diff --git a/.gitignore b/.gitignore
index 6c51732e..e5e81393 100644
--- a/.gitignore
+++ b/.gitignore
@@ -60,3 +60,6 @@ test.txt.tmp
 
 # Pycharm
 .idea/
+
+# VSCode
+.vscode
diff --git a/submissions/__init__.py b/submissions/__init__.py
index 4885af09..7ed47d37 100644
--- a/submissions/__init__.py
+++ b/submissions/__init__.py
@@ -1,2 +1,2 @@
 """ API for creating submissions and scores. """
-__version__ = '3.4.0'
+__version__ = '3.4.1'
diff --git a/submissions/migrations/0002_team_submission_optional.py b/submissions/migrations/0002_team_submission_optional.py
new file mode 100644
index 00000000..af91822a
--- /dev/null
+++ b/submissions/migrations/0002_team_submission_optional.py
@@ -0,0 +1,25 @@
+# Generated by Django 3.2.9 on 2021-11-10 22:08
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submissions', '0001_squashed_0005_CreateTeamModel'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='submission',
+            name='team_submission',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='submissions',
+                to='submissions.teamsubmission',
+            ),
+        ),
+    ]
diff --git a/submissions/models.py b/submissions/models.py
index 0e1fc540..aad20954 100644
--- a/submissions/models.py
+++ b/submissions/models.py
@@ -332,6 +332,7 @@ class Submission(models.Model):
         TeamSubmission,
         related_name='submissions',
         null=True,
+        blank=True,
         db_index=True,
         on_delete=models.SET_NULL
     )