diff --git a/sample-configs/ecr.tf b/sample-configs/ecr.tf
index 5ce7bad..5773626 100644
--- a/sample-configs/ecr.tf
+++ b/sample-configs/ecr.tf
@@ -3,8 +3,9 @@ provider "aws" {
 }
 resource "aws_ecr_repository" "scrooge_ecr" {
   name                 = "scrooge-ecr"
+  image_tag_mutability = "IMMUTABLE"
 
   image_scanning_configuration {
     scan_on_push = true
   }
-}
+}
\ No newline at end of file