diff --git a/sapl/materia/migrations/0085_auto_20231028_1838.py b/sapl/materia/migrations/0085_auto_20231028_1838.py
new file mode 100644
index 000000000..3531d7b7d
--- /dev/null
+++ b/sapl/materia/migrations/0085_auto_20231028_1838.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.2.28 on 2023-10-28 21:38
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('materia', '0084_auto_20231007_2149'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='numeracao',
+            name='tipo_materia',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='materia.TipoMateriaLegislativa', verbose_name='Tipo de Matéria'),
+        ),
+    ]
diff --git a/sapl/materia/models.py b/sapl/materia/models.py
index 4c4109354..f81758dcc 100644
--- a/sapl/materia/models.py
+++ b/sapl/materia/models.py
@@ -624,7 +624,7 @@ class Numeracao(models.Model):
     materia = models.ForeignKey(MateriaLegislativa, on_delete=models.CASCADE)
     tipo_materia = models.ForeignKey(
         TipoMateriaLegislativa,
-        on_delete=models.PROTECT,
+        on_delete=models.CASCADE,
         verbose_name=_('Tipo de Matéria'))
     numero_materia = models.CharField(max_length=5,
                                       verbose_name=_('Número'))