diff --git a/.github/workflows/update-runtime-chart.yml b/.github/workflows/update-runtime-chart.yml
index b9fa346..1065d71 100644
--- a/.github/workflows/update-runtime-chart.yml
+++ b/.github/workflows/update-runtime-chart.yml
@@ -1,8 +1,8 @@
 name: Update Runtime Chart
 
 on:
-  repository_dispatch:
-    types: [runtime-released]
+  schedule:
+    - cron: '0 * * * *'
   workflow_dispatch:
 
 permissions: {}
diff --git a/charts/multica-runtime-controller/README.md b/charts/multica-runtime-controller/README.md
index 48fb10f..904ec75 100644
--- a/charts/multica-runtime-controller/README.md
+++ b/charts/multica-runtime-controller/README.md
@@ -59,10 +59,9 @@ in the [controller repository](https://github.com/korioinc/multica-runtime-contr
 
 ## Release automation
 
-After publishing a verified multi-platform image and GitHub Release, the runtime
-repository sends a `runtime-released` repository dispatch with the runtime
-version, manifest digest, and source revision. The chart update workflow also
-supports manual `workflow_dispatch` execution from GitHub Actions. Each run
-checks the public GHCR package, updates `appVersion`, both digest-pinned image
-references, and the Artifact Hub annotations, then increments the chart patch
-version and publishes the new package.
+The chart update workflow polls the public GHCR package hourly and supports the
+same check through manual `workflow_dispatch` execution from GitHub Actions.
+When a run discovers a newer stable runtime, the Helm-owned flow updates
+`appVersion`, both digest-pinned image references, and the Artifact Hub
+annotations, then increments the chart patch version and publishes the new
+package.