diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 7897ce4114c13..1ce9043dfeb99 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/end-to-end-tests.yml b/.github/workflows/end-to-end-tests.yml
index c16be231577b9..81c65201dec89 100644
--- a/.github/workflows/end-to-end-tests.yml
+++ b/.github/workflows/end-to-end-tests.yml
@@ -64,7 +64,7 @@ jobs:
 
   failed-workflow:
     name: Failed workflow tasks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: write
     needs: [ e2e-tests ]
diff --git a/.github/workflows/javascript-tests.yml b/.github/workflows/javascript-tests.yml
index d3899a2839fcb..e5cf2c6c870c4 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: [ 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 a196f2d83c191..fb3950447c52e 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
@@ -93,7 +93,7 @@ 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 ]