diff --git a/.github/workflows/check-outdated-content.yml b/.github/workflows/check-outdated-content.yml
index e7f2450d..16e9534c 100644
--- a/.github/workflows/check-outdated-content.yml
+++ b/.github/workflows/check-outdated-content.yml
@@ -6,6 +6,8 @@ name: Check outdated content
 
 on:
   pull_request:
+    branches:
+      - main
   workflow_dispatch:
 
 jobs: