diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 872a458..da2dce3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-latest, blacksmith-4vcpu-windows-2025]
         python-version: ["3.10", "3.11", "3.12", "3.13"]
     
     defaults:
@@ -52,7 +52,7 @@ jobs:
 
   lint:
     name: Lint & Format
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     
     defaults:
       run:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b178c0f..cd67b34 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -25,13 +25,13 @@ jobs:
     strategy:
       matrix:
         platform:
-          - runner: ubuntu-latest
+          - runner: blacksmith-4vcpu-ubuntu-2404
             target: x86_64
-          - runner: ubuntu-latest
+          - runner: blacksmith-4vcpu-ubuntu-2404
             target: x86
-          - runner: ubuntu-latest
+          - runner: blacksmith-4vcpu-ubuntu-2404
             target: aarch64
-          - runner: ubuntu-latest
+          - runner: blacksmith-4vcpu-ubuntu-2404
             target: armv7
     
     defaults:
@@ -67,9 +67,9 @@ jobs:
     strategy:
       matrix:
         platform:
-          - runner: ubuntu-latest
+          - runner: blacksmith-4vcpu-ubuntu-2404
             target: x86_64
-          - runner: ubuntu-latest
+          - runner: blacksmith-4vcpu-ubuntu-2404
             target: aarch64
     
     defaults:
@@ -105,9 +105,9 @@ jobs:
     strategy:
       matrix:
         platform:
-          - runner: windows-latest
+          - runner: blacksmith-4vcpu-windows-2025
             target: x64
-          - runner: windows-latest
+          - runner: blacksmith-4vcpu-windows-2025
             target: x86
     
     defaults:
@@ -175,7 +175,7 @@ jobs:
           path: workspaces/rust/klaw-dbase/dist
 
   sdist:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     
     defaults:
       run:
@@ -199,7 +199,7 @@ jobs:
 
   publish:
     name: Publish to PyPI
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     needs: [linux, musllinux, windows, macos, sdist]
     if: startsWith(github.ref, 'refs/tags/') && !inputs.dry_run