diff --git a/networking_powervm/plugins/ibm/agent/powervm/sea_agent.py b/networking_powervm/plugins/ibm/agent/powervm/sea_agent.py
index e528bcb..489749e 100644
--- a/networking_powervm/plugins/ibm/agent/powervm/sea_agent.py
+++ b/networking_powervm/plugins/ibm/agent/powervm/sea_agent.py
@@ -197,7 +197,7 @@ class SharedEthernetNeutronAgent(agent_base.BasePVMNeutronAgent):
             # To determine the ones no longer needed, subtract from all the
             # VLANs the ones that are no longer needed.
             vlans_to_del = existing_vlans - req_vlans
-            for vlan_to_del in vlans_to_del:
+            for vlan_to_del in sorted(vlans_to_del):
                 if cur_delete < 3:
                     LOG.warning("Cleaning up VLAN %s from the system. It is "
                                 "no longer in use.", vlan_to_del)
diff --git a/networking_powervm/tests/unit/plugins/ibm/powervm/test_sea_agent.py b/networking_powervm/tests/unit/plugins/ibm/powervm/test_sea_agent.py
index 6ecb86d..fe5307a 100644
--- a/networking_powervm/tests/unit/plugins/ibm/powervm/test_sea_agent.py
+++ b/networking_powervm/tests/unit/plugins/ibm/powervm/test_sea_agent.py
@@ -159,11 +159,7 @@ class SEAAgentTest(base.BasePVMTestCase):
         # Mock a provision request
         mock_get_nb_and_vlan.return_value = ('nb2_uuid', 23)
 
-        # Mock up network bridges.  VLANs 44, 45, and 46 should be deleted
-        # as they are not required by anything.  VLAN 47 should be needed
-        # as it is in the pending list.  VLAN 48 should be deleted, but will
-        # put over the three delete max count (and therefore would be hit in
-        # next pass)
+        # Mock up network bridges.
         mock_nb1 = fake_nb('nb_uuid', 20, [], [])
         mock_nb2 = fake_nb('nb2_uuid', 40, [41, 42, 43], [44, 45, 46, 47, 48])
         mock_list_bridges.return_value = [mock_nb1, mock_nb2]
@@ -190,27 +186,44 @@ class SEAAgentTest(base.BasePVMTestCase):
                        mock_vs_map.return_value) for cna in (cna1, cna2)],
             any_order=True)
 
-        # One remove call per net bridge.
+        # One remove call per net bridge, up to a max of 3.
+        self.assertEqual(3, mock_nbr_remove.call_count)
+        # VLANs 44, 45, 46, 47, and 48 are not required by anything, so the
+        # first three of those should be deleted
         mock_nbr_remove.assert_has_calls(
             [mock.call(
                 self.agent.adapter, self.agent.host_uuid, 'nb2_uuid', vlan)
-             for vlan in (44, 45, 48)], any_order=True)
+             for vlan in (44, 45, 46)], any_order=True)
+        # Update mocks to show 44, 45, and 46 were removed
+        mock_nb2 = fake_nb('nb2_uuid', 40, [41, 42, 43], [47, 48])
+        mock_list_bridges.return_value = [mock_nb1, mock_nb2]
+        mock_find_nb_for_cna.return_value = mock_nb2
 
-        # Validate no remove.
+        # Validate no removes if we disable cleanup.
         mock_nbr_remove.reset_mock()
         mock_prov_devs.reset_mock()
-        # Set that we can't do the clean up
         cfg.CONF.set_override('automated_powervm_vlan_cleanup', False,
                               group='AGENT')
-
         # Invoke
         self.agent.heal_and_optimize()
-
         # Verify.  One ensure call per net bridge.  Zero for the remove as that
         # has been flagged to not clean up.
         mock_nbr_remove.assert_not_called()
         mock_prov_devs.assert_called_with([preq1, preq2, preq3])
 
+        # Now change the CONF back and validate we can remove the remainder
+        cfg.CONF.set_override('automated_powervm_vlan_cleanup', True,
+                              group='AGENT')
+        # Invoke
+        self.agent.heal_and_optimize()
+        # Should only be two left to remove
+        self.assertEqual(2, mock_nbr_remove.call_count)
+        # VLANs 47, and 48 should be the ones that are removed
+        mock_nbr_remove.assert_has_calls(
+            [mock.call(
+                self.agent.adapter, self.agent.host_uuid, 'nb2_uuid', vlan)
+             for vlan in (47, 48)], any_order=True)
+
     def test_get_nb_and_vlan(self):
         """Be sure nb uuid and vlan parsed from dev properly."""
         self.assertEqual(('nb_uuid', 100), self.agent._get_nb_and_vlan(
diff --git a/setup.cfg b/setup.cfg
index 6206ad9..e8177fd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -15,7 +15,7 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
 
 [entry_points]
 console_scripts =
diff --git a/tox.ini b/tox.ini
index c329cca..0a9c252 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py35,py27,pep8
+envlist = py36,py27,pep8
 minversion = 3.1.1
 skipsdist = True
 # Automatic envs (pyXX) will use the python version appropriate to that
@@ -31,14 +31,24 @@ commands =
   find . -type f -name "*.pyc" -delete
 
 [testenv:py27]
-basepython = python2.7
 commands =
   {[testenv]commands}
   stestr run {posargs}
   stestr slowest
 
 [testenv:py35]
-basepython = python3.5
+commands =
+  {[testenv]commands}
+  stestr run {posargs}
+  stestr slowest
+
+[testenv:py36]
+commands =
+  {[testenv]commands}
+  stestr run {posargs}
+  stestr slowest
+
+[testenv:py37]
 commands =
   {[testenv]commands}
   stestr run {posargs}