diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4d75643..46053c6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,12 +16,15 @@ concurrency:
 jobs:
   macos-unit-tests:
     name: macOS Build & Test
-    runs-on: macos-26
+    runs-on: xcode-27
 
     steps:
       - name: Checkout
         uses: actions/checkout@v7
 
+      - name: Install Metal toolchain
+        run: xcodebuild -downloadComponent MetalToolchain
+
       - name: Run unit tests (macOS)
         run: |
           xcodebuild test \
@@ -43,12 +46,15 @@ jobs:
 
   ios-build:
     name: iOS Build
-    runs-on: macos-26
+    runs-on: xcode-27
 
     steps:
       - name: Checkout
         uses: actions/checkout@v7
 
+      - name: Install Metal toolchain
+        run: xcodebuild -downloadComponent MetalToolchain
+
       - name: Build app (iOS Simulator)
         run: |
           xcodebuild build \
@@ -62,12 +68,15 @@ jobs:
 
   mas-build:
     name: Mac App Store Build
-    runs-on: macos-26
+    runs-on: xcode-27
 
     steps:
       - name: Checkout
         uses: actions/checkout@v7
 
+      - name: Install Metal toolchain
+        run: xcodebuild -downloadComponent MetalToolchain
+
       # Keeps the Sparkle-free target compiling: this build has no Sparkle
       # package linked, so every canImport(Sparkle) guard must hold.
       - name: Build app (Mac App Store target)
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e0442ce..2ea8ff3 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,12 +10,15 @@ permissions:
 
 jobs:
   release:
-    runs-on: macos-26
+    runs-on: xcode-27
 
     steps:
       - name: Checkout
         uses: actions/checkout@v7
 
+      - name: Install Metal toolchain
+        run: xcodebuild -downloadComponent MetalToolchain
+
       - name: Validate release version
         env:
           RELEASE_TAG: ${{ github.ref_name }}