diff --git a/tacker/db/migration/alembic_migrations/versions/6e56d4474b2a_blob_to_json_text.py b/tacker/db/migration/alembic_migrations/versions/6e56d4474b2a_blob_to_json_text.py
new file mode 100644
index 000000000..0916730dd
--- /dev/null
+++ b/tacker/db/migration/alembic_migrations/versions/6e56d4474b2a_blob_to_json_text.py
@@ -0,0 +1,55 @@
+# Copyright 2016 OpenStack Foundation
+#
+#    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.
+#
+
+"""blob-to-json-text
+
+Revision ID: 6e56d4474b2a
+Revises: f958f58e5daa
+Create Date: 2016-06-01 09:50:46.296206
+
+"""
+
+import json
+import pickle
+
+from alembic import op
+import sqlalchemy as sa
+
+from tacker.db import types
+
+# revision identifiers, used by Alembic.
+revision = '6e56d4474b2a'
+down_revision = 'f958f58e5daa'
+
+
+def _migrate_data(table, column_name):
+    meta = sa.MetaData(bind=op.get_bind())
+    t = sa.Table(table, meta, autoload=True)
+
+    for r in t.select().execute():
+        stmt = t.update().where(t.c.id == r.id).values(
+            {column_name: json.dumps(pickle.loads(getattr(r, column_name)))})
+        op.execute(stmt)
+
+    op.alter_column(table,
+                    column_name,
+                    type_=types.Json)
+
+
+def upgrade(active_plugins=None, options=None):
+    _migrate_data('vims', 'placement_attr')
+    _migrate_data('vimauths', 'vim_project')
+    _migrate_data('vimauths', 'auth_cred')
+    _migrate_data('devices', 'placement_attr')
diff --git a/tacker/db/migration/alembic_migrations/versions/HEAD b/tacker/db/migration/alembic_migrations/versions/HEAD
index cab8cc49c..4ebbf0d4a 100644
--- a/tacker/db/migration/alembic_migrations/versions/HEAD
+++ b/tacker/db/migration/alembic_migrations/versions/HEAD
@@ -1 +1 @@
-f958f58e5daa
\ No newline at end of file
+6e56d4474b2a
\ No newline at end of file
diff --git a/tacker/db/nfvo/nfvo_db.py b/tacker/db/nfvo/nfvo_db.py
index 4a34cd4a2..add1f18ef 100644
--- a/tacker/db/nfvo/nfvo_db.py
+++ b/tacker/db/nfvo/nfvo_db.py
@@ -40,7 +40,7 @@ class Vim(model_base.BASE, models_v1.HasId, models_v1.HasTenant):
     type = sa.Column(sa.String(255), nullable=False)
     name = sa.Column(sa.String(255), nullable=True)
     description = sa.Column(sa.String(255), nullable=True)
-    placement_attr = sa.Column(sa.PickleType, nullable=True)
+    placement_attr = sa.Column(types.Json, nullable=True)
     shared = sa.Column(sa.Boolean, default=True, server_default=sql.true(
     ), nullable=False)
     vim_auth = orm.relationship('VimAuth')
@@ -51,8 +51,8 @@ class VimAuth(model_base.BASE, models_v1.HasId):
                        nullable=False)
     password = sa.Column(sa.String(128), nullable=False)
     auth_url = sa.Column(sa.String(255), nullable=False)
-    vim_project = sa.Column(sa.PickleType, nullable=False)
-    auth_cred = sa.Column(sa.PickleType, nullable=False)
+    vim_project = sa.Column(types.Json, nullable=False)
+    auth_cred = sa.Column(types.Json, nullable=False)
     __table_args__ = (sa.UniqueConstraint('auth_url'), {})
 
 
diff --git a/tacker/db/types.py b/tacker/db/types.py
index 30bf6c32c..39f3f9743 100644
--- a/tacker/db/types.py
+++ b/tacker/db/types.py
@@ -12,10 +12,11 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-
+import json
 import uuid
 
 from sqlalchemy.types import String
+from sqlalchemy.types import Text
 from sqlalchemy.types import TypeDecorator
 
 
@@ -34,3 +35,15 @@ class Uuid(TypeDecorator):
 
     def process_result_value(self, value, dialect):
         return value
+
+
+class Json(TypeDecorator):
+    impl = Text
+
+    def process_bind_param(self, value, dialect):
+        return json.dumps(value)
+
+    def process_result_value(self, value, dialect):
+        if value is None:
+            return None
+        return json.loads(value)
diff --git a/tacker/db/vm/vm_db.py b/tacker/db/vm/vm_db.py
index 182ac670c..9c918882d 100644
--- a/tacker/db/vm/vm_db.py
+++ b/tacker/db/vm/vm_db.py
@@ -113,7 +113,7 @@ class Device(model_base.BASE, models_v1.HasId, models_v1.HasTenant):
 
     status = sa.Column(sa.String(255), nullable=False)
     vim_id = sa.Column(types.Uuid, sa.ForeignKey('vims.id'), nullable=False)
-    placement_attr = sa.Column(sa.PickleType, nullable=True)
+    placement_attr = sa.Column(types.Json, nullable=True)
     vim = orm.relationship('Vim')
     error_reason = sa.Column(sa.Text, nullable=True)