diff --git a/.github/workflows/pkgup.yaml b/.github/workflows/pkgup.yaml
index d1064cc41..67541f4e6 100644
--- a/.github/workflows/pkgup.yaml
+++ b/.github/workflows/pkgup.yaml
@@ -7,7 +7,11 @@ concurrency:
   group: "pages"
   cancel-in-progress: true
 
-on: [push]
+on:
+  push:
+    branches:
+      - 'master'
+
 jobs:
   build:
     name: data.table