diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 27558283d74ff..b15dbd6a3db81 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -77,7 +77,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ phpcs, jshint, slack-notifications ]
diff --git a/.github/workflows/javascript-tests.yml b/.github/workflows/javascript-tests.yml
index 06c9a749ca3ff..41b63ed41f130 100644
--- a/.github/workflows/javascript-tests.yml
+++ b/.github/workflows/javascript-tests.yml
@@ -67,7 +67,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ test-js, slack-notifications ]
diff --git a/.github/workflows/php-compatibility.yml b/.github/workflows/php-compatibility.yml
index b4e39508f6216..596aaedbfb779 100644
--- a/.github/workflows/php-compatibility.yml
+++ b/.github/workflows/php-compatibility.yml
@@ -63,7 +63,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ php-compatibility, slack-notifications ]
diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
index eb4dd98ad2cf4..7e3b91125a749 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest ]
+        os: [ ubuntu-26.04 ]
         php: [ '5.6', '7.0', '7.4', '8.0' ]
         multisite: [ false, true ]
         split_slow: [ false ]
@@ -47,23 +47,23 @@ jobs:
         include:
           # Additional "slow" jobs for PHP 5.6.
           - php: '5.6'
-            os: ubuntu-latest
+            os: ubuntu-26.04
             memcached: false
             multisite: false
             split_slow: true
           - php: '5.6'
-            os: ubuntu-latest
+            os: ubuntu-26.04
             memcached: false
             multisite: true
             split_slow: true
           # Include jobs for PHP 7.4 with memcached.
           - php: '7.4'
-            os: ubuntu-latest
+            os: ubuntu-26.04
             memcached: true
             multisite: false
             split_slow: false
           - php: '7.4'
-            os: ubuntu-latest
+            os: ubuntu-26.04
             memcached: true
             multisite: true
             split_slow: false
@@ -94,7 +94,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]
diff --git a/.github/workflows/test-build-processes.yml b/.github/workflows/test-build-processes.yml
index bd1527c0a7326..8bbd823d24fb4 100644
--- a/.github/workflows/test-build-processes.yml
+++ b/.github/workflows/test-build-processes.yml
@@ -45,11 +45,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, windows-latest ]
+        os: [ ubuntu-26.04, windows-2025 ]
         directory: [ 'src', 'build' ]
         include:
           # Only prepare artifacts once.
-          - os: ubuntu-latest
+          - os: ubuntu-26.04
             directory: 'build'
             prepare-playground: true
     with:
@@ -100,7 +100,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ slack-notifications ]