diff --git a/nailgun/nailgun/fixtures/openstack.yaml b/nailgun/nailgun/fixtures/openstack.yaml
index fae5e94c63..ab020a9b0c 100644
--- a/nailgun/nailgun/fixtures/openstack.yaml
+++ b/nailgun/nailgun/fixtures/openstack.yaml
@@ -1219,6 +1219,10 @@
                 name: "mos-updates"
                 uri: "http://mirror.fuel-infra.org/mos/centos-6/mos6.1/updates"
                 priority: null
+              - type: "rpm"
+                name: "mos-security"
+                uri: "http://mirror.fuel-infra.org/mos/centos-6/mos6.1/security"
+                priority: null
               - type: "rpm"
                 name: "Auxiliary"
                 uri: "http://{settings.MASTER_IP}:8080/{cluster.release.version}/centos/auxiliary"
diff --git a/nailgun/nailgun/test/integration/test_attributes.py b/nailgun/nailgun/test/integration/test_attributes.py
index 0cf2681fd8..7d08311bf1 100644
--- a/nailgun/nailgun/test/integration/test_attributes.py
+++ b/nailgun/nailgun/test/integration/test_attributes.py
@@ -467,6 +467,13 @@ class TestAlwaysEditable(BaseIntegrationTest):
                        'updates',
                 'priority': None,
             },
+            {
+                'type': 'rpm',
+                'name': 'mos-security',
+                'uri': 'http://mirror.fuel-infra.org/mos/centos-6/mos6.1/'
+                       'security',
+                'priority': None,
+            },
             {
                 'type': 'rpm',
                 'name': 'Auxiliary',
diff --git a/nailgun/nailgun/test/unit/test_stages_task_serialization.py b/nailgun/nailgun/test/unit/test_stages_task_serialization.py
index 3bdd874227..b25e2d544d 100644
--- a/nailgun/nailgun/test/unit/test_stages_task_serialization.py
+++ b/nailgun/nailgun/test/unit/test_stages_task_serialization.py
@@ -139,13 +139,14 @@ class TestHooksSerializers(BaseTaskSerializationTest):
         task = tasks_serializer.UploadMOSRepo(
             task_config, self.cluster, self.nodes)
         serialized = list(task.serialize())
-        self.assertEqual(len(serialized), 4)
+        self.assertEqual(len(serialized), 5)
         self.assertEqual(serialized[0]['type'], 'upload_file')
         self.assertEqual(serialized[1]['type'], 'upload_file')
         self.assertEqual(serialized[2]['type'], 'upload_file')
-        self.assertEqual(serialized[3]['type'], 'shell')
-        self.assertEqual(serialized[3]['parameters']['cmd'], 'yum clean all')
-        self.assertItemsEqual(serialized[3]['uids'], self.all_uids)
+        self.assertEqual(serialized[3]['type'], 'upload_file')
+        self.assertEqual(serialized[4]['type'], 'shell')
+        self.assertEqual(serialized[4]['parameters']['cmd'], 'yum clean all')
+        self.assertItemsEqual(serialized[4]['uids'], self.all_uids)
 
     def test_serialize_rados_with_ceph(self):
         task_config = {'id': 'restart_radosgw',