diff --git a/.github/workflows/test-build.yaml b/.github/workflows/test-build.yaml
index 125bd0d..5e0b90e 100644
--- a/.github/workflows/test-build.yaml
+++ b/.github/workflows/test-build.yaml
@@ -17,6 +17,9 @@ jobs:
   test-deploy:
     name: Test build
     runs-on: ubuntu-latest
+    # Skip on bot-created PRs — those are tested synchronously by update-submodule.yaml
+    # before the PR is opened, so a second run here would be redundant.
+    if: github.actor != 'github-actions[bot]'
     steps:
       - uses: actions/checkout@v4
         with: