diff --git a/types/sqs-producer/index.d.ts b/types/sqs-producer/index.d.ts
index b943101d77..b1a06ee5f6 100644
--- a/types/sqs-producer/index.d.ts
+++ b/types/sqs-producer/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for sqs-producer 1.5
+// Type definitions for sqs-producer 1.6
 // Project: https://github.com/BBC/sqs-producer
 // Definitions by: Daniel Chao <http://dchao.co/>
 //                 John Hamelink <https://johnhamelink.com/>
@@ -29,10 +29,12 @@ export interface ProducerMessage {
   body: string;
   messageAttributes?: { [key: string]: ProducerMessageAttribute };
   delaySeconds?: number;
+  groupId?: string;
+  deduplicationId?: string;
 }
 
 export interface Producer {
-  send(messages: string[] | ProducerMessage[], cb: ProducerCallback<void>): void;
+  send(messages: string | string[] | ProducerMessage | ProducerMessage[], cb: ProducerCallback<void>): void;
   queueSize(cb: ProducerCallback<number>): void;
 }