diff --git a/.github/workflows/preview-create.yml b/.github/workflows/preview-create.yml
index 48a76c4..4b1a2c0 100644
--- a/.github/workflows/preview-create.yml
+++ b/.github/workflows/preview-create.yml
@@ -9,7 +9,7 @@ on:
         description: Region which this preview infrastructure resides.
       region:
         type: string
-        required: true
+        default: ap-southeast-2
         description: Region which this preview infrastructure resides.
       eks_cluster_name:
         default: true
diff --git a/.github/workflows/preview-delete.yml b/.github/workflows/preview-delete.yml
index 629a923..6867bcd 100644
--- a/.github/workflows/preview-delete.yml
+++ b/.github/workflows/preview-delete.yml
@@ -9,7 +9,7 @@ on:
         description: Region which this preview infrastructure resides.
       region:
         type: string
-        required: true
+        default: ap-southeast-2
         description: Region which this preview infrastructure resides.
       eks_cluster_name:
         default: true