReadAll(reader)
 		if err != nil {
 			return err
 		}
diff --git a/utilities/readerfactory.go b/utilities/readerfactory.go
index 6dd3854..01d26ed 100644
--- a/utilities/readerfactory.go
+++ b/utilities/readerfactory.go
@@ -3,13 +3,12 @@ package utilities
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 )
 
 // IOReaderFactory takes in an io.Reader and returns a function that will allow you to create a new reader that begins
 // at the start of the stream
 func IOReaderFactory(r io.Reader) (func() io.Reader, error) {
-	b, err := ioutil.ReadAll(r)
+	b, err := io.ReadAll(r)
 	if err != nil {
 		return nil, err
 	}