diff --git a/lambda-event/src/main/scala/zio/lambda/event/SQSEvent.scala b/lambda-event/src/main/scala/zio/lambda/event/SQSEvent.scala
index 3f1812d..505a42c 100644
--- a/lambda-event/src/main/scala/zio/lambda/event/SQSEvent.scala
+++ b/lambda-event/src/main/scala/zio/lambda/event/SQSEvent.scala
@@ -13,7 +13,7 @@ final case class SQSRecord(
   receiptHandle: String,
   body: String,
   md5OfBody: String,
-  md5OfMessageAttributes: String,
+  md5OfMessageAttributes: Option[String],
   eventSourceARN: String,
   eventSource: String,
   awsRegion: String,
diff --git a/lambda-event/src/test/scala/zio/lambda/event/JavaLambdaEventsGen.scala b/lambda-event/src/test/scala/zio/lambda/event/JavaLambdaEventsGen.scala
index 5d22c1a..5a1e4bc 100644
--- a/lambda-event/src/test/scala/zio/lambda/event/JavaLambdaEventsGen.scala
+++ b/lambda-event/src/test/scala/zio/lambda/event/JavaLambdaEventsGen.scala
@@ -159,7 +159,7 @@ object JavaLambdaEventsGen {
       receiptHandle          <- Gen.string
       body                   <- Gen.string
       md5OfBody              <- Gen.string
-      md5OfMessageAttributes <- Gen.string
+      md5OfMessageAttributes <- Gen.option(Gen.string)
       eventSourceArn         <- Gen.string
       eventSource            <- Gen.string
       awsRegion              <- Gen.string
@@ -171,7 +171,7 @@ object JavaLambdaEventsGen {
       sqsMessage.setReceiptHandle(receiptHandle)
       sqsMessage.setBody(body)
       sqsMessage.setMd5OfBody(md5OfBody)
-      sqsMessage.setMd5OfMessageAttributes(md5OfMessageAttributes)
+      md5OfMessageAttributes.foreach(attributes => sqsMessage.setMd5OfMessageAttributes(attributes))
       sqsMessage.setEventSourceArn(eventSourceArn)
       sqsMessage.setEventSource(eventSource)
       sqsMessage.setAwsRegion(awsRegion)