diff --git a/cvat/apps/engine/migrations/0023_auto_20200113_1323.py b/cvat/apps/engine/migrations/0023_auto_20200113_1323.py
new file mode 100644
index 000000000000..4089eb1a1a66
--- /dev/null
+++ b/cvat/apps/engine/migrations/0023_auto_20200113_1323.py
@@ -0,0 +1,34 @@
+# Generated by Django 2.2.8 on 2020-01-13 13:23
+
+import cvat.apps.engine.models
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('engine', '0022_auto_20191004_0817'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='labeledimageattributeval',
+            name='value',
+            field=cvat.apps.engine.models.SafeCharField(max_length=4096),
+        ),
+        migrations.AlterField(
+            model_name='labeledshapeattributeval',
+            name='value',
+            field=cvat.apps.engine.models.SafeCharField(max_length=4096),
+        ),
+        migrations.AlterField(
+            model_name='labeledtrackattributeval',
+            name='value',
+            field=cvat.apps.engine.models.SafeCharField(max_length=4096),
+        ),
+        migrations.AlterField(
+            model_name='trackedshapeattributeval',
+            name='value',
+            field=cvat.apps.engine.models.SafeCharField(max_length=4096),
+        ),
+    ]
diff --git a/cvat/apps/engine/models.py b/cvat/apps/engine/models.py
index 8b6f63d8480f..d27867957afa 100644
--- a/cvat/apps/engine/models.py
+++ b/cvat/apps/engine/models.py
@@ -238,7 +238,7 @@ class AttributeVal(models.Model):
     # TODO: add a validator here to be sure that it corresponds to self.label
     id = models.BigAutoField(primary_key=True)
     spec = models.ForeignKey(AttributeSpec, on_delete=models.CASCADE)
-    value = SafeCharField(max_length=64)
+    value = SafeCharField(max_length=4096)
 
     class Meta:
         abstract = True