diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index cd0b5e4..81d939b 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -1,15 +1,9 @@
 name: build
 
 on:
-  pull_request:
-    paths:
-      - "srcpkgs/**"
-    types:
-      - opened
-      - reopened
-      - synchronize
-    branches:
-      - main
+  workflow_run:
+    workflows: [PackageUpdate]
+    types: [completed]
   push:
     paths:
       - "srcpkgs/**"
@@ -20,7 +14,7 @@ jobs:
   changedpkgs:
     name: Check package changes
     runs-on: ubuntu-latest
-    if: "!contains(github.event.pull_request.title, '[ci skip]') && !contains(github.event.pull_request.body, '[ci skip]')"
+    if: "${{ github.event.workflow_run.conclusion == 'success' }} && !contains(github.event.pull_request.title, '[ci skip]') && !contains(github.event.pull_request.body, '[ci skip]')"
 
     outputs:
       changed: ${{ steps.grabchanged.outputs.changed }}
diff --git a/.github/workflows/checksum.yaml b/.github/workflows/checksum.yaml
index 18100c8..c99aded 100644
--- a/.github/workflows/checksum.yaml
+++ b/.github/workflows/checksum.yaml
@@ -1,4 +1,4 @@
-name: update packages
+name: PackageUpdate
 
 on:
   pull_request: