diff --git a/bijoe/visualization/migrations/0006_auto_20220515_0920.py b/bijoe/visualization/migrations/0006_auto_20220515_0920.py
new file mode 100644
index 0000000..9ee01f6
--- /dev/null
+++ b/bijoe/visualization/migrations/0006_auto_20220515_0920.py
@@ -0,0 +1,21 @@
+# Generated by Django 2.2.28 on 2022-05-15 07:20
+
+import django.contrib.postgres.fields.jsonb
+from django.db import migrations, models
+
+import bijoe.visualization.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('visualization', '0005_text_to_jsonb'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='visualization',
+            name='slug',
+            field=models.SlugField(max_length=200, unique=True, verbose_name='Identifier'),
+        ),
+    ]
diff --git a/bijoe/visualization/models.py b/bijoe/visualization/models.py
index 87fd304..1341171 100644
--- a/bijoe/visualization/models.py
+++ b/bijoe/visualization/models.py
@@ -39,7 +39,7 @@ class JSONEncoder(json.JSONEncoder):
 
 
 class Visualization(models.Model):
-    slug = models.SlugField(verbose_name=_('Identifier'), unique=True)
+    slug = models.SlugField(verbose_name=_('Identifier'), unique=True, max_length=200)
     name = models.TextField(verbose_name=_('name'))
     parameters = JSONField(verbose_name=_('parameters'), encoder_class=JSONEncoder)