diff --git a/apps/participation/migrations/0001_initial.py b/apps/participation/migrations/0001_initial.py
index 3618606..f1eea8d 100644
--- a/apps/participation/migrations/0001_initial.py
+++ b/apps/participation/migrations/0001_initial.py
@@ -17,7 +17,7 @@ class Migration(migrations.Migration):
             name='Participation',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('problem', models.IntegerField(choices=[(1, 'Problem #1'), (2, 'Problem #2'), (3, 'Problem #3'), (4, 'Problem #4')], default=None, null=True, verbose_name='problem number')),
+                ('problem', models.IntegerField(choices=[(1, 'Problem #1'), (2, 'Problem #2'), (3, 'Problem #3')], default=None, null=True, verbose_name='problem number')),
             ],
             options={
                 'verbose_name': 'participation',
diff --git a/apps/participation/models.py b/apps/participation/models.py
index 322fb9a..f968b91 100644
--- a/apps/participation/models.py
+++ b/apps/participation/models.py
@@ -116,7 +116,7 @@ class Participation(models.Model):
     )
 
     problem = models.IntegerField(
-        choices=[(i, format_lazy(_("Problem #{problem:d}"), problem=i)) for i in range(1, 5)],
+        choices=[(i, format_lazy(_("Problem #{problem:d}"), problem=i)) for i in range(1, 4)],
         null=True,
         default=None,
         verbose_name=_("problem number"),