diff --git a/.github/workflows/pr-builder.yaml b/.github/workflows/pr-builder.yaml
index 5e9e32cc..b954e50b 100644
--- a/.github/workflows/pr-builder.yaml
+++ b/.github/workflows/pr-builder.yaml
@@ -11,7 +11,7 @@ on:
 
 jobs:
   run:
-    runs-on: ubuntu-latest
+    runs-on: linux-amd64-cpu4
     steps:
       # This reusable workflow should depend on all other jobs in the calling workflow.
       - name: "Check all dependent jobs"