diff --git a/aleksis/apps/chronos/__init__.py b/aleksis/apps/chronos/__init__.py
index bed63d688b366a2a7a5ea587652167d345823993..482bbcdf18b41d99b02aa17beb45d5560060bee9 100644
--- a/aleksis/apps/chronos/__init__.py
+++ b/aleksis/apps/chronos/__init__.py
@@ -4,5 +4,3 @@ try:
     __version__ = pkg_resources.get_distribution("AlekSIS-App-Chronos").version
 except Exception:
     __version__ = "unknown"
-
-default_app_config = "aleksis.apps.chronos.apps.ChronosConfig"
diff --git a/aleksis/apps/chronos/migrations/0001_initial.py b/aleksis/apps/chronos/migrations/0001_initial.py
index 5d6f1b8f87925290f2319a8ac4805b7526504322..1b1c0ee95b474e02006d6d7c983bc3619176fca7 100644
--- a/aleksis/apps/chronos/migrations/0001_initial.py
+++ b/aleksis/apps/chronos/migrations/0001_initial.py
@@ -26,7 +26,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -35,7 +35,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -56,7 +56,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -65,7 +65,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -87,7 +87,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -96,7 +96,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -126,7 +126,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -135,7 +135,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -165,7 +165,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -174,7 +174,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -202,7 +202,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -211,7 +211,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -258,7 +258,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -267,7 +267,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -312,7 +312,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -321,7 +321,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -400,7 +400,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -409,7 +409,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -465,7 +465,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -474,7 +474,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -507,7 +507,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -516,7 +516,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -676,7 +676,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -685,7 +685,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -717,7 +717,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -726,7 +726,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -808,7 +808,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -817,7 +817,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -878,7 +878,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -887,7 +887,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -995,7 +995,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -1004,7 +1004,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
@@ -1039,7 +1039,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -1048,7 +1048,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),
diff --git a/aleksis/apps/chronos/migrations/0002_school_term_validity.py b/aleksis/apps/chronos/migrations/0002_school_term_validity.py
index f890a222288307a8a7e93942fa43af2950724548..947ccad0a618cc00f2697d17c9d4f8e4d60b0d65 100644
--- a/aleksis/apps/chronos/migrations/0002_school_term_validity.py
+++ b/aleksis/apps/chronos/migrations/0002_school_term_validity.py
@@ -53,7 +53,7 @@ class Migration(migrations.Migration):
             fields=[
                 (
                     "id",
-                    models.AutoField(
+                    models.BigAutoField(
                         auto_created=True,
                         primary_key=True,
                         serialize=False,
@@ -62,7 +62,7 @@ class Migration(migrations.Migration):
                 ),
                 (
                     "extended_data",
-                    django.contrib.postgres.fields.jsonb.JSONField(
+                    models.JSONField(
                         default=dict, editable=False
                     ),
                 ),