diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ba89210..8a6fc9f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     strategy:
       matrix:
         python-version: ['3.10', '3.11', '3.12']
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 5c39737..dcce1ce 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -11,7 +11,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     strategy:
       matrix:
         python-version: ['3.10', '3.11', '3.12']
@@ -45,7 +45,7 @@ jobs:
 
   publish:
     needs: build
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     permissions:
       contents: read
       id-token: write  # Required for trusted publishing