diff --git a/.github/workflows/__all-platform-bundle.yml b/.github/workflows/__all-platform-bundle.yml
index a0272b3e4..5f2a6fa86 100644
--- a/.github/workflows/__all-platform-bundle.yml
+++ b/.github/workflows/__all-platform-bundle.yml
@@ -56,7 +56,7 @@ jobs:
         include:
           - os: ubuntu-26.04
             version: nightly-latest
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: nightly-latest
           - os: windows-2025
             version: nightly-latest
diff --git a/.github/workflows/__multi-language-autodetect.yml b/.github/workflows/__multi-language-autodetect.yml
index fd252d6de..b8a672858 100644
--- a/.github/workflows/__multi-language-autodetect.yml
+++ b/.github/workflows/__multi-language-autodetect.yml
@@ -68,27 +68,27 @@ jobs:
             version: stable-v2.22.4
           - os: ubuntu-26.04
             version: stable-v2.23.9
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: stable-v2.23.9
           - os: ubuntu-26.04
             version: stable-v2.24.3
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: stable-v2.24.3
           - os: ubuntu-26.04
             version: stable-v2.25.6
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: stable-v2.25.6
           - os: ubuntu-26.04
             version: default
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: default
           - os: ubuntu-26.04
             version: linked
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: linked
           - os: ubuntu-26.04
             version: nightly-latest
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: nightly-latest
     name: Multi-language repository
     if: github.triggering_actor != 'dependabot[bot]'
diff --git a/.github/workflows/__per-language-bundle-validation.yml b/.github/workflows/__per-language-bundle-validation.yml
index 177f4a0d8..cb6b1a773 100644
--- a/.github/workflows/__per-language-bundle-validation.yml
+++ b/.github/workflows/__per-language-bundle-validation.yml
@@ -68,7 +68,7 @@ jobs:
             os: ubuntu-26.04
             version: linked
           - language: swift
-            os: macos-latest-xlarge
+            os: macos-26-xlarge
             version: linked
             build-mode: autobuild
     name: Per-language bundles
diff --git a/.github/workflows/__swift-autobuild.yml b/.github/workflows/__swift-autobuild.yml
index 52c189f3a..4ba28f348 100644
--- a/.github/workflows/__swift-autobuild.yml
+++ b/.github/workflows/__swift-autobuild.yml
@@ -34,7 +34,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: nightly-latest
     name: Swift analysis using autobuild
     if: github.triggering_actor != 'dependabot[bot]'
diff --git a/.github/workflows/__swift-custom-build.yml b/.github/workflows/__swift-custom-build.yml
index 000b681eb..c38f0daa1 100644
--- a/.github/workflows/__swift-custom-build.yml
+++ b/.github/workflows/__swift-custom-build.yml
@@ -54,11 +54,11 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: linked
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: default
-          - os: macos-latest-xlarge
+          - os: macos-26-xlarge
             version: nightly-latest
     name: Swift analysis using a custom build command
     if: github.triggering_actor != 'dependabot[bot]'
diff --git a/pr-checks/checks/all-platform-bundle.yml b/pr-checks/checks/all-platform-bundle.yml
index a13ba7cde..24bd29015 100644
--- a/pr-checks/checks/all-platform-bundle.yml
+++ b/pr-checks/checks/all-platform-bundle.yml
@@ -3,7 +3,7 @@ description: "Tests using an all-platform CodeQL Bundle"
 operatingSystems:
   - ubuntu
   - os: macos
-    runner-image: macos-latest-xlarge
+    runner-image: macos-26-xlarge
   - windows
 versions:
   - nightly-latest
diff --git a/pr-checks/checks/multi-language-autodetect.yml b/pr-checks/checks/multi-language-autodetect.yml
index c826ac7ea..108dcd808 100644
--- a/pr-checks/checks/multi-language-autodetect.yml
+++ b/pr-checks/checks/multi-language-autodetect.yml
@@ -3,7 +3,7 @@ description: "An end-to-end integration test of a multi-language repository usin
 operatingSystems:
   - ubuntu
   - os: macos
-    runner-image: macos-latest-xlarge
+    runner-image: macos-26-xlarge
   # Older CodeQL CLI versions only support Swift up to 6.1, which requires Xcode 16. That is
   # not available on macOS 26, so run these versions on macOS 15 where we select Xcode 16
   # below. See https://github.com/actions/runner-images/issues/14167.
diff --git a/pr-checks/checks/per-language-bundle-validation.yml b/pr-checks/checks/per-language-bundle-validation.yml
index 942611d62..b84c15494 100644
--- a/pr-checks/checks/per-language-bundle-validation.yml
+++ b/pr-checks/checks/per-language-bundle-validation.yml
@@ -37,7 +37,7 @@ matrix:
       os: ubuntu-26.04
       version: linked
     - language: swift
-      os: macos-latest-xlarge
+      os: macos-26-xlarge
       version: linked
       build-mode: autobuild
 installNode: true
diff --git a/pr-checks/checks/swift-autobuild.yml b/pr-checks/checks/swift-autobuild.yml
index 393857cd2..8087e1aee 100644
--- a/pr-checks/checks/swift-autobuild.yml
+++ b/pr-checks/checks/swift-autobuild.yml
@@ -4,7 +4,7 @@ versions:
   - nightly-latest
 operatingSystems:
   - os: macos
-    runner-image: macos-latest-xlarge
+    runner-image: macos-26-xlarge
 steps:
   - uses: ./../action/init
     id: init
diff --git a/pr-checks/checks/swift-custom-build.yml b/pr-checks/checks/swift-custom-build.yml
index 53131b1ae..a10c0a6ed 100644
--- a/pr-checks/checks/swift-custom-build.yml
+++ b/pr-checks/checks/swift-custom-build.yml
@@ -6,7 +6,7 @@ versions:
   - nightly-latest
 operatingSystems:
   - os: macos
-    runner-image: macos-latest-xlarge
+    runner-image: macos-26-xlarge
 installGo: true
 installDotNet: true
 env: