diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f4216e056bb..5e8a797ce74 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
   # Detect docs-only changes to skip heavy jobs (test, build, Windows, macOS, Android).
   # Lint and format always run. Fail-safe: if detection fails, run everything.
   docs-scope:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     outputs:
       docs_only: ${{ steps.check.outputs.docs_only }}
       docs_changed: ${{ steps.check.outputs.docs_changed }}
@@ -33,7 +33,7 @@ jobs:
   changed-scope:
     needs: [docs-scope]
     if: needs.docs-scope.outputs.docs_only != 'true'
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     outputs:
       run_node: ${{ steps.scope.outputs.run_node }}
       run_macos: ${{ steps.scope.outputs.run_macos }}