diff --git a/images/kube-webhook-certgen/rootfs/pkg/certs/certs_test.go b/images/kube-webhook-certgen/rootfs/pkg/certs/certs_test.go
index b4d95b9b2..fa8383cbb 100644
--- a/images/kube-webhook-certgen/rootfs/pkg/certs/certs_test.go
+++ b/images/kube-webhook-certgen/rootfs/pkg/certs/certs_test.go
@@ -5,7 +5,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -49,7 +49,7 @@ func TestCertificateCreation(t *testing.T) {
 		t.Errorf("Response code was %v; want 200", res.StatusCode)
 	}
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		t.Fatal(err)
 	}