diff --git a/assemblyline/odm/models/service.py b/assemblyline/odm/models/service.py
index 8076e21f3..42d266ab6 100644
--- a/assemblyline/odm/models/service.py
+++ b/assemblyline/odm/models/service.py
@@ -1,9 +1,13 @@
 from __future__ import annotations
+
 from typing import Optional as Opt
 
 from assemblyline import odm
 from assemblyline.common import forge
-from assemblyline.common.constants import DEFAULT_SERVICE_ACCEPTS, DEFAULT_SERVICE_REJECTS
+from assemblyline.common.constants import (
+    DEFAULT_SERVICE_ACCEPTS,
+    DEFAULT_SERVICE_REJECTS,
+)
 
 Classification = forge.get_classification()
 
@@ -94,8 +98,8 @@ class UpdateSource(odm.Model):
                                              description="Update check interval, in seconds, for this source")
     ignore_cache: bool = odm.Boolean(default=False,
                                      description="Ignore source caching and forcefully fetch from source")
-    post_data: dict = odm.Mapping(odm.Any(), default={}, index=False, store=False,
-                                  description="Data that's sent in a POST request (`fetch_method=\"POST\"`)")
+    data: str = odm.Optional(odm.Text(), index=False, store=False,
+                             description="Data that's sent in a POST request (`fetch_method=\"POST\"`)")
 
 
 
diff --git a/assemblyline/odm/models/service_delta.py b/assemblyline/odm/models/service_delta.py
index dfee952c7..707b0eb02 100644
--- a/assemblyline/odm/models/service_delta.py
+++ b/assemblyline/odm/models/service_delta.py
@@ -1,8 +1,7 @@
 from __future__ import annotations
 
 from assemblyline import odm
-from assemblyline.odm.models.service import SIGNATURE_DELIMITERS, FETCH_METHODS
-
+from assemblyline.odm.models.service import FETCH_METHODS, SIGNATURE_DELIMITERS
 
 REF_DEPENDENCY_CONFIG = "Refer to:<br>[Service - DependencyConfig](../service/#dependencyconfig)"
 REF_DOCKER_CONFIG = "Refer to:<br>[Service - DockerConfig](../service/#dockerconfig)"
@@ -58,7 +57,7 @@ class UpdateSourceDelta(odm.Model):
     configuration = odm.Optional(odm.Mapping(odm.Any(), default={}), description=REF_UPDATE_SOURCE)
     update_interval = odm.Optional(odm.Integer(min=0), description=REF_UPDATE_SOURCE)
     ignore_cache = odm.Optional(odm.Boolean(default=False), description=REF_UPDATE_SOURCE)
-    post_data = odm.Optional(odm.Mapping(odm.Any(), default={}), description=REF_UPDATE_SOURCE)
+    data = odm.Optional(odm.Text(), description=REF_UPDATE_SOURCE)
 
 
 @ odm.model(index=False, store=False)