desrosj · Nov 5, 2026
diff --git a/.github/actionlint.yaml b/.github/actionlint.yaml
@@ -1,3 +1,9 @@
+# actionlint does not recognize the `ubuntu-26.04` GitHub-hosted runner label yet.
+# This can be removed once the pinned actionlint version includes it in its list of known labels.
+self-hosted-runner:
+  labels:
+    - ubuntu-26.04
+
 # actionlint does not support the `$/` self-repository `uses:` syntax yet.
 # See https://github.com/rhysd/actionlint/issues/711.
 paths:

diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
@@ -133,7 +133,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ phpcs, jshint, slack-notifications ]

diff --git a/.github/workflows/end-to-end-tests.yml b/.github/workflows/end-to-end-tests.yml
@@ -109,7 +109,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ e2e-tests, slack-notifications ]

diff --git a/.github/workflows/failed-workflow.yml b/.github/workflows/failed-workflow.yml
@@ -23,7 +23,7 @@ jobs:
   # - Restarts all failed jobs when the workflow fails or is cancelled for the first time.
   failed-workflow:
     name: Rerun a workflow
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     timeout-minutes: 30

diff --git a/.github/workflows/install-testing.yml b/.github/workflows/install-testing.yml
@@ -82,7 +82,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04 ]
+        os: [ ubuntu-26.04 ]
         php: ${{ fromJSON( needs.build-test-matrix.outputs.php-versions ) }}
         db-type: [ 'mysql' ]
         db-version: ${{ fromJSON( needs.build-test-matrix.outputs.mysql-versions ) }}
@@ -200,7 +200,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/javascript-tests.yml b/.github/workflows/javascript-tests.yml
@@ -119,7 +119,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/javascript-type-checking.yml b/.github/workflows/javascript-type-checking.yml
@@ -74,7 +74,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/local-docker-environment.yml b/.github/workflows/local-docker-environment.yml
@@ -97,7 +97,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04 ]
+        os: [ ubuntu-26.04 ]
         memcached: [ false, true ]
         php: ${{ fromJSON( needs.build-test-matrix.outputs.php-versions ) }}
         db-version: ${{ fromJSON( needs.build-test-matrix.outputs.mysql-versions ) }}
@@ -143,7 +143,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ build-test-matrix, environment-tests-mysql, slack-notifications ]

diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
@@ -65,7 +65,7 @@ permissions: {}
 jobs:
   determine-matrix:
     name: Determine Matrix
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     if: |
       (
         github.repository == 'WordPress/wordpress-develop' || (
@@ -172,7 +172,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/php-compatibility.yml b/.github/workflows/php-compatibility.yml
@@ -107,7 +107,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/phpstan-pull-request-comments.yml b/.github/workflows/phpstan-pull-request-comments.yml
@@ -32,7 +32,7 @@ jobs:
   # - Creates or updates the comment while there are errors, and marks it as resolved once there are none.
   phpstan-results:
     name: Comment on a pull request with PHPStan results
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: read
       issues: write

diff --git a/.github/workflows/phpstan-static-analysis.yml b/.github/workflows/phpstan-static-analysis.yml
@@ -69,7 +69,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
@@ -87,7 +87,7 @@ jobs:
   # Reduce PR testing only for audited Core assets and unrelated companion files.
   select-test-coverage:
     name: Select PHPUnit coverage
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 5
     permissions:
       contents: read
@@ -212,7 +212,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04 ]
+        os: [ ubuntu-26.04 ]
         php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
         db-type: [ 'mysql' ]
         db-version: [ '5.7', '8.0', '8.4', '9.7' ]
@@ -240,37 +240,37 @@ jobs:
 
         include:
           # Include jobs that test with memcached.
-          - os: ubuntu-24.04
+          - os: ubuntu-26.04
             php: '8.3'
             db-type: 'mysql'
             db-version: '8.4'
             tests-domain: 'example.org'
             multisite: false
             memcached: true
-          - os: ubuntu-24.04
+          - os: ubuntu-26.04
             php: '8.3'
             db-type: 'mysql'
             db-version: '8.4'
             tests-domain: 'example.org'
             multisite: true
             memcached: true
           # Include jobs with a port on the test domain for both single and multisite.
-          - os: ubuntu-24.04
+          - os: ubuntu-26.04
             php: '8.4'
             db-type: 'mysql'
             db-version: '8.4'
             tests-domain: 'example.org:8889'
             multisite: false
             memcached: false
-          - os: ubuntu-24.04
+          - os: ubuntu-26.04
             php: '8.4'
             db-type: 'mysql'
             db-version: '8.4'
             tests-domain: 'example.org:8889'
             multisite: true
             memcached: false
           # Report test results to the Host Test Results.
-          - os: ubuntu-24.04
+          - os: ubuntu-26.04
             db-type: 'mysql'
             db-version: '8.4'
             tests-domain: 'example.org'
@@ -322,7 +322,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04 ]
+        os: [ ubuntu-26.04 ]
         php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
         db-type: [ 'mariadb' ]
         db-version: [ '5.5', '10.3', '10.5', '10.6', '10.11', '11.4', '11.8', '12.3' ]
@@ -351,13 +351,13 @@ jobs:
 
         include:
         # Include jobs that test with memcached.
-        - os: ubuntu-24.04
+        - os: ubuntu-26.04
           php: '8.3'
           db-type: 'mariadb'
           db-version: '12.3'
           multisite: false
           memcached: true
-        - os: ubuntu-24.04
+        - os: ubuntu-26.04
           php: '8.3'
           db-type: 'mariadb'
           db-version: '12.3'
@@ -407,7 +407,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04 ]
+        os: [ ubuntu-26.04 ]
         php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
         db-type: [ 'mysql', 'mariadb' ]
         db-version: [ '26.10', '13.0' ]
@@ -626,7 +626,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]

diff --git a/.github/workflows/props-bot.yml b/.github/workflows/props-bot.yml
@@ -48,7 +48,7 @@ jobs:
   # - Removes the props-bot label, if necessary.
   props-bot:
     name: Generate a list of props
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       # The action needs permission `write` permission for PRs in order to add a comment.
       pull-requests: write

diff --git a/.github/workflows/pull-request-comments.yml b/.github/workflows/pull-request-comments.yml
@@ -23,7 +23,7 @@ jobs:
   # Comments on a pull request when the author is a first time contributor.
   post-welcome-message:
     name: Post a welcome comment for first-time contributors
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       issues: write
       pull-requests: write
@@ -115,7 +115,7 @@ jobs:
   # Leaves a comment on a pull request with a link to test the changes in a WordPress Playground instance.
   playground-details:
     name: Comment on a pull request with Playground details
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       issues: write
       pull-requests: write
@@ -219,7 +219,7 @@ jobs:
   # Manages comments reminding contributors to include a Trac ticket link when opening a pull request.
   trac-ticket-check:
     name: Manage Trac ticket reminders for pull requests
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       issues: write
       pull-requests: write

diff --git a/.github/workflows/reusable-build-package.yml b/.github/workflows/reusable-build-package.yml
@@ -26,7 +26,7 @@ jobs:
     name: WordPress
     permissions:
       contents: read
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 20
 
     steps:

diff --git a/.github/workflows/reusable-cleanup-pull-requests.yml b/.github/workflows/reusable-cleanup-pull-requests.yml
@@ -24,7 +24,7 @@ jobs:
 # - Comments on pull requests referencing any fixed tickets before closing.
   close-prs:
     name: Find and close PRs
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       pull-requests: write
 

diff --git a/.github/workflows/reusable-coding-standards-javascript.yml b/.github/workflows/reusable-coding-standards-javascript.yml
@@ -29,7 +29,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   jshint:
     name: JavaScript checks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 20

diff --git a/.github/workflows/reusable-coding-standards-php.yml b/.github/workflows/reusable-coding-standards-php.yml
@@ -42,7 +42,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   phpcs:
     name: PHP checks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 20

diff --git a/.github/workflows/reusable-end-to-end-tests.yml b/.github/workflows/reusable-end-to-end-tests.yml
@@ -68,7 +68,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   e2e-tests:
     name: ${{ inputs.test-group && format( '{0}, ', inputs.test-group ) || '' }}SCRIPT_DEBUG ${{ inputs.LOCAL_SCRIPT_DEBUG && 'enabled' || 'disabled' }}
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 20

diff --git a/.github/workflows/reusable-javascript-tests.yml b/.github/workflows/reusable-javascript-tests.yml
@@ -30,7 +30,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   test-js:
     name: Run QUnit tests
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 20
@@ -62,7 +62,7 @@ jobs:
       - name: Install npm Dependencies
         run: npm ci
 
-      # Branches prior to 6.1 using outdated versions of Puppeteer fail on newer versions of the `ubuntu-24` image.
+      # Branches prior to 6.1 using outdated versions of Puppeteer fail on the `ubuntu-24.04` image and newer.
       # This disables AppArmor in order to work around those failures.
       #
       # See https://issues.chromium.org/issues/373753919

diff --git a/.github/workflows/reusable-javascript-type-checking-v1.yml b/.github/workflows/reusable-javascript-type-checking-v1.yml
@@ -28,7 +28,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   typecheck:
     name: Run JavaScript type checking
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 10

diff --git a/.github/workflows/reusable-performance-report-v2.yml b/.github/workflows/reusable-performance-report-v2.yml
@@ -51,7 +51,7 @@ jobs:
   # - Publish performance results if necessary.
   compare:
     name: ${{ inputs.multisite && 'Multisite' || 'Single Site' }} ${{ inputs.memcached && 'Memcached' || 'Default' }} ${{ inputs.publish && '(Publishes)' || '' }}
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
 

diff --git a/.github/workflows/reusable-performance-test-v2.yml b/.github/workflows/reusable-performance-test-v2.yml
@@ -107,7 +107,7 @@ jobs:
   # - Ensure version-controlled files are not modified or deleted.
   performance:
     name: Test ${{ inputs.subject == 'base' && inputs.BASE_TAG || inputs.subject }}
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
 

diff --git a/.github/workflows/reusable-php-compatibility.yml b/.github/workflows/reusable-php-compatibility.yml
@@ -35,7 +35,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   php-compatibility:
     name: Run compatibility checks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 20

diff --git a/.github/workflows/reusable-phpstan-static-analysis-v1.yml b/.github/workflows/reusable-phpstan-static-analysis-v1.yml
@@ -40,7 +40,7 @@ jobs:
   # - Ensures version-controlled files are not modified or deleted.
   phpstan:
     name: Run PHP static analysis
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
     timeout-minutes: 20

diff --git a/.github/workflows/reusable-phpunit-tests-v1.yml b/.github/workflows/reusable-phpunit-tests-v1.yml
@@ -14,7 +14,7 @@ on:
         description: 'Operating system to run tests on'
         required: false
         type: 'string'
-        default: 'ubuntu-24.04'
+        default: 'ubuntu-26.04'
       repository:
         description: 'The repository to check out and test. Defaults to the repository calling this workflow.'
         required: false