diff --git a/api.go b/api.go
index 864256c..59f4ecb 100644
--- a/api.go
+++ b/api.go
@@ -3,7 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 
 	"github.com/julienschmidt/httprouter"
@@ -24,7 +24,7 @@ func webRegisterPost(w http.ResponseWriter, r *http.Request, _ httprouter.Params
 	var reg []byte
 	var err error
 	aTXT := ACMETxt{}
-	bdata, _ := ioutil.ReadAll(r.Body)
+	bdata, _ := io.ReadAll(r.Body)
 	if len(bdata) > 0 {
 		err = json.Unmarshal(bdata, &aTXT)
 		if err != nil {
diff --git a/main_test.go b/main_test.go
index 66f4d6e..c223e25 100644
--- a/main_test.go
+++ b/main_test.go
@@ -3,12 +3,13 @@ package main
 import (
 	"flag"
 	"fmt"
-	log "github.com/sirupsen/logrus"
-	logrustest "github.com/sirupsen/logrus/hooks/test"
-	"io/ioutil"
+	"io"
 	"os"
 	"sync"
 	"testing"
+
+	log "github.com/sirupsen/logrus"
+	logrustest "github.com/sirupsen/logrus/hooks/test"
 )
 
 var loghook = new(logrustest.Hook)
@@ -96,7 +97,7 @@ func setupConfig() {
 }
 
 func setupTestLogger() {
-	log.SetOutput(ioutil.Discard)
+	log.SetOutput(io.Discard)
 	log.AddHook(loghook)
 }
 
diff --git a/util_test.go b/util_test.go
index 1eb4b67..7be43e3 100644
--- a/util_test.go
+++ b/util_test.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"syscall"
 	"testing"
@@ -51,7 +50,7 @@ func TestReadConfig(t *testing.T) {
 			DNSConfig{},
 		},
 	} {
-		tmpfile, err := ioutil.TempFile("", "acmedns")
+		tmpfile, err := os.CreateTemp("", "acmedns")
 		if err != nil {
 			t.Error("Could not create temporary file")
 		}
@@ -99,7 +98,7 @@ func TestGetIPListFromHeader(t *testing.T) {
 }
 
 func TestFileCheckPermissionDenied(t *testing.T) {
-	tmpfile, err := ioutil.TempFile("", "acmedns")
+	tmpfile, err := os.CreateTemp("", "acmedns")
 	if err != nil {
 		t.Error("Could not create temporary file")
 	}
@@ -118,7 +117,7 @@ func TestFileCheckNotExists(t *testing.T) {
 }
 
 func TestFileCheckOK(t *testing.T) {
-	tmpfile, err := ioutil.TempFile("", "acmedns")
+	tmpfile, err := os.CreateTemp("", "acmedns")
 	if err != nil {
 		t.Error("Could not create temporary file")
 	}