diff --git a/.github/actionlint.yaml b/.github/actionlint.yaml
new file mode 100644
index 0000000000000..1987681088a3b
--- /dev/null
+++ b/.github/actionlint.yaml
@@ -0,0 +1,5 @@
+# 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
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index d75cc99eaf920..c09f656caf30d 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -78,7 +78,7 @@ 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
index ee60975b39a0d..f0660ba26bffc 100644
--- a/.github/workflows/end-to-end-tests.yml
+++ b/.github/workflows/end-to-end-tests.yml
@@ -85,7 +85,7 @@ 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/javascript-tests.yml b/.github/workflows/javascript-tests.yml
index 933bfcd5f8313..11552c784ebc3 100644
--- a/.github/workflows/javascript-tests.yml
+++ b/.github/workflows/javascript-tests.yml
@@ -73,7 +73,7 @@ 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
index 940b48e25ae0a..a72cd78740250 100644
--- a/.github/workflows/javascript-type-checking.yml
+++ b/.github/workflows/javascript-type-checking.yml
@@ -66,7 +66,7 @@ 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
index a6aa2bae00803..c883802bef40c 100644
--- a/.github/workflows/local-docker-environment.yml
+++ b/.github/workflows/local-docker-environment.yml
@@ -93,7 +93,7 @@ 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 ) }}
@@ -138,7 +138,7 @@ 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
index f9c86e7aaefae..490855c45be54 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -49,7 +49,7 @@ permissions: {}
 jobs:
   determine-matrix:
     name: Determine Matrix
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     if: ${{ ( github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' ) && ! contains( github.event.before, '00000000' ) }}
     permissions:
       actions: read
@@ -146,7 +146,7 @@ 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
index 78f23bbcfe76d..c2f1a95d9d165 100644
--- a/.github/workflows/php-compatibility.yml
+++ b/.github/workflows/php-compatibility.yml
@@ -62,7 +62,7 @@ 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-static-analysis.yml b/.github/workflows/phpstan-static-analysis.yml
index 352b78e4c8f43..d8e2588b5ad15 100644
--- a/.github/workflows/phpstan-static-analysis.yml
+++ b/.github/workflows/phpstan-static-analysis.yml
@@ -62,7 +62,7 @@ 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
index e63281f59af46..5f288b1a830bd 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -99,7 +99,7 @@ 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' ]
@@ -127,14 +127,14 @@ 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'
@@ -142,14 +142,14 @@ jobs:
             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'
@@ -157,7 +157,7 @@ jobs:
             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'
@@ -199,7 +199,7 @@ 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' ]
@@ -228,13 +228,13 @@ jobs:
 
         include:
         # Include jobs that test with memcached.
-        - os: ubuntu-24.04
+        - os: ubuntu-26.04
           php: '8.3'
           db-type: 'mariadb'
           db-version: '11.8'
           multisite: false
           memcached: true
-        - os: ubuntu-24.04
+        - os: ubuntu-26.04
           php: '8.3'
           db-type: 'mariadb'
           db-version: '11.8'
@@ -276,7 +276,7 @@ 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: [ '12.1' ]
@@ -432,7 +432,7 @@ 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
index 38acc07113c2c..07394f3141785 100644
--- 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
index 8dff8e1c1fcce..f205c6934aa03 100644
--- a/.github/workflows/pull-request-comments.yml
+++ b/.github/workflows/pull-request-comments.yml
@@ -23,7 +23,7 @@ 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
@@ -126,7 +126,7 @@ 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/test-build-processes.yml b/.github/workflows/test-build-processes.yml
index 64f6c63481914..3bc4dadff2084 100644
--- a/.github/workflows/test-build-processes.yml
+++ b/.github/workflows/test-build-processes.yml
@@ -55,12 +55,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'ubuntu-24.04' ]
+        os: [ 'ubuntu-26.04' ]
         directory: [ 'src', 'build' ]
         test-certificates: [ true ]
         include:
           # Only prepare artifacts for Playground once.
-          - os: 'ubuntu-24.04'
+          - os: 'ubuntu-26.04'
             directory: 'build'
             save-build: true
             prepare-playground: ${{ github.event_name == 'pull_request' && true || '' }}
@@ -114,7 +114,7 @@ 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/upgrade-develop-testing.yml b/.github/workflows/upgrade-develop-testing.yml
index 3a9a8ec6285bf..48a5a35081473 100644
--- a/.github/workflows/upgrade-develop-testing.yml
+++ b/.github/workflows/upgrade-develop-testing.yml
@@ -67,7 +67,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'ubuntu-24.04' ]
+        os: [ 'ubuntu-26.04' ]
         php: [ '7.4', '8.4' ]
         db-type: [ 'mysql' ]
         db-version: [ '5.7', '8.4' ]
@@ -94,7 +94,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'ubuntu-24.04' ]
+        os: [ 'ubuntu-26.04' ]
         php: [ '7.4', '8.4' ]
         db-type: [ 'mysql' ]
         db-version: [ '8.4' ]
@@ -127,7 +127,7 @@ 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/workflow-lint.yml b/.github/workflows/workflow-lint.yml
index d86b62ca79646..86429d5778bda 100644
--- a/.github/workflows/workflow-lint.yml
+++ b/.github/workflows/workflow-lint.yml
@@ -57,7 +57,7 @@ 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/package-lock.json b/package-lock.json
index 20cfb2112df8f..e42a6d2ff4a02 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,7 +41,7 @@
 			},
 			"devDependencies": {
 				"@lodder/grunt-postcss": "^3.1.1",
-				"@playwright/test": "1.61.1",
+				"@playwright/test": "1.64.1",
 				"@pmmmwh/react-refresh-webpack-plugin": "0.6.2",
 				"@types/codemirror": "5.60.17",
 				"@types/espree": "10.1.0",
@@ -4590,19 +4590,19 @@
 			}
 		},
 		"node_modules/@playwright/test": {
-			"version": "1.61.1",
-			"resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.61.1.tgz",
-			"integrity": "sha512-8nKv6+0RJSL9FE4jYOEGXnPeM/Hg12qZpmqzZjRh3qM0Y7c3z1mrOTfFLids72RDQYVh9WpLEfR5WdpNX4fkig==",
+			"version": "1.64.1",
+			"resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.64.1.tgz",
+			"integrity": "sha512-IaYGml/nSOiZWROfPtuIL7neuu9qDOZ3TNvNljUIrhDMxiGTgPjzj/g9p9RxpS2tSepPDRY+UwAaEeiKtUvIAg==",
 			"dev": true,
 			"license": "Apache-2.0",
 			"dependencies": {
-				"playwright": "1.61.1"
+				"playwright": "1.64.1"
 			},
 			"bin": {
 				"playwright": "cli.js"
 			},
 			"engines": {
-				"node": ">=18"
+				"node": ">=20"
 			}
 		},
 		"node_modules/@pmmmwh/react-refresh-webpack-plugin": {
@@ -26354,35 +26354,32 @@
 			}
 		},
 		"node_modules/playwright": {
-			"version": "1.61.1",
-			"resolved": "https://registry.npmjs.org/playwright/-/playwright-1.61.1.tgz",
-			"integrity": "sha512-DWnY5o3YbLWK4GovuAVwpqL+1VwGNdUGrRr++8j8PtQQzvAVZUIMjKQ90fY689sEJZJBbZVw1rXaOKSTitkzPQ==",
+			"version": "1.64.1",
+			"resolved": "https://registry.npmjs.org/playwright/-/playwright-1.64.1.tgz",
+			"integrity": "sha512-HCrVhHr5QQuwYoswEUGTb7gGp522yflbv/ST8nF4sFWGuLjQCt17Q/EubpGGSNKYn1tsTCPZxqHhHCfVURu7UA==",
 			"dev": true,
 			"license": "Apache-2.0",
 			"dependencies": {
-				"playwright-core": "1.61.1"
+				"playwright-core": "1.64.1"
 			},
 			"bin": {
 				"playwright": "cli.js"
 			},
 			"engines": {
-				"node": ">=18"
-			},
-			"optionalDependencies": {
-				"fsevents": "2.3.2"
+				"node": ">=20"
 			}
 		},
 		"node_modules/playwright-core": {
-			"version": "1.61.1",
-			"resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.61.1.tgz",
-			"integrity": "sha512-h7Qlt6m4REp25qvIdvbDtVmD4LqVXfpRxhORv9L0jzETM05p4fuPJ3dKyuSXQxDSbXnmS79HAgi9589lGSpLkg==",
+			"version": "1.64.1",
+			"resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.64.1.tgz",
+			"integrity": "sha512-BC4s8y6SEVA6Q1rSxZTto8hI1KUI3xXlHGZgvGqP4IqPdI/a6FX9H29IDNz7vKo9l21b6LfYosScPL6M3xxyDQ==",
 			"dev": true,
 			"license": "Apache-2.0",
 			"bin": {
 				"playwright-core": "cli.js"
 			},
 			"engines": {
-				"node": ">=18"
+				"node": ">=20"
 			}
 		},
 		"node_modules/plur": {
diff --git a/package.json b/package.json
index 396ec6a509336..0b2f069ed0ce9 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
 	],
 	"devDependencies": {
 		"@lodder/grunt-postcss": "^3.1.1",
-		"@playwright/test": "1.61.1",
+		"@playwright/test": "1.64.1",
 		"@pmmmwh/react-refresh-webpack-plugin": "0.6.2",
 		"@types/codemirror": "5.60.17",
 		"@types/espree": "10.1.0",