diff --git a/infrastructure/terraform/lambda/_template/main.tf b/infrastructure/terraform/lambda/_template/main.tf
index 89e6c4c1..c6015ea1 100644
--- a/infrastructure/terraform/lambda/_template/main.tf
+++ b/infrastructure/terraform/lambda/_template/main.tf
@@ -36,6 +36,8 @@ module "lambda" {
   # Optional: Set maximum_concurrency to limit concurrent SQS-triggered invocations (2-1000)
   maximum_concurrency = var.maximum_concurrency
 
+  batch_size = var.batch_size
+
   environment = {
     STAGE = var.stage
     LOG_LEVEL = "info"
diff --git a/infrastructure/terraform/lambda/_template/variables.tf b/infrastructure/terraform/lambda/_template/variables.tf
index e0061321..e7646811 100644
--- a/infrastructure/terraform/lambda/_template/variables.tf
+++ b/infrastructure/terraform/lambda/_template/variables.tf
@@ -23,6 +23,11 @@ variable "maximum_concurrency" {
   description = "Maximum number of concurrent Lambda invocations from SQS (2-1000). null = no limit."
 }
 
+variable "batch_size" {
+  type    = number
+  default = 1
+}
+
 locals {
   image_uri = "${var.ecr_repo_url}@${var.image_digest}"
 }
diff --git a/infrastructure/terraform/lambda/categorisation/main.tf b/infrastructure/terraform/lambda/categorisation/main.tf
index 6e30dd8e..cfa2e0e1 100644
--- a/infrastructure/terraform/lambda/categorisation/main.tf
+++ b/infrastructure/terraform/lambda/categorisation/main.tf
@@ -20,9 +20,9 @@ module "lambda" {
 
   name  = "categorisation"
   stage = var.stage
-
   image_uri = local.image_uri
-
+  maximum_concurrency = var.maximum_concurrency
+  batch_size = var.batch_size
 
   environment = merge(
     {
diff --git a/infrastructure/terraform/lambda/categorisation/variables.tf b/infrastructure/terraform/lambda/categorisation/variables.tf
index 347964de..23a78875 100644
--- a/infrastructure/terraform/lambda/categorisation/variables.tf
+++ b/infrastructure/terraform/lambda/categorisation/variables.tf
@@ -23,6 +23,11 @@ variable "maximum_concurrency" {
   description = "Maximum number of concurrent Lambda invocations from SQS (2-1000). null = no limit."
 }
 
+variable "batch_size" {
+  type    = number
+  default = 2
+}
+
 locals {
   image_uri = "${var.ecr_repo_url}@${var.image_digest}"
 }