diff --git a/discovery/xds/client_test.go b/discovery/xds/client_test.go
index 3a6e319a03..7e3cd85b6c 100644
--- a/discovery/xds/client_test.go
+++ b/discovery/xds/client_test.go
@@ -49,6 +49,8 @@ func urlMustParse(str string) *url.URL {
 }
 
 func TestMakeXDSResourceHttpEndpointEmptyServerURLScheme(t *testing.T) {
+	t.Parallel()
+
 	endpointURL, err := makeXDSResourceHTTPEndpointURL(ProtocolV3, urlMustParse("127.0.0.1"), "monitoring")
 
 	require.Empty(t, endpointURL)
@@ -56,6 +58,8 @@ func TestMakeXDSResourceHttpEndpointEmptyServerURLScheme(t *testing.T) {
 }
 
 func TestMakeXDSResourceHttpEndpointEmptyServerURLHost(t *testing.T) {
+	t.Parallel()
+
 	endpointURL, err := makeXDSResourceHTTPEndpointURL(ProtocolV3, urlMustParse("grpc://127.0.0.1"), "monitoring")
 
 	require.Empty(t, endpointURL)
@@ -63,6 +67,8 @@ func TestMakeXDSResourceHttpEndpointEmptyServerURLHost(t *testing.T) {
 }
 
 func TestMakeXDSResourceHttpEndpoint(t *testing.T) {
+	t.Parallel()
+
 	endpointURL, err := makeXDSResourceHTTPEndpointURL(ProtocolV3, urlMustParse("http://127.0.0.1:5000"), "monitoring")
 
 	require.NoError(t, err)
@@ -70,6 +76,8 @@ func TestMakeXDSResourceHttpEndpoint(t *testing.T) {
 }
 
 func TestCreateNewHTTPResourceClient(t *testing.T) {
+	t.Parallel()
+
 	c := &HTTPResourceClientConfig{
 		HTTPClientConfig: sdConf.HTTPClientConfig,
 		Name:             "test",
@@ -106,6 +114,8 @@ func createTestHTTPResourceClient(t *testing.T, conf *HTTPResourceClientConfig,
 }
 
 func TestHTTPResourceClientFetchEmptyResponse(t *testing.T) {
+	t.Parallel()
+
 	client, cleanup := createTestHTTPResourceClient(t, testHTTPResourceConfig(), ProtocolV3, func(*v3.DiscoveryRequest) (*v3.DiscoveryResponse, error) {
 		return nil, nil
 	})
@@ -117,6 +127,8 @@ func TestHTTPResourceClientFetchEmptyResponse(t *testing.T) {
 }
 
 func TestHTTPResourceClientFetchFullResponse(t *testing.T) {
+	t.Parallel()
+
 	client, cleanup := createTestHTTPResourceClient(t, testHTTPResourceConfig(), ProtocolV3, func(request *v3.DiscoveryRequest) (*v3.DiscoveryResponse, error) {
 		if request.VersionInfo == "1" {
 			return nil, nil
@@ -146,6 +158,8 @@ func TestHTTPResourceClientFetchFullResponse(t *testing.T) {
 }
 
 func TestHTTPResourceClientServerError(t *testing.T) {
+	t.Parallel()
+
 	client, cleanup := createTestHTTPResourceClient(t, testHTTPResourceConfig(), ProtocolV3, func(*v3.DiscoveryRequest) (*v3.DiscoveryResponse, error) {
 		return nil, errors.New("server error")
 	})
diff --git a/discovery/xds/kuma_test.go b/discovery/xds/kuma_test.go
index faf1ab14d2..533a31dcf3 100644
--- a/discovery/xds/kuma_test.go
+++ b/discovery/xds/kuma_test.go
@@ -131,6 +131,8 @@ func newKumaTestHTTPDiscovery(c KumaSDConfig) (*fetchDiscovery, error) {
 }
 
 func TestKumaMadsV1ResourceParserInvalidTypeURL(t *testing.T) {
+	t.Parallel()
+
 	resources := make([]*anypb.Any, 0)
 	groups, err := kumaMadsV1ResourceParser(resources, "type.googleapis.com/some.api.v1.Monitoring")
 	require.Nil(t, groups)
@@ -138,6 +140,8 @@ func TestKumaMadsV1ResourceParserInvalidTypeURL(t *testing.T) {
 }
 
 func TestKumaMadsV1ResourceParserEmptySlice(t *testing.T) {
+	t.Parallel()
+
 	resources := make([]*anypb.Any, 0)
 	groups, err := kumaMadsV1ResourceParser(resources, KumaMadsV1ResourceTypeURL)
 	require.Empty(t, groups)
@@ -145,6 +149,8 @@ func TestKumaMadsV1ResourceParserEmptySlice(t *testing.T) {
 }
 
 func TestKumaMadsV1ResourceParserValidResources(t *testing.T) {
+	t.Parallel()
+
 	res, err := getKumaMadsV1DiscoveryResponse(testKumaMadsV1Resources...)
 	require.NoError(t, err)
 
@@ -192,6 +198,8 @@ func TestKumaMadsV1ResourceParserValidResources(t *testing.T) {
 }
 
 func TestKumaMadsV1ResourceParserInvalidResources(t *testing.T) {
+	t.Parallel()
+
 	data, err := protoJSONMarshalOptions.Marshal(&MonitoringAssignment_Target{})
 	require.NoError(t, err)
 
@@ -206,6 +214,8 @@ func TestKumaMadsV1ResourceParserInvalidResources(t *testing.T) {
 }
 
 func TestNewKumaHTTPDiscovery(t *testing.T) {
+	t.Parallel()
+
 	kd, err := newKumaTestHTTPDiscovery(kumaConf)
 	require.NoError(t, err)
 	require.NotNil(t, kd)
@@ -221,6 +231,8 @@ func TestNewKumaHTTPDiscovery(t *testing.T) {
 }
 
 func TestKumaHTTPDiscoveryRefresh(t *testing.T) {
+	t.Parallel()
+
 	s := createTestHTTPServer(t, func(request *v3.DiscoveryRequest) (*v3.DiscoveryResponse, error) {
 		if request.VersionInfo == "1" {
 			return nil, nil
diff --git a/discovery/xds/xds_test.go b/discovery/xds/xds_test.go
index e1c012e815..5a2e9d737b 100644
--- a/discovery/xds/xds_test.go
+++ b/discovery/xds/xds_test.go
@@ -119,6 +119,8 @@ func (testResourceClient) Close() {
 }
 
 func TestPollingRefreshSkipUpdate(t *testing.T) {
+	t.Parallel()
+
 	rc := &testResourceClient{
 		fetch: func(context.Context) (*v3.DiscoveryResponse, error) {
 			return nil, nil
@@ -162,6 +164,8 @@ func TestPollingRefreshSkipUpdate(t *testing.T) {
 }
 
 func TestPollingRefreshAttachesGroupMetadata(t *testing.T) {
+	t.Parallel()
+
 	server := "http://198.161.2.0"
 	source := "test"
 	rc := &testResourceClient{
@@ -218,6 +222,8 @@ func TestPollingRefreshAttachesGroupMetadata(t *testing.T) {
 }
 
 func TestPollingDisappearingTargets(t *testing.T) {
+	t.Parallel()
+
 	server := "http://198.161.2.0"
 	source := "test"
 	rc := &testResourceClient{