diff --git a/.github/workflows/deploy.yaml b/.github/workflows/deploy.yaml
index 95053fc..4667c5a 100644
--- a/.github/workflows/deploy.yaml
+++ b/.github/workflows/deploy.yaml
@@ -1,7 +1,9 @@
 name: Deploy
+# PLAT-77: push-to-main CDK deploy is frozen so HCP Terraform is the only
+# path that can change this stack. workflow_dispatch stays for an explicit
+# rollback of the management-account stack.
 on:
-  push:
-    branches: [main]
+  workflow_dispatch:
 
 permissions:
   id-token: write