diff --git a/api/sshhost_test.go b/api/sshhost_test.go
index 5cab4158..e85aa63e 100644
--- a/api/sshhost_test.go
+++ b/api/sshhost_test.go
@@ -9,9 +9,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/golang/protobuf/ptypes/empty"
 	"github.com/theparanoids/crypki/config"
 	"github.com/theparanoids/crypki/proto"
+	"google.golang.org/protobuf/types/known/emptypb"
 )
 
 func TestGetHostSSHCertificateAvailableSigningKeys(t *testing.T) {
@@ -53,7 +53,7 @@ func TestGetHostSSHCertificateAvailableSigningKeys(t *testing.T) {
 			mssp := mockSigningServiceParam{KeyUsages: tt.KeyUsages, sendError: false}
 			ss := initMockSigningService(mssp)
 			var ctx context.Context
-			var e *empty.Empty
+			var e *emptypb.Empty
 			keyMetas, err := ss.GetHostSSHCertificateAvailableSigningKeys(ctx, e)
 			if err != nil {
 				t.Fatal(err)
diff --git a/go.mod b/go.mod
index 20945e02..883947cf 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,6 @@ go 1.16
 
 require (
 	github.com/golang/mock v1.5.0
-	github.com/golang/protobuf v1.5.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.4.0
 	github.com/miekg/pkcs11 v1.0.3