diff --git a/congress/api/datasource_model.py b/congress/api/datasource_model.py
index df1dad5e3..59a4aacbc 100644
--- a/congress/api/datasource_model.py
+++ b/congress/api/datasource_model.py
@@ -17,9 +17,9 @@ from __future__ import print_function
 from __future__ import division
 from __future__ import absolute_import
 
-import json
 
 from oslo_log import log as logging
+from oslo_serialization import jsonutils as json
 
 from congress.api import api_utils
 from congress.api import base
diff --git a/congress/api/policy_model.py b/congress/api/policy_model.py
index 00f7fd6ce..7bb9c0b76 100644
--- a/congress/api/policy_model.py
+++ b/congress/api/policy_model.py
@@ -17,9 +17,9 @@ from __future__ import print_function
 from __future__ import division
 from __future__ import absolute_import
 
-import json
 import re
 
+from oslo_serialization import jsonutils as json
 import six
 
 from congress.api import base
diff --git a/congress/api/webservice.py b/congress/api/webservice.py
index e41d4fe63..ef76b81f9 100644
--- a/congress/api/webservice.py
+++ b/congress/api/webservice.py
@@ -22,12 +22,12 @@ try:
     import http.client as httplib
 except ImportError:
     import httplib
-import json
 import re
 
 from oslo_config import cfg
 from oslo_db import exception as db_exc
 from oslo_log import log as logging
+from oslo_serialization import jsonutils as json
 from oslo_utils import uuidutils
 import six
 import webob
diff --git a/congress/server/congress_server.py b/congress/server/congress_server.py
index b0e470698..87d5a1331 100644
--- a/congress/server/congress_server.py
+++ b/congress/server/congress_server.py
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/env python
 #
 # Copyright (c) 2014 VMware, Inc. All rights reserved.
 #
diff --git a/congress_tempest_tests/tests/scenario/congress_datasources/test_murano.py b/congress_tempest_tests/tests/scenario/congress_datasources/test_murano.py
index ea9cfbd2b..25c1d1f4c 100644
--- a/congress_tempest_tests/tests/scenario/congress_datasources/test_murano.py
+++ b/congress_tempest_tests/tests/scenario/congress_datasources/test_murano.py
@@ -61,8 +61,9 @@ class TestMuranoDriver(manager_congress.ScenarioPolicyBase):
                     rule['id'])
 
         def _create_random_policy():
-            policy_name = "murano_%s" % ''.join(random.choice(string.lowercase)
-                                                for x in range(10))
+            policy_name = "murano_%s" % ''.join(
+                random.choice(string.ascii_lowercase)
+                for x in range(10))
             body = {"name": policy_name}
             resp = self.congress_client.create_policy(body)
             self.addCleanup(_delete_policy_rules, resp['name'])
diff --git a/congress_tempest_tests/tests/scenario/congress_ha/test_ha.py b/congress_tempest_tests/tests/scenario/congress_ha/test_ha.py
index 25835ac6f..8e06c3f37 100644
--- a/congress_tempest_tests/tests/scenario/congress_ha/test_ha.py
+++ b/congress_tempest_tests/tests/scenario/congress_ha/test_ha.py
@@ -102,7 +102,7 @@ class TestHA(manager_congress.ScenarioPolicyBase):
     def start_service(self, name, conf_file):
         service = '--' + name
         node = name + '-replica-node'
-        args = ['/usr/bin/python', 'bin/congress-server', service,
+        args = ['bin/congress-server', service,
                 '--node-id', node, '--config-file', conf_file]
 
         p = subprocess.Popen(args, stdout=subprocess.PIPE,
diff --git a/playbooks/legacy/congress-devstack-py35-api-mysql/run.yaml b/playbooks/legacy/congress-devstack-py35-api-mysql/run.yaml
index e7b8d9aa0..53b88b5f0 100644
--- a/playbooks/legacy/congress-devstack-py35-api-mysql/run.yaml
+++ b/playbooks/legacy/congress-devstack-py35-api-mysql/run.yaml
@@ -36,13 +36,11 @@
           disable_service s-proxy
           # without Swift, c-bak cannot run (in the Gate at least)
           disable_service c-bak
-          # disable all plug-ins for now except congress
           # enable_plugin ceilometer git://git.openstack.org/openstack/ceilometer
-          # enable_plugin heat git://git.openstack.org/openstack/heat
-          enable_plugin congress git://git.openstack.org/openstack/congress
-          # enable_plugin murano git://git.openstack.org/openstack/murano
           # enable_plugin aodh git://git.openstack.org/openstack/aodh
-          # enable_plugin designate git://git.openstack.org/openstack/designate
+          enable_plugin heat git://git.openstack.org/openstack/heat
+          enable_plugin congress git://git.openstack.org/openstack/congress
+          enable_plugin murano git://git.openstack.org/openstack/murano
           enable_plugin neutron https://git.openstack.org/openstack/neutron
           # To deploy congress as multi-process (api, pe, datasources)
           CONGRESS_MULTIPROCESS_DEPLOYMENT=True
@@ -81,9 +79,6 @@
           if [ "$BRANCH_OVERRIDE" != "default" ] ; then
               export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE
           fi
-          if [ "mysql" == "postgresql" ] ; then
-              export DEVSTACK_GATE_POSTGRES=1
-          fi
 
           cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
           ./safe-devstack-vm-gate-wrap.sh