diff --git a/congress/datasources/json_ingester/exec_api.py b/congress/datasources/json_ingester/exec_api.py
index 55342a86f..0d71fc9cb 100644
--- a/congress/datasources/json_ingester/exec_api.py
+++ b/congress/datasources/json_ingester/exec_api.py
@@ -24,10 +24,10 @@ from oslo_concurrency import lockutils
 from oslo_config import cfg
 from oslo_log import log as logging
 import psycopg2
-from psycopg2 import sql
 import requests
 
 from congress.datasources import datasource_utils
+from congress.datasources.json_ingester import sql
 from congress import exception
 
 
diff --git a/congress/datasources/json_ingester/json_ingester.py b/congress/datasources/json_ingester/json_ingester.py
index c8bd3297d..38baf20cd 100644
--- a/congress/datasources/json_ingester/json_ingester.py
+++ b/congress/datasources/json_ingester/json_ingester.py
@@ -25,12 +25,12 @@ from jsonpath_rw import parser
 from oslo_config import cfg
 from oslo_log import log as logging
 import psycopg2
-from psycopg2 import sql
 import requests
 
 from congress.api import base as api_base
 from congress.datasources import datasource_driver
 from congress.datasources import datasource_utils
+from congress.datasources.json_ingester import sql
 from congress.dse2 import data_service
 from congress import exception
 
diff --git a/congress/datasources/json_ingester/sql.py b/congress/datasources/json_ingester/sql.py
new file mode 100644
index 000000000..6ad39a741
--- /dev/null
+++ b/congress/datasources/json_ingester/sql.py
@@ -0,0 +1,36 @@
+# Copyright (c) 2019 VMware, Inc. All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+'''
+This module provides a minimal implementation psycopg2.sql features used by
+Congress. The purpose is to avoid requiring psycopg2>=2.7 which is not
+available in CentOS 7.
+'''
+from __future__ import print_function
+from __future__ import division
+from __future__ import absolute_import
+
+import re
+
+
+def SQL(input_statement):
+    return input_statement
+
+
+def Identifier(identifier):
+    '''Validate and return quoted SQL identifier.'''
+    if re.search('^[a-zA-Z_][a-zA-Z0-9_]*$', identifier):
+        return '"' + identifier + '"'
+    else:
+        raise Exception('Unacceptable SQL identifier: {}'.format(identifier))
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 06f710cf0..192329c0c 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -84,7 +84,7 @@ pika-pool==0.1.3
 pika==0.10.0
 ply==3.11
 prettytable==0.7.2
-psycopg2==2.7
+psycopg2==2.5.1
 PuLP==1.4.1
 pycadf==2.7.0
 pycparser==2.18
diff --git a/requirements.txt b/requirements.txt
index c10cfe381..21bf087d0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
-jsonschema<3.0.0,>=2.6.0 # MIT
+jsonschema>=2.6.0 # MIT
 PuLP>=1.4.1 # MIT
 keystoneauth1>=3.4.0 # Apache-2.0
 keystonemiddleware>=4.17.0 # Apache-2.0
@@ -26,7 +26,7 @@ alembic>=0.8.10 # MIT
 cryptography>=2.1 # BSD/Apache-2.0
 netaddr>=0.7.18 # BSD
 jsonpath-rw<2.0,>=1.2.0 # Apache-2.0
-psycopg2>=2.7 # LGPL/ZPL
+psycopg2>=2.5.1 # LGPL/ZPL
 python-dateutil>=2.5.3 # BSD
 python-glanceclient>=2.8.0 # Apache-2.0
 requests>=2.14.2,!=2.20.0 # Apache-2.0