diff --git a/Pipfile b/Pipfile
index a6ca945a..1a30f2e3 100644
--- a/Pipfile
+++ b/Pipfile
@@ -19,7 +19,7 @@ requests-mock = "*"
 watchdog = {extras = ["watchmedo"], version = "*"}
 
 [packages]
-djangorestframework = "~=3.9"
+djangorestframework = "~=3.14.0"
 django-environ = "~=0.4"
 django-model-utils = "~=4.0"
 sentry-sdk = "~=1.17.0"
@@ -30,9 +30,8 @@ requests = "~=2.31"
 unidecode = "~=1.2"
 django-log-formatter-ecs = "==0.0.5"
 gunicorn = "*"
-django = "==3.2.23"
+django = "~=4.2.8"
 elastic-apm = "==6.7.2"
-django-jsonfield = "==1.4"
 msal = "~=1.22.0"
 psycopg2-binary = "~=2.9.3"
 setuptools = "~=65.5.1"
diff --git a/Pipfile.lock b/Pipfile.lock
index caa52f8e..22628b5f 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "676dd01f9d7f01b4e1a1a2735334f2e65705880df342f68b33bc2d1a4ccaaaf2"
+            "sha256": "f385428bcfb1f71e1f4cfed303bd22384979b5f4eeb4bc0015a2be7566efd65c"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -34,9 +34,6 @@
             "version": "==3.7.2"
         },
         "backports.zoneinfo": {
-            "extras": [
-                "tzdata"
-            ],
             "hashes": [
                 "sha256:17746bd546106fa389c51dbea67c8b7c8f0d14b5526a579ca6ccf5ed72c526cf",
                 "sha256:1b13e654a55cd45672cb54ed12148cd33628f672548f373963b0bff67b217328",
@@ -315,12 +312,12 @@
         },
         "django": {
             "hashes": [
-                "sha256:82968f3640e29ef4a773af2c28448f5f7a08d001c6ac05b32d02aeee6509508b",
-                "sha256:d48608d5f62f2c1e260986835db089fa3b79d6f58510881d316b8d88345ae6e1"
+                "sha256:12498cc3cb8bc8038539fef9e90e95f507502436c1f0c3a673411324fa675d14",
+                "sha256:2cc2fc7d1708ada170ddd6c99f35cc25db664f165d3794bc7723f46b2f8c8984"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
-            "version": "==3.2.23"
+            "markers": "python_version >= '3.8'",
+            "version": "==4.2.9"
         },
         "django-environ": {
             "hashes": [
@@ -348,14 +345,6 @@
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'",
             "version": "==3.0.7"
         },
-        "django-jsonfield": {
-            "hashes": [
-                "sha256:7bdd0ea75ad842b9e33decdf343398c91fbb7bd664fde0648ef83e78b0453b6e",
-                "sha256:9b3dac9f7352a6d37e9cfe0126c5b58ac7abf1cb20c0da294a00269a725223f1"
-            ],
-            "index": "pypi",
-            "version": "==1.4.0"
-        },
         "django-log-formatter-ecs": {
             "hashes": [
                 "sha256:1e8731dd25a11ac64e789f19931e12fe7ef8ad1a172b7bceb2ea5cab185a583e",
@@ -710,11 +699,11 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:55901e917a5896a349ff771be919f8bd99aff50b79fe58fec595eb37bbc56bb3",
-                "sha256:df7aa8afb0148fa78488e7899b2c59b5f4ffcfa82e6c54ccb9dd37c1d7b52d54"
+                "sha256:051d961ad0c62a94e50ecf1af379c3aba230c66c710493493560c0c223c49f20",
+                "sha256:ce3711610ddce217e6d113a2732fafad960a03fd0318c91faa79481e35c11224"
             ],
             "markers": "python_version >= '3.8'",
-            "version": "==2.1.0"
+            "version": "==2.2.0"
         },
         "vine": {
             "hashes": [
@@ -847,6 +836,28 @@
             ],
             "version": "==0.2.0"
         },
+        "backports.zoneinfo": {
+            "hashes": [
+                "sha256:17746bd546106fa389c51dbea67c8b7c8f0d14b5526a579ca6ccf5ed72c526cf",
+                "sha256:1b13e654a55cd45672cb54ed12148cd33628f672548f373963b0bff67b217328",
+                "sha256:1c5742112073a563c81f786e77514969acb58649bcdf6cdf0b4ed31a348d4546",
+                "sha256:4a0f800587060bf8880f954dbef70de6c11bbe59c673c3d818921f042f9954a6",
+                "sha256:5c144945a7752ca544b4b78c8c41544cdfaf9786f25fe5ffb10e838e19a27570",
+                "sha256:7b0a64cda4145548fed9efc10322770f929b944ce5cee6c0dfe0c87bf4c0c8c9",
+                "sha256:8439c030a11780786a2002261569bdf362264f605dfa4d65090b64b05c9f79a7",
+                "sha256:8961c0f32cd0336fb8e8ead11a1f8cd99ec07145ec2931122faaac1c8f7fd987",
+                "sha256:89a48c0d158a3cc3f654da4c2de1ceba85263fafb861b98b59040a5086259722",
+                "sha256:a76b38c52400b762e48131494ba26be363491ac4f9a04c1b7e92483d169f6582",
+                "sha256:da6013fd84a690242c310d77ddb8441a559e9cb3d3d59ebac9aca1a57b2e18bc",
+                "sha256:e55b384612d93be96506932a786bbcde5a2db7a9e6a4bb4bffe8b733f5b9036b",
+                "sha256:e81b76cace8eda1fca50e345242ba977f9be6ae3945af8d46326d776b4cf78d1",
+                "sha256:e8236383a20872c0cdf5a62b554b27538db7fa1bbec52429d8d106effbaeca08",
+                "sha256:f04e857b59d9d1ccc39ce2da1021d196e47234873820cbeaad210724b1ee28ac",
+                "sha256:fadbfe37f74051d024037f223b8e001611eac868b5c5b06144ef4d8b799862f2"
+            ],
+            "markers": "python_version < '3.9'",
+            "version": "==0.2.1"
+        },
         "bandit": {
             "hashes": [
                 "sha256:2ff3fe35fe3212c0be5fc9c4899bd0108e2b5239c5ff62fb174639e4660fe958",
@@ -998,9 +1009,6 @@
             "version": "==8.1.7"
         },
         "coverage": {
-            "extras": [
-                "toml"
-            ],
             "hashes": [
                 "sha256:004d1880bed2d97151facef49f08e255a20ceb6f9432df75f4eef018fdd5a78c",
                 "sha256:01d84219b5cdbfc8122223b39a954820929497a1cb1422824bb86b07b74594b6",
@@ -1069,12 +1077,12 @@
         },
         "django": {
             "hashes": [
-                "sha256:82968f3640e29ef4a773af2c28448f5f7a08d001c6ac05b32d02aeee6509508b",
-                "sha256:d48608d5f62f2c1e260986835db089fa3b79d6f58510881d316b8d88345ae6e1"
+                "sha256:12498cc3cb8bc8038539fef9e90e95f507502436c1f0c3a673411324fa675d14",
+                "sha256:2cc2fc7d1708ada170ddd6c99f35cc25db664f165d3794bc7723f46b2f8c8984"
             ],
             "index": "pypi",
-            "markers": "python_version >= '3.6'",
-            "version": "==3.2.23"
+            "markers": "python_version >= '3.8'",
+            "version": "==4.2.9"
         },
         "django-extensions": {
             "hashes": [
@@ -1425,13 +1433,6 @@
             "markers": "python_version >= '3.8'",
             "version": "==4.8.0"
         },
-        "pytz": {
-            "hashes": [
-                "sha256:31d4583c4ed539cd037956140d695e42c033a19e984bfce9964a3f7d59bc2b40",
-                "sha256:f90ef520d95e7c46951105338d918664ebfd6f1d995bd7d153127ce90efafa6a"
-            ],
-            "version": "==2023.4"
-        },
         "pyyaml": {
             "hashes": [
                 "sha256:04ac92ad1925b2cff1db0cfebffb6ffc43457495c9b3c39d3fcae417d7125dc5",
@@ -1610,11 +1611,11 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:55901e917a5896a349ff771be919f8bd99aff50b79fe58fec595eb37bbc56bb3",
-                "sha256:df7aa8afb0148fa78488e7899b2c59b5f4ffcfa82e6c54ccb9dd37c1d7b52d54"
+                "sha256:051d961ad0c62a94e50ecf1af379c3aba230c66c710493493560c0c223c49f20",
+                "sha256:ce3711610ddce217e6d113a2732fafad960a03fd0318c91faa79481e35c11224"
             ],
             "markers": "python_version >= '3.8'",
-            "version": "==2.1.0"
+            "version": "==2.2.0"
         },
         "watchdog": {
             "extras": [
diff --git a/conf/settings.py b/conf/settings.py
index 9234ede2..6cd7dfa2 100644
--- a/conf/settings.py
+++ b/conf/settings.py
@@ -24,7 +24,7 @@
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = env.bool("DEBUG", default=False)
 
-ALLOWED_HOSTS = "*"
+ALLOWED_HOSTS = ["*"]
 
 # Application definition
 
diff --git a/mail/migrations/0001_initial.py b/mail/migrations/0001_initial.py
index fb65e36f..33787e6c 100644
--- a/mail/migrations/0001_initial.py
+++ b/mail/migrations/0001_initial.py
@@ -4,7 +4,6 @@
 
 import django.db.models.deletion
 import django.utils.timezone
-import jsonfield.fields
 from django.db import migrations, models
 
 
@@ -85,20 +84,20 @@ class Migration(migrations.Migration):
             name="UsageUpdate",
             fields=[
                 ("id", models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
-                ("licence_ids", jsonfield.fields.JSONField(default=dict)),
+                ("licence_ids", models.JSONField(default=dict)),
                 ("spire_run_number", models.IntegerField()),
                 ("hmrc_run_number", models.IntegerField()),
-                ("has_lite_data", models.NullBooleanField(default=None)),
-                ("has_spire_data", models.NullBooleanField(default=None)),
-                ("lite_payload", jsonfield.fields.JSONField(default=dict)),
+                ("has_lite_data", models.BooleanField(null=True)),
+                ("has_spire_data", models.BooleanField(null=True)),
+                ("lite_payload", models.JSONField(default=dict)),
                 ("lite_sent_at", models.DateTimeField(blank=True, null=True)),
-                ("lite_accepted_licences", jsonfield.fields.JSONField(default=dict)),
-                ("lite_rejected_licences", jsonfield.fields.JSONField(default=dict)),
-                ("spire_accepted_licences", jsonfield.fields.JSONField(default=dict)),
-                ("spire_rejected_licences", jsonfield.fields.JSONField(default=dict)),
-                ("lite_licences", jsonfield.fields.JSONField(default=dict)),
-                ("spire_licences", jsonfield.fields.JSONField(default=dict)),
-                ("lite_response", jsonfield.fields.JSONField(default=dict)),
+                ("lite_accepted_licences", models.JSONField(default=dict)),
+                ("lite_rejected_licences", models.JSONField(default=dict)),
+                ("spire_accepted_licences", models.JSONField(default=dict)),
+                ("spire_rejected_licences", models.JSONField(default=dict)),
+                ("lite_licences", models.JSONField(default=dict)),
+                ("spire_licences", models.JSONField(default=dict)),
+                ("lite_response", models.JSONField(default=dict)),
                 ("mail", models.ForeignKey(on_delete=django.db.models.deletion.DO_NOTHING, to="mail.Mail")),
             ],
             options={
@@ -134,7 +133,7 @@ class Migration(migrations.Migration):
                         choices=[("insert", "Insert"), ("cancel", "Cancel"), ("update", "Update")], max_length=6
                     ),
                 ),
-                ("data", jsonfield.fields.JSONField(default=dict)),
+                ("data", models.JSONField(default=dict)),
                 ("received_at", models.DateTimeField(default=django.utils.timezone.now)),
                 ("is_processed", models.BooleanField(default=False)),
                 ("old_lite_id", models.UUIDField(null=True)),
diff --git a/mail/migrations/0022_alter_licencedata_licence_payloads.py b/mail/migrations/0022_alter_licencedata_licence_payloads.py
new file mode 100644
index 00000000..7ce206bd
--- /dev/null
+++ b/mail/migrations/0022_alter_licencedata_licence_payloads.py
@@ -0,0 +1,22 @@
+# Generated by Django 4.2.9 on 2024-01-04 14:24
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("mail", "0021_licencepayload_skip_process"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="licencedata",
+            name="licence_payloads",
+            field=models.ManyToManyField(
+                help_text="LicencePayload records linked to this LicenceData instance",
+                related_name="+",
+                to="mail.licencepayload",
+            ),
+        ),
+    ]
diff --git a/mail/models.py b/mail/models.py
index e0f6280f..3c0f081c 100644
--- a/mail/models.py
+++ b/mail/models.py
@@ -125,8 +125,8 @@ class UsageData(models.Model):
     mail = models.ForeignKey(Mail, on_delete=models.DO_NOTHING, null=False)
     spire_run_number = models.IntegerField()
     hmrc_run_number = models.IntegerField()
-    has_lite_data = models.NullBooleanField(default=None)
-    has_spire_data = models.NullBooleanField(default=None)
+    has_lite_data = models.BooleanField(null=True)
+    has_spire_data = models.BooleanField(null=True)
     lite_payload = models.JSONField(default=dict)
     lite_sent_at = models.DateTimeField(blank=True, null=True)  # When update was sent to LITE API
     lite_accepted_licences = models.JSONField(default=list)