diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 3b245634..9690a181 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.1.2
+current_version = 0.1.3
 
 [bumpversion:file:setup.cfg]
 
diff --git a/aquarius/app/assets.py b/aquarius/app/assets.py
index c065215a..a0b9bdfc 100644
--- a/aquarius/app/assets.py
+++ b/aquarius/app/assets.py
@@ -4,7 +4,7 @@
 from datetime import datetime
 
 import pytz
-from flask import Blueprint, jsonify, request
+from flask import Blueprint, request
 from oceandb_driver_interface.search_model import QueryModel, FullTextModel
 
 from aquarius.app.dao import Dao
@@ -34,7 +34,7 @@ def get_assets():
     asset_with_id = dao.get_assets()
     asset_ids = [a['id'] for a in asset_with_id]
     resp_body = dict({'ids': asset_ids})
-    return jsonify(resp_body), 200
+    return _sanitize_record(resp_body), 200
 
 
 @assets.route('/ddo/<id>', methods=['GET'])
@@ -57,7 +57,7 @@ def get_ddo(id):
     """
     try:
         asset_record = dao.get(id)
-        return jsonify(asset_record), 200
+        return _sanitize_record(asset_record), 200
     except Exception as e:
         logging.error(e)
         return '"%s asset_id is not in OceanDB' % id, 404
@@ -89,7 +89,7 @@ def get_metadata(id):
             i = i + 1
             if service['type'] == 'Metadata':
                 metadata = asset_record['service'][i]
-        return jsonify(metadata), 200
+        return _sanitize_record(metadata), 200
     except Exception as e:
         logging.error(e)
         return '"%s asset_id is not in OceanDB' % id, 404
@@ -441,7 +441,9 @@ def get_asset_ddos():
     args.append(query)
     assets_with_id = dao.get_assets()
     assets_metadata = {a['id']: a for a in assets_with_id}
-    return jsonify(json.dumps(assets_metadata)), 200
+    for i in assets_metadata:
+        _sanitize_record(i)
+    return json.dumps(assets_metadata), 200
 
 
 @assets.route('/ddo/query', methods=['GET'])
@@ -482,9 +484,10 @@ def query_text():
                                  offset=int(data.get('offset', 100)),
                                  page=int(data.get('page', 0)))
     query_result = dao.query(search_model)
+
     for i in query_result:
         _sanitize_record(i)
-    return jsonify(json.dumps(query_result)), 200
+    return json.dumps(query_result), 200
 
 
 @assets.route('/ddo/query', methods=['POST'])
@@ -537,7 +540,7 @@ def query_ddo():
     query_result = dao.query(search_model)
     for i in query_result:
         _sanitize_record(i)
-    return jsonify(json.dumps(query_result)), 200
+    return json.dumps(query_result), 200
 
 
 def _sanitize_record(data_record):
diff --git a/setup.cfg b/setup.cfg
index 71c8599b..8865b15a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.1.2
+current_version = 0.1.3
 commit = True
 tag = True
 
diff --git a/setup.py b/setup.py
index 6f27ef31..e09f796a 100644
--- a/setup.py
+++ b/setup.py
@@ -74,6 +74,6 @@
     test_suite='tests',
     tests_require=test_requirements,
     url='https://github.com/oceanprotocol/aquarius',
-    version='0.1.2',
+    version='0.1.3',
     zip_safe=False,
 )
diff --git a/tests/test_api.py b/tests/test_api.py
index df9e436f..fb780630 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -83,14 +83,14 @@ def test_query_metadata(client):
                         content_type='application/json')
     assert len(json.loads(client.post(BaseURLs.BASE_AQUARIUS_URL + '/assets/ddo/query',
                                       data=json.dumps({"query": {}}),
-                                      content_type='application/json').json)) == 2
+                                      content_type='application/json').data.decode('utf-8'))) == 2
     assert len(json.loads(client.post(BaseURLs.BASE_AQUARIUS_URL + '/assets/ddo/query',
                                       data=json.dumps({"query": {"id": "did:op:123456789abcdefghi"}}),
-                                      content_type='application/json').json)) == 1
+                                      content_type='application/json').data.decode('utf-8'))) == 1
     assert len(json.loads(client.get(BaseURLs.BASE_AQUARIUS_URL + '/assets/ddo/query?text=Office',
-                                     ).json)) == 2
+                                     ).data.decode('utf-8'))) == 2
     assert len(json.loads(client.get(BaseURLs.BASE_AQUARIUS_URL + '/assets/ddo/query?text=112233445566778899',
-                                     ).json)) == 1
+                                     ).data.decode('utf-8'))) == 1
     client.delete(BaseURLs.BASE_AQUARIUS_URL + '/assets/ddo/%s' % json.loads(post.data.decode('utf-8'))['id'])
     client.delete(
         BaseURLs.BASE_AQUARIUS_URL + '/assets/ddo/%s' % json.loads(post2.data.decode('utf-8'))['id'])