diff --git a/supervisor/src/main.go b/supervisor/src/main.go
index f38d090..48e1b5d 100644
--- a/supervisor/src/main.go
+++ b/supervisor/src/main.go
@@ -421,7 +421,7 @@ func main() {
 		if match := rijuContainerRegexp.FindStringSubmatch(line); match != nil {
 			name := match[1]
 			created, err := time.Parse(
-				"2006-01-02 15:04:05 -0070 MST",
+				"2006-01-02 15:04:05 -0700 MST",
 				match[2],
 			)
 			if err != nil {
diff --git a/tf/ecr.tf b/tf/ecr.tf
index fd799d4..0ff28e6 100644
--- a/tf/ecr.tf
+++ b/tf/ecr.tf
@@ -1,6 +1,6 @@
 resource "aws_ecr_repository" "riju" {
   name                 = "riju"
-  image_tag_mutability = "IMMUTABLE"
+  image_tag_mutability = "MUTABLE"
 }
 
 resource "aws_ecrpublic_repository" "riju" {