diff --git a/.stats.yml b/.stats.yml
index 6229fe6e..efc251f3 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 47
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/conductor%2Fconductor-4ca93a32ea3ad6872cb231c5f097a9099ffdd67a9607dcd6ce717d4b76d5a3bf.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/conductor%2Fconductor-982a4af6cedb8c9611819a4aff9770de59d9157b557926ca26f360077f49e1df.yml
diff --git a/src/conductor/resources/qbd/bills.py b/src/conductor/resources/qbd/bills.py
index f6e8a25d..88f72e7f 100644
--- a/src/conductor/resources/qbd/bills.py
+++ b/src/conductor/resources/qbd/bills.py
@@ -55,7 +55,7 @@ def create(
         vendor_id: str,
         conductor_end_user_id: str,
         accounts_payable_account_id: str | NotGiven = NOT_GIVEN,
-        due_date: str | NotGiven = NOT_GIVEN,
+        due_date: Union[str, date] | NotGiven = NOT_GIVEN,
         exchange_rate: float | NotGiven = NOT_GIVEN,
         expense_lines: Iterable[bill_create_params.ExpenseLine] | NotGiven = NOT_GIVEN,
         external_id: str | NotGiven = NOT_GIVEN,
@@ -66,7 +66,7 @@ def create(
         ref_number: str | NotGiven = NOT_GIVEN,
         sales_tax_code_id: str | NotGiven = NOT_GIVEN,
         terms_id: str | NotGiven = NOT_GIVEN,
-        transaction_date: str | NotGiven = NOT_GIVEN,
+        transaction_date: Union[str, date] | NotGiven = NOT_GIVEN,
         vendor_address: bill_create_params.VendorAddress | NotGiven = NOT_GIVEN,
         # Use the following arguments if you need to pass additional parameters to the API that aren't available via kwargs.
         # The extra values given here take precedence over values defined on the client or passed to this method.
@@ -347,7 +347,7 @@ async def create(
         vendor_id: str,
         conductor_end_user_id: str,
         accounts_payable_account_id: str | NotGiven = NOT_GIVEN,
-        due_date: str | NotGiven = NOT_GIVEN,
+        due_date: Union[str, date] | NotGiven = NOT_GIVEN,
         exchange_rate: float | NotGiven = NOT_GIVEN,
         expense_lines: Iterable[bill_create_params.ExpenseLine] | NotGiven = NOT_GIVEN,
         external_id: str | NotGiven = NOT_GIVEN,
@@ -358,7 +358,7 @@ async def create(
         ref_number: str | NotGiven = NOT_GIVEN,
         sales_tax_code_id: str | NotGiven = NOT_GIVEN,
         terms_id: str | NotGiven = NOT_GIVEN,
-        transaction_date: str | NotGiven = NOT_GIVEN,
+        transaction_date: Union[str, date] | NotGiven = NOT_GIVEN,
         vendor_address: bill_create_params.VendorAddress | NotGiven = NOT_GIVEN,
         # Use the following arguments if you need to pass additional parameters to the API that aren't available via kwargs.
         # The extra values given here take precedence over values defined on the client or passed to this method.
diff --git a/src/conductor/types/qbd/bill_create_params.py b/src/conductor/types/qbd/bill_create_params.py
index 3a89ad44..675863d3 100644
--- a/src/conductor/types/qbd/bill_create_params.py
+++ b/src/conductor/types/qbd/bill_create_params.py
@@ -2,7 +2,8 @@
 
 from __future__ import annotations
 
-from typing import List, Iterable
+from typing import List, Union, Iterable
+from datetime import date
 from typing_extensions import Literal, Required, Annotated, TypedDict
 
 from ..._utils import PropertyInfo
@@ -31,7 +32,7 @@ class BillCreateParams(TypedDict, total=False):
 
     accounts_payable_account_id: Annotated[str, PropertyInfo(alias="accountsPayableAccountId")]
 
-    due_date: Annotated[str, PropertyInfo(alias="dueDate")]
+    due_date: Annotated[Union[str, date], PropertyInfo(alias="dueDate", format="iso8601")]
     """The date when the payment is due, in ISO 8601 format (YYYY-MM-DD)."""
 
     exchange_rate: Annotated[float, PropertyInfo(alias="exchangeRate")]
@@ -64,7 +65,7 @@ class BillCreateParams(TypedDict, total=False):
 
     terms_id: Annotated[str, PropertyInfo(alias="termsId")]
 
-    transaction_date: Annotated[str, PropertyInfo(alias="transactionDate")]
+    transaction_date: Annotated[Union[str, date], PropertyInfo(alias="transactionDate", format="iso8601")]
 
     vendor_address: Annotated[VendorAddress, PropertyInfo(alias="vendorAddress")]
 
diff --git a/tests/api_resources/qbd/test_bills.py b/tests/api_resources/qbd/test_bills.py
index 2393b584..dd0866d5 100644
--- a/tests/api_resources/qbd/test_bills.py
+++ b/tests/api_resources/qbd/test_bills.py
@@ -33,7 +33,7 @@ def test_method_create_with_all_params(self, client: Conductor) -> None:
             vendor_id="vendorId",
             conductor_end_user_id="end_usr_1234567abcdefg",
             accounts_payable_account_id="accountsPayableAccountId",
-            due_date="dueDate",
+            due_date=parse_date("2019-12-27"),
             exchange_rate=0,
             expense_lines=[
                 {
@@ -320,7 +320,7 @@ def test_method_create_with_all_params(self, client: Conductor) -> None:
             ref_number="CHARGE-1234",
             sales_tax_code_id="salesTaxCodeId",
             terms_id="termsId",
-            transaction_date="transactionDate",
+            transaction_date=parse_date("2019-12-27"),
             vendor_address={
                 "city": "San Francisco",
                 "country": "United States",
@@ -479,7 +479,7 @@ async def test_method_create_with_all_params(self, async_client: AsyncConductor)
             vendor_id="vendorId",
             conductor_end_user_id="end_usr_1234567abcdefg",
             accounts_payable_account_id="accountsPayableAccountId",
-            due_date="dueDate",
+            due_date=parse_date("2019-12-27"),
             exchange_rate=0,
             expense_lines=[
                 {
@@ -766,7 +766,7 @@ async def test_method_create_with_all_params(self, async_client: AsyncConductor)
             ref_number="CHARGE-1234",
             sales_tax_code_id="salesTaxCodeId",
             terms_id="termsId",
-            transaction_date="transactionDate",
+            transaction_date=parse_date("2019-12-27"),
             vendor_address={
                 "city": "San Francisco",
                 "country": "United States",