diff --git a/src/sayari/project/types/project_entities_filter.py b/src/sayari/project/types/project_entities_filter.py
index 92ecc64..8fc03ca 100644
--- a/src/sayari/project/types/project_entities_filter.py
+++ b/src/sayari/project/types/project_entities_filter.py
@@ -81,7 +81,7 @@ class ProjectEntitiesFilter(UniversalBaseModel):
     Filter by a geographical bounding box. The value is a pipe-delimited set of four values representing the top, left, bottom, and right sides of the bounding box, in that order. The pipes should be URL-encoded as `%7C`. The top coordinate must greater than the bottom coordinate, and the left coordinate must be less than the right coordinate. A sample is `55.680357237879136|-71.53607290158526|41.10876347746233|-40.963927098414736`
     """
 
-    custom_field_name: typing.Optional[typing.List[str]] = pydantic.Field(alias="custom_<field name>", default=None)
+    custom_field_name: typing.Optional[typing.List[str]] = pydantic.Field(alias="custom_{field name}", default=None)
     """
     <Warning>This property is in beta and is subject to change. It is provided for early access and testing purposes only.</Warning> custom user key/value pairs (key must be prefixed with "custom\_" and value must be "string" type)
     """
diff --git a/src/sayari/project/types/sort_field.py b/src/sayari/project/types/sort_field.py
index f4b73cd..30be8f2 100644
--- a/src/sayari/project/types/sort_field.py
+++ b/src/sayari/project/types/sort_field.py
@@ -16,8 +16,8 @@
         "-latest_status",
         "label",
         "-label",
-        "custom_<field name>",
-        "-custom_<field name>",
+        "custom_{field name}",
+        "-custom_{field name}",
         "receiver_of",
         "-receiver_of",
         "shipper_of",
diff --git a/src/sayari/resolution/types/resolution_persisted_response_fields.py b/src/sayari/resolution/types/resolution_persisted_response_fields.py
index d8b7298..0ef5d14 100644
--- a/src/sayari/resolution/types/resolution_persisted_response_fields.py
+++ b/src/sayari/resolution/types/resolution_persisted_response_fields.py
@@ -7,7 +7,7 @@
 
 
 class ResolutionPersistedResponseFields(ResolutionResponseFields):
-    custom_field_name: typing.Optional[str] = pydantic.Field(alias="custom_<field name>", default=None)
+    custom_field_name: typing.Optional[str] = pydantic.Field(alias="custom_{field name}", default=None)
     """
     <Warning>This property is in beta and is subject to change. It is provided for early access and testing purposes only.</Warning> custom user key/value pairs (key must be prefixed with "custom\_" and value must be "string" type)
     """