diff --git a/lib/shopify_api/rest/resources/2025_01/fulfillment.rb b/lib/shopify_api/rest/resources/2025_01/fulfillment.rb
index d2c220bc6..a02c4b6df 100644
--- a/lib/shopify_api/rest/resources/2025_01/fulfillment.rb
+++ b/lib/shopify_api/rest/resources/2025_01/fulfillment.rb
@@ -63,7 +63,7 @@ def initialize(session: ShopifyAPI::Context.active_session, from_hash: nil)
     attr_reader :location_id
     sig { returns(T.nilable(String)) }
     attr_reader :name
-    sig { returns(T.nilable(Integer)) }
+    sig { returns(T.nilable(T::Boolean)) }
     attr_reader :notify_customer
     sig { returns(T.nilable(Integer)) }
     attr_reader :order_id