diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e61c36ff..1966acde 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -199,7 +199,7 @@ jobs:
   windows:
     if: github.event.pull_request.draft != true
     timeout-minutes: 30
-    runs-on: ${{ matrix.vs.runner }}
+    runs-on: ${{ github.repository == 'libfn/functional' && matrix.vs.warp || matrix.vs.runner }}
     strategy:
       fail-fast: false
       matrix:
@@ -212,8 +212,10 @@ jobs:
           # Use explicit image labels to keep coverage of both Visual Studio versions.
           - generator: "Visual Studio 17 2022"
             runner: "windows-2022"
+            warp: "warp-windows-2022-x64-8x"
           - generator: "Visual Studio 18 2026"
             runner: "windows-2025-vs2026"
+            warp: "warp-windows-2025-vs2026-x64-8x"
 
     steps:
     - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
diff --git a/.github/workflows/package-test-conan.yml b/.github/workflows/package-test-conan.yml
index 3c2aadd2..d486e0da 100644
--- a/.github/workflows/package-test-conan.yml
+++ b/.github/workflows/package-test-conan.yml
@@ -62,7 +62,7 @@ jobs:
 
   test_conan_windows:
     if: github.event.pull_request.draft != true
-    runs-on: windows-2025-vs2026
+    runs-on: ${{ github.repository == 'libfn/functional' && 'warp-windows-2025-vs2026-x64-8x' || 'windows-2025-vs2026' }}
 
     steps:
     - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
diff --git a/.github/workflows/package-test-vcpkg.yml b/.github/workflows/package-test-vcpkg.yml
index 1b4a37e3..9ccad75d 100644
--- a/.github/workflows/package-test-vcpkg.yml
+++ b/.github/workflows/package-test-vcpkg.yml
@@ -60,7 +60,7 @@ jobs:
 
   test_vcpkg_windows:
     if: github.event.pull_request.draft != true
-    runs-on: windows-2025-vs2026
+    runs-on: ${{ github.repository == 'libfn/functional' && 'warp-windows-2025-vs2026-x64-8x' || 'windows-2025-vs2026' }}
 
     steps:
     - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1