diff --git a/stacks/gp-registrations-mi/terraform/lambda_layer.tf b/stacks/gp-registrations-mi/terraform/lambda_layer.tf
index 7024dbf..56068c4 100644
--- a/stacks/gp-registrations-mi/terraform/lambda_layer.tf
+++ b/stacks/gp-registrations-mi/terraform/lambda_layer.tf
@@ -3,4 +3,5 @@ resource "aws_lambda_layer_version" "mi_enrichment" {
   layer_name               = "${var.environment}_mi_enrichment_layer"
   compatible_runtimes      = ["python3.12"]
   compatible_architectures = ["x86_64"]
-}
\ No newline at end of file
+  source_code_hash         = filebase64sha256(var.mi_enrichment_lambda_layer_zip)
+}