diff --git a/sample-configs/ecr.tf b/sample-configs/ecr.tf
index 5ce7bad..f48a1fa 100644
--- a/sample-configs/ecr.tf
+++ b/sample-configs/ecr.tf
@@ -7,4 +7,6 @@ resource "aws_ecr_repository" "scrooge_ecr" {
   image_scanning_configuration {
     scan_on_push = true
   }
-}
+  
+  image_tag_mutability = "IMMUTABLE"
+}
\ No newline at end of file