diff --git a/mistral/db/sqlalchemy/migration/alembic_migrations/versions/021_increase_env_columns_size.py b/mistral/db/sqlalchemy/migration/alembic_migrations/versions/021_increase_env_columns_size.py
new file mode 100644
index 000000000..52a8a6e09
--- /dev/null
+++ b/mistral/db/sqlalchemy/migration/alembic_migrations/versions/021_increase_env_columns_size.py
@@ -0,0 +1,35 @@
+# Copyright 2015 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.
+
+"""Increase environments_v2 column size from JsonDictType to JsonLongDictType
+
+Revision ID: 021
+Revises: 020
+Create Date: 2017-06-13 13:29:41.636094
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '021'
+down_revision = '020'
+
+from alembic import op
+from mistral.db.sqlalchemy import types as st
+
+
+def upgrade():
+    # Changing column types from JsonDictType to JsonLongDictType
+    op.alter_column('environments_v2', 'variables',
+                    type_=st.JsonLongDictType())
diff --git a/mistral/db/v2/sqlalchemy/models.py b/mistral/db/v2/sqlalchemy/models.py
index 323a53b07..ea91435e3 100644
--- a/mistral/db/v2/sqlalchemy/models.py
+++ b/mistral/db/v2/sqlalchemy/models.py
@@ -367,7 +367,7 @@ class Environment(mb.MistralSecureModelBase):
     id = mb.id_column()
     name = sa.Column(sa.String(200))
     description = sa.Column(sa.Text())
-    variables = sa.Column(st.JsonDictType())
+    variables = sa.Column(st.JsonLongDictType())
 
 
 class CronTrigger(mb.MistralSecureModelBase):