diff --git a/cmd/ssl/main.go b/cmd/ssl/main.go
index f4a00a1..8cdbedc 100644
--- a/cmd/ssl/main.go
+++ b/cmd/ssl/main.go
@@ -48,7 +48,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"time"
 
 	MQTT "github.com/eclipse/paho.mqtt.golang"
@@ -59,7 +59,7 @@ func NewTLSConfig() *tls.Config {
 	// Alternatively, manually add CA certificates to
 	// default openssl CA bundle.
 	certpool := x509.NewCertPool()
-	pemCerts, err := ioutil.ReadFile("samplecerts/CAfile.pem")
+	pemCerts, err := os.ReadFile("samplecerts/CAfile.pem")
 	if err == nil {
 		certpool.AppendCertsFromPEM(pemCerts)
 	}
diff --git a/filestore.go b/filestore.go
index fcfaa12..42d1eea 100644
--- a/filestore.go
+++ b/filestore.go
@@ -19,7 +19,6 @@
 package mqtt
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"sort"
@@ -166,7 +165,7 @@ func (store *FileStore) all() []string {
 		return nil
 	}
 
-	files, err = ioutil.ReadDir(store.directory)
+	files, err = os.ReadDir(store.directory)
 	chkerr(err)
 	sort.Sort(files)
 	for _, f := range files {