diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index b7bb7d52..1fbdb8f7 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v1707
\ No newline at end of file
+v1708
\ No newline at end of file
diff --git a/rbi/stripe.rbi b/rbi/stripe.rbi
index 2444ad0f..cb43420f 100644
--- a/rbi/stripe.rbi
+++ b/rbi/stripe.rbi
@@ -44872,7 +44872,7 @@ module Stripe
         sig { returns(T.nilable(ProrationDetails)) }
         attr_reader :proration_details
         # The subscription that the subscription item belongs to
-        sig { returns(String) }
+        sig { returns(T.nilable(String)) }
         attr_reader :subscription
         # The subscription item that generated this line item
         sig { returns(String) }
diff --git a/rbi/stripe/resources/invoice_line_item.rbi b/rbi/stripe/resources/invoice_line_item.rbi
index 1d211e95..ec78084f 100644
--- a/rbi/stripe/resources/invoice_line_item.rbi
+++ b/rbi/stripe/resources/invoice_line_item.rbi
@@ -75,7 +75,7 @@ module Stripe
         sig { returns(T.nilable(ProrationDetails)) }
         attr_reader :proration_details
         # The subscription that the subscription item belongs to
-        sig { returns(String) }
+        sig { returns(T.nilable(String)) }
         attr_reader :subscription
         # The subscription item that generated this line item
         sig { returns(String) }