diff --git a/src/apps/datasets/migrations/0007_auto_20230609_1738.py b/src/apps/datasets/migrations/0007_auto_20230609_1738.py
new file mode 100644
index 000000000..f54d966c8
--- /dev/null
+++ b/src/apps/datasets/migrations/0007_auto_20230609_1738.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.2.17 on 2023-06-09 17:38
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('datasets', '0006_auto_20230528_0829'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='data',
+            name='competition',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='submission', to='competitions.Competition'),
+        ),
+    ]
diff --git a/src/apps/datasets/models.py b/src/apps/datasets/models.py
index 3d97e8b45..48d50f3f3 100644
--- a/src/apps/datasets/models.py
+++ b/src/apps/datasets/models.py
@@ -58,7 +58,7 @@ class Data(ChaHubSaveMixin, models.Model):
     # are NOT marked True, since they are not created by unpacking!
     was_created_by_competition = models.BooleanField(default=False)
 
-    competition = models.ForeignKey(Competition, on_delete=models.PROTECT, null=True, related_name='submission')
+    competition = models.ForeignKey(Competition, on_delete=models.CASCADE, null=True, related_name='submission')
     file_name = models.CharField(max_length=64, default="")
 
     def get_download_url(self):