diff --git a/main.tf b/main.tf
index b9dc9721..114e85d6 100644
--- a/main.tf
+++ b/main.tf
@@ -53,6 +53,9 @@ resource "aws_lambda_function" "notify_slack" {
   }
 
   lifecycle {
-    ignore_changes = ["filename"]
+    ignore_changes = [
+      "filename",
+      "last_modified",
+    ]
   }
 }