diff --git a/.github/workflows/manifest.yml b/.github/workflows/manifest.yml
index 0f777b61..7195f3cd 100644
--- a/.github/workflows/manifest.yml
+++ b/.github/workflows/manifest.yml
@@ -10,7 +10,7 @@ on:
       - dev
       - ci-*
   schedule:
-    - cron: '0 0,3,6,9,12,15,18,21 * * *'
+    - cron: '0 0,12 * * *'
   workflow_dispatch:
 
 concurrency: