diff --git a/codec/noop.go b/codec/noop.go
index ad3564e6..2975c1f2 100644
--- a/codec/noop.go
+++ b/codec/noop.go
@@ -3,7 +3,6 @@ package codec
 import (
 	"encoding/json"
 	"io"
-	"io/ioutil"
 )
 
 type noopCodec struct {
@@ -20,7 +19,7 @@ func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error
 
 func (c *noopCodec) ReadBody(conn io.Reader, b interface{}) error {
 	// read bytes
-	buf, err := ioutil.ReadAll(conn)
+	buf, err := io.ReadAll(conn)
 	if err != nil {
 		return err
 	}
diff --git a/go.mod b/go.mod
index f8a91073..6ddf07b5 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/unistack-org/micro/v3
 
-go 1.14
+go 1.16
 
 require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
diff --git a/resolver/http/http.go b/resolver/http/http.go
index 01543131..0b862a2e 100644
--- a/resolver/http/http.go
+++ b/resolver/http/http.go
@@ -4,7 +4,7 @@ package http
 import (
 	"encoding/json"
 	"errors"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 
@@ -61,7 +61,7 @@ func (r *HTTPResolver) Resolve(name string) ([]*resolver.Record, error) {
 	if rsp.StatusCode != 200 {
 		return nil, errors.New("non 200 response")
 	}
-	b, err := ioutil.ReadAll(rsp.Body)
+	b, err := io.ReadAll(rsp.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/util/http/http_test.go b/util/http/http_test.go
index dc322bc7..941978b5 100644
--- a/util/http/http_test.go
+++ b/util/http/http_test.go
@@ -3,7 +3,6 @@
 package http
 
 import (
-	"io/ioutil"
 	"net"
 	"net/http"
 	"testing"
@@ -52,7 +51,7 @@ func TestRoundTripper(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	b, err := ioutil.ReadAll(w.Body)
+	b, err := io.ReadAll(w.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -72,7 +71,7 @@ func TestRoundTripper(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	b, err = ioutil.ReadAll(rsp.Body)
+	b, err = io.ReadAll(rsp.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/util/token/jwt/jwt_test.go b/util/token/jwt/jwt_test.go
index 3de492ef..85f14080 100644
--- a/util/token/jwt/jwt_test.go
+++ b/util/token/jwt/jwt_test.go
@@ -1,7 +1,7 @@
 package jwt
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 	"time"
 
@@ -10,7 +10,7 @@ import (
 )
 
 func TestGenerate(t *testing.T) {
-	privKey, err := ioutil.ReadFile("test/sample_key")
+	privKey, err := os.ReadFile("test/sample_key")
 	if err != nil {
 		t.Fatalf("Unable to read private key: %v", err)
 	}
@@ -26,11 +26,11 @@ func TestGenerate(t *testing.T) {
 }
 
 func TestInspect(t *testing.T) {
-	pubKey, err := ioutil.ReadFile("test/sample_key.pub")
+	pubKey, err := os.ReadFile("test/sample_key.pub")
 	if err != nil {
 		t.Fatalf("Unable to read public key: %v", err)
 	}
-	privKey, err := ioutil.ReadFile("test/sample_key")
+	privKey, err := os.ReadFile("test/sample_key")
 	if err != nil {
 		t.Fatalf("Unable to read private key: %v", err)
 	}