diff --git a/x509_cert/x509_cert.go b/x509_cert/x509_cert.go
index 6b3578a..18b9c36 100644
--- a/x509_cert/x509_cert.go
+++ b/x509_cert/x509_cert.go
@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"github.com/lestrrat-go/jwx/v2/cert"
-	"golang.org/x/crypto/sha3"
 	"regexp"
 	"strings"
 )
@@ -40,7 +39,7 @@ func Hash(data []byte, alg string) ([]byte, error) {
 		sum := sha256.Sum256(data)
 		return sum[:], nil
 	case "sha384":
-		sum := sha3.Sum384(data)
+		sum := sha512.Sum384(data)
 		return sum[:], nil
 	case "sha512":
 		sum := sha512.Sum512(data)
diff --git a/x509_cert/x509_cert_test.go b/x509_cert/x509_cert_test.go
index 4f24a19..ca33e45 100644
--- a/x509_cert/x509_cert_test.go
+++ b/x509_cert/x509_cert_test.go
@@ -9,7 +9,6 @@ import (
 	"encoding/pem"
 	"fmt"
 	"github.com/stretchr/testify/assert"
-	"golang.org/x/crypto/sha3"
 	"strings"
 	"testing"
 )
@@ -17,7 +16,7 @@ import (
 func TestHash(t *testing.T) {
 	sha1sum := sha1.Sum([]byte("test"))
 	sha256sum := sha256.Sum256([]byte("test"))
-	sha384sum := sha3.Sum384([]byte("test"))
+	sha384sum := sha512.Sum384([]byte("test"))
 	sha512sum := sha512.Sum512([]byte("test"))
 	testCases := []struct {
 		name  string