diff --git a/api/organisations/constants.py b/api/organisations/constants.py
index 26e9c93a2a9a..4cbdff0ba3fb 100644
--- a/api/organisations/constants.py
+++ b/api/organisations/constants.py
@@ -1,4 +1,4 @@
-API_USAGE_ALERT_THRESHOLDS = [75, 90, 100, 120]
+API_USAGE_ALERT_THRESHOLDS = [75, 90, 100, 120, 200, 300, 400, 500]
 API_USAGE_GRACE_PERIOD = 7
 ALERT_EMAIL_MESSAGE = (
     "Organisation %s has used %d seats which is over their plan limit of %d (plan: %s)"
diff --git a/api/organisations/migrations/0055_alter_percent_usage.py b/api/organisations/migrations/0055_alter_percent_usage.py
new file mode 100644
index 000000000000..96e0d3008742
--- /dev/null
+++ b/api/organisations/migrations/0055_alter_percent_usage.py
@@ -0,0 +1,19 @@
+# Generated by Django 3.2.25 on 2024-06-26 18:11
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('organisations', '0054_create_api_billing'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='organisationapiusagenotification',
+            name='percent_usage',
+            field=models.IntegerField(validators=[django.core.validators.MinValueValidator(75), django.core.validators.MaxValueValidator(500)]),
+        ),
+    ]
diff --git a/api/organisations/models.py b/api/organisations/models.py
index 436a9b512da4..9a421ca5467d 100644
--- a/api/organisations/models.py
+++ b/api/organisations/models.py
@@ -468,7 +468,7 @@ class OrganisationAPIUsageNotification(models.Model):
     )
     percent_usage = models.IntegerField(
         null=False,
-        validators=[MinValueValidator(75), MaxValueValidator(120)],
+        validators=[MinValueValidator(75), MaxValueValidator(500)],
     )
     notified_at = models.DateTimeField(null=True)