diff --git a/bijoe/db_utils.py b/bijoe/db_utils.py
new file mode 100644
index 0000000..95746ad
--- /dev/null
+++ b/bijoe/db_utils.py
@@ -0,0 +1,49 @@
+# bijoe - BI dashboard
+# Copyright (C) 2015-2022  Entr'ouvert
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from django.db import connection
+from django.db.migrations.operations.base import Operation
+
+
+class EnsureJsonbType(Operation):
+
+    reversible = True
+
+    def __init__(self, model_name, field_name):
+        self.model_name = model_name
+        self.field_name = field_name
+
+    def state_forwards(self, app_label, state):
+        pass
+
+    def database_forwards(self, app_label, schema_editor, from_state, to_state):
+        if connection.vendor == 'postgresql':
+            model = from_state.apps.get_model(app_label, self.model_name)
+            table_name = model._meta.db_table
+            field = model._meta.get_field(self.field_name)
+            _, column_name = field.get_attname_column()
+            with schema_editor.connection.cursor() as cursor:
+                cursor.execute(
+                    'ALTER TABLE {table} ALTER COLUMN {col} TYPE jsonb USING {col}::jsonb;'.format(
+                        table=table_name, col=column_name
+                    )
+                )
+
+    def database_backwards(self, app_label, schema_editor, from_state, to_state):
+        pass
+
+    def describe(self):
+        return "Migrate to postgres jsonb type"
diff --git a/bijoe/visualization/migrations/0005_text_to_jsonb.py b/bijoe/visualization/migrations/0005_text_to_jsonb.py
new file mode 100644
index 0000000..4f52954
--- /dev/null
+++ b/bijoe/visualization/migrations/0005_text_to_jsonb.py
@@ -0,0 +1,16 @@
+# Generated by Django 2.2.28 on 2022-05-15 06:26
+
+from django.db import migrations
+
+from bijoe.db_utils import EnsureJsonbType
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('visualization', '0004_auto_20190328_0825'),
+    ]
+
+    operations = [
+        EnsureJsonbType(model_name='Visualization', field_name='parameters'),
+    ]