diff --git a/src/orb/resources/customers/costs.py b/src/orb/resources/customers/costs.py
index a735203e..2ca9ea8e 100644
--- a/src/orb/resources/customers/costs.py
+++ b/src/orb/resources/customers/costs.py
@@ -43,8 +43,8 @@ def list(
         self,
         customer_id: Optional[str],
         *,
-        timeframe_end: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
-        timeframe_start: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
+        timeframe_end: Union[str, datetime] | NotGiven = NOT_GIVEN,
+        timeframe_start: Union[str, datetime] | NotGiven = NOT_GIVEN,
         view_mode: Optional[Literal["periodic", "cumulative"]] | 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.
@@ -232,8 +232,8 @@ def list_by_external_id(
         self,
         external_customer_id: Optional[str],
         *,
-        timeframe_end: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
-        timeframe_start: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
+        timeframe_end: Union[str, datetime] | NotGiven = NOT_GIVEN,
+        timeframe_start: Union[str, datetime] | NotGiven = NOT_GIVEN,
         view_mode: Optional[Literal["periodic", "cumulative"]] | 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.
@@ -433,8 +433,8 @@ async def list(
         self,
         customer_id: Optional[str],
         *,
-        timeframe_end: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
-        timeframe_start: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
+        timeframe_end: Union[str, datetime] | NotGiven = NOT_GIVEN,
+        timeframe_start: Union[str, datetime] | NotGiven = NOT_GIVEN,
         view_mode: Optional[Literal["periodic", "cumulative"]] | 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.
@@ -622,8 +622,8 @@ async def list_by_external_id(
         self,
         external_customer_id: Optional[str],
         *,
-        timeframe_end: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
-        timeframe_start: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
+        timeframe_end: Union[str, datetime] | NotGiven = NOT_GIVEN,
+        timeframe_start: Union[str, datetime] | NotGiven = NOT_GIVEN,
         view_mode: Optional[Literal["periodic", "cumulative"]] | 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/orb/resources/subscriptions.py b/src/orb/resources/subscriptions.py
index 439361df..92cef2f5 100644
--- a/src/orb/resources/subscriptions.py
+++ b/src/orb/resources/subscriptions.py
@@ -757,8 +757,8 @@ def fetch_costs(
         self,
         subscription_id: str,
         *,
-        timeframe_end: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
-        timeframe_start: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
+        timeframe_end: Union[str, datetime] | NotGiven = NOT_GIVEN,
+        timeframe_start: Union[str, datetime] | NotGiven = NOT_GIVEN,
         view_mode: Optional[Literal["periodic", "cumulative"]] | 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.
@@ -2387,8 +2387,8 @@ async def fetch_costs(
         self,
         subscription_id: str,
         *,
-        timeframe_end: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
-        timeframe_start: Union[str, datetime, None] | NotGiven = NOT_GIVEN,
+        timeframe_end: Union[str, datetime] | NotGiven = NOT_GIVEN,
+        timeframe_start: Union[str, datetime] | NotGiven = NOT_GIVEN,
         view_mode: Optional[Literal["periodic", "cumulative"]] | 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/orb/types/customers/cost_list_by_external_id_params.py b/src/orb/types/customers/cost_list_by_external_id_params.py
index 9455e18e..44d04388 100644
--- a/src/orb/types/customers/cost_list_by_external_id_params.py
+++ b/src/orb/types/customers/cost_list_by_external_id_params.py
@@ -12,10 +12,10 @@
 
 
 class CostListByExternalIDParams(TypedDict, total=False):
-    timeframe_end: Annotated[Union[str, datetime, None], PropertyInfo(format="iso8601")]
+    timeframe_end: Annotated[Union[str, datetime], PropertyInfo(format="iso8601")]
     """Costs returned are exclusive of `timeframe_end`."""
 
-    timeframe_start: Annotated[Union[str, datetime, None], PropertyInfo(format="iso8601")]
+    timeframe_start: Annotated[Union[str, datetime], PropertyInfo(format="iso8601")]
     """Costs returned are inclusive of `timeframe_start`."""
 
     view_mode: Optional[Literal["periodic", "cumulative"]]
diff --git a/src/orb/types/customers/cost_list_params.py b/src/orb/types/customers/cost_list_params.py
index 041cf861..55d1b50b 100644
--- a/src/orb/types/customers/cost_list_params.py
+++ b/src/orb/types/customers/cost_list_params.py
@@ -12,10 +12,10 @@
 
 
 class CostListParams(TypedDict, total=False):
-    timeframe_end: Annotated[Union[str, datetime, None], PropertyInfo(format="iso8601")]
+    timeframe_end: Annotated[Union[str, datetime], PropertyInfo(format="iso8601")]
     """Costs returned are exclusive of `timeframe_end`."""
 
-    timeframe_start: Annotated[Union[str, datetime, None], PropertyInfo(format="iso8601")]
+    timeframe_start: Annotated[Union[str, datetime], PropertyInfo(format="iso8601")]
     """Costs returned are inclusive of `timeframe_start`."""
 
     view_mode: Optional[Literal["periodic", "cumulative"]]
diff --git a/src/orb/types/subscription_fetch_costs_params.py b/src/orb/types/subscription_fetch_costs_params.py
index b929aad3..9a9fa456 100644
--- a/src/orb/types/subscription_fetch_costs_params.py
+++ b/src/orb/types/subscription_fetch_costs_params.py
@@ -12,10 +12,10 @@
 
 
 class SubscriptionFetchCostsParams(TypedDict, total=False):
-    timeframe_end: Annotated[Union[str, datetime, None], PropertyInfo(format="iso8601")]
+    timeframe_end: Annotated[Union[str, datetime], PropertyInfo(format="iso8601")]
     """Costs returned are exclusive of `timeframe_end`."""
 
-    timeframe_start: Annotated[Union[str, datetime, None], PropertyInfo(format="iso8601")]
+    timeframe_start: Annotated[Union[str, datetime], PropertyInfo(format="iso8601")]
     """Costs returned are inclusive of `timeframe_start`."""
 
     view_mode: Optional[Literal["periodic", "cumulative"]]