diff --git a/.github/workflows/build-swtbench-images.yml b/.github/workflows/build-swtbench-images.yml
index c9c5fd9b7..e6c7b1eaa 100644
--- a/.github/workflows/build-swtbench-images.yml
+++ b/.github/workflows/build-swtbench-images.yml
@@ -116,7 +116,8 @@ jobs:
     # regress past 10h again, reopen that discussion rather than silently raising.
     timeout-minutes: 600
 
-    runs-on: ubuntu-latest-8core
+    runs-on:
+      labels: blacksmith-32vcpu-ubuntu-2204
 
     permissions:
       contents: read
@@ -171,8 +172,8 @@ jobs:
           git add vendor/software-agent-sdk
           echo "Updated SDK submodule to $SDK_SHA (from ${{ inputs.sdk-commit }})"
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v4
+      - name: Set up Docker Buildx with Blacksmith
+        uses: useblacksmith/setup-docker-builder@v1
 
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3