diff --git a/app/migrations/0052_alter_mountainrange_select_300.py b/app/migrations/0052_alter_mountainrange_select_300.py
new file mode 100644
index 0000000..b6d0365
--- /dev/null
+++ b/app/migrations/0052_alter_mountainrange_select_300.py
@@ -0,0 +1,18 @@
+# Generated by Django 4.0.1 on 2022-01-13 04:08
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('app', '0051_auto_20220104_1608'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='mountainrange',
+            name='select_300',
+            field=models.BooleanField(blank=True, max_length=12, null=True),
+        ),
+    ]
diff --git a/app/models.py b/app/models.py
index 4980def..ebbd17f 100644
--- a/app/models.py
+++ b/app/models.py
@@ -119,7 +119,7 @@ class MountainRange(models.Model):
     gmba_v2_id_str = models.TextField(blank=True, null=True)
     wiki_data_id = models.CharField(blank=True, null=True, max_length=25)
     wiki_data_url = models.TextField(blank=True, null=True)
-    select_300 = models.CharField(blank=True, null=True, max_length=12)
+    select_300 = models.BooleanField(blank=True, null=True, max_length=12)
     gmba_narrow = models.CharField(blank=True, null=True, max_length=12)
     name_fr = models.CharField(blank=True, null=True, max_length=128)
     name_de = models.CharField(blank=True, null=True, max_length=128)