diff --git a/src/index.ts b/src/index.ts
index 1a2326011..9df8793bd 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -97,6 +97,11 @@ type TwilioSenderListClient = {
 				};
 			};
 		};
+		v1: {
+			services: (sid: string) => {
+				update: (params: Record<string, string>) => Promise<unknown>;
+			};
+		};
 	};
 	incomingPhoneNumbers: IncomingPhoneNumbersClient;
 };