diff --git a/.github/workflows/_build-packages.yml b/.github/workflows/_build-packages.yml
index 5a780c1d33854..b3e2a5e042b16 100644
--- a/.github/workflows/_build-packages.yml
+++ b/.github/workflows/_build-packages.yml
@@ -20,7 +20,7 @@ defaults:
 
 jobs:
   build-packages:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         pkg-name: ${{ fromJSON(inputs.pkg-names) }}
@@ -49,7 +49,7 @@ jobs:
 
   merge-artifacts:
     needs: build-packages
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with: # download all build artifacts
diff --git a/.github/workflows/_legacy-checkpoints.yml b/.github/workflows/_legacy-checkpoints.yml
index 1b893005a91f1..5e8b9e9d4c118 100644
--- a/.github/workflows/_legacy-checkpoints.yml
+++ b/.github/workflows/_legacy-checkpoints.yml
@@ -53,7 +53,7 @@ defaults:
 
 jobs:
   create-legacy-ckpts:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     outputs:
       pl-version: ${{ steps.decide-version.outputs.pl-version }}
     steps:
@@ -138,7 +138,7 @@ jobs:
           aws s3 cp $AWS_RUN checkpoints.zip s3://pl-public-data/legacy/ --acl public-read
 
   add-ckpt-test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     if: inputs.create_pr
     needs: create-legacy-ckpts
     env:
diff --git a/.github/workflows/ci-pkg-install.yml b/.github/workflows/ci-pkg-install.yml
index 62ef2737bc9c9..8bd8af101a0e7 100644
--- a/.github/workflows/ci-pkg-install.yml
+++ b/.github/workflows/ci-pkg-install.yml
@@ -42,7 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-22.04", "macOS-14", "windows-2022"]
+        os: ["ubuntu-24.04", "macos-26", "windows-2025"]
         pkg-name: ["fabric", "pytorch", "lightning", "notset"]
         python-version: ["3.10", "3.11"]
     env:
diff --git a/.github/workflows/ci-tests-fabric.yml b/.github/workflows/ci-tests-fabric.yml
index 1f55b944d8f64..ddf0816307eba 100644
--- a/.github/workflows/ci-tests-fabric.yml
+++ b/.github/workflows/ci-tests-fabric.yml
@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macOS-14, ubuntu-22.04, windows-2022]
+        os: [macos-26, ubuntu-24.04, windows-2025]
         config:
           # Test unified "lightning" package at the oldest supported and the latest PyTorch
           - { pkg-name: "lightning", python-version: "3.10", pytorch-version: "2.6" }
@@ -68,7 +68,7 @@ jobs:
       FREEZE_REQUIREMENTS: ${{ ! (github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/release/')) }}
       TORCH_URL_STABLE: "https://download.pytorch.org/whl/cpu/"
       # TODO: Remove this - Enable running MPS tests on this platform
-      DISABLE_MPS: ${{ matrix.os == 'macOS-14' && '1' || '0' }}
+      DISABLE_MPS: ${{ startsWith(matrix.os, 'macos') && '1' || '0' }}
       UV_TORCH_BACKEND: "cpu"
       # Supply-chain guard: skip PyPI releases newer than this. See https://docs.astral.sh/uv/reference/settings/#exclude-newer
       UV_EXCLUDE_NEWER: "2 days"
@@ -154,9 +154,12 @@ jobs:
       - name: Testing Fabric
         working-directory: tests/tests_fabric
         # NOTE: do not include coverage report here, see: https://github.com/nedbat/coveragepy/issues/1003
+        # On macOS 15+ runners, Local Network Privacy blocks mDNS for non-root processes, so every
+        # hostname/reverse-DNS lookup (e.g. torch's TCPStore connect) stalls ~35s; root is exempt.
+        # See https://github.com/actions/runner-images/issues/14568 and https://github.com/actions/runner-images/issues/10924
         run: |
           echo $GITHUB_RUN_ID
-          python -m coverage run --source ${{ env.COVERAGE_SCOPE }} \
+          ${{ runner.os == 'macOS' && 'sudo -E env "PATH=$PATH"' || '' }} python -m coverage run --source ${{ env.COVERAGE_SCOPE }} \
             -m pytest -v --timeout=60 --durations=50 --random-order-seed=$GITHUB_RUN_ID \
             --junitxml=junit.xml -o junit_family=legacy  # NOTE: for Codecov's test results
 
diff --git a/.github/workflows/ci-tests-pytorch.yml b/.github/workflows/ci-tests-pytorch.yml
index 4d91f6a56c860..5021ccc67eede 100644
--- a/.github/workflows/ci-tests-pytorch.yml
+++ b/.github/workflows/ci-tests-pytorch.yml
@@ -42,7 +42,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macOS-14, ubuntu-22.04, windows-2022]
+        # Runner images: https://github.com/actions/runner-images
+        os: [macos-26, ubuntu-24.04, windows-2025]
         config:
           # Test unified "lightning" package at the oldest supported and the latest PyTorch
           - { pkg-name: "lightning", python-version: "3.10", pytorch-version: "2.6" }
@@ -72,7 +73,7 @@ jobs:
       TORCH_URL: "https://download.pytorch.org/whl/cpu/"
       FREEZE_REQUIREMENTS: ${{ ! (github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/release/')) }}
       # TODO: Remove this - Enable running MPS tests on this platform
-      DISABLE_MPS: ${{ matrix.os == 'macOS-14' && '1' || '0' }}
+      DISABLE_MPS: ${{ startsWith(matrix.os, 'macos') && '1' || '0' }}
       UV_TORCH_BACKEND: "cpu"
       # Supply-chain guard: skip PyPI releases newer than this. See https://docs.astral.sh/uv/reference/settings/#exclude-newer
       UV_EXCLUDE_NEWER: "2 days"
@@ -184,9 +185,12 @@ jobs:
       - name: Testing PyTorch
         working-directory: tests/tests_pytorch
         # NOTE: do not include coverage report here, see: https://github.com/nedbat/coveragepy/issues/1003
+        # On macOS 15+ runners, Local Network Privacy blocks mDNS for non-root processes, so every
+        # hostname/reverse-DNS lookup (e.g. torch's TCPStore connect) stalls ~35s; root is exempt.
+        # See https://github.com/actions/runner-images/issues/14568 and https://github.com/actions/runner-images/issues/10924
         run: |
           echo $GITHUB_RUN_ID
-          python -m coverage run --source ${{ env.COVERAGE_SCOPE }} \
+          ${{ runner.os == 'macOS' && 'sudo -E env "PATH=$PATH"' || '' }} python -m coverage run --source ${{ env.COVERAGE_SCOPE }} \
             -m pytest . -v --timeout=90 --durations=50 --random-order-seed=$GITHUB_RUN_ID \
             --junitxml=junit.xml -o junit_family=legacy  # NOTE: for Codecov's test results
 
diff --git a/.github/workflows/code-checks.yml b/.github/workflows/code-checks.yml
index dc172bd0c48b1..59449f25778cf 100644
--- a/.github/workflows/code-checks.yml
+++ b/.github/workflows/code-checks.yml
@@ -26,7 +26,7 @@ defaults:
 
 jobs:
   mypy:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
       UV_TORCH_BACKEND: "cpu"
       # Supply-chain guard: skip PyPI releases newer than this. See https://docs.astral.sh/uv/reference/settings/#exclude-newer
diff --git a/.github/workflows/docs-build.yml b/.github/workflows/docs-build.yml
index 022a970f171a4..e4c754dc454a5 100644
--- a/.github/workflows/docs-build.yml
+++ b/.github/workflows/docs-build.yml
@@ -54,7 +54,7 @@ env:
 jobs:
   docs-make:
     if: github.event.pull_request.draft == false
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
@@ -151,7 +151,7 @@ jobs:
   deploy-docs:
     needs: docs-make
     if: github.repository_owner == 'Lightning-AI' && github.event_name != 'pull_request'
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
diff --git a/.github/workflows/docs-tutorials.yml b/.github/workflows/docs-tutorials.yml
index 517fc0116c011..856c4bc872c29 100644
--- a/.github/workflows/docs-tutorials.yml
+++ b/.github/workflows/docs-tutorials.yml
@@ -16,7 +16,7 @@ defaults:
 
 jobs:
   docs-update:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index dfa0dbdcdbdd7..561b799c44427 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -18,7 +18,7 @@ defaults:
 
 jobs:
   build-packages:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
       PKG_NAME: "lightning"
       # Supply-chain guard: skip PyPI releases newer than this (ISO 8601 duration). See https://pip.pypa.io/en/stable/cli/pip_install/#cmdoption-uploaded-prior-to
diff --git a/.github/workflows/release-pkg.yml b/.github/workflows/release-pkg.yml
index e04be38241082..9f2e84cd58763 100644
--- a/.github/workflows/release-pkg.yml
+++ b/.github/workflows/release-pkg.yml
@@ -32,7 +32,7 @@ jobs:
       artifact-name: dist-packages-${{ github.sha }}
 
   upload-packages:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs: build-packages
     if: github.event_name == 'release'
     steps:
@@ -49,7 +49,7 @@ jobs:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
 
   release-version:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     outputs:
       tag: ${{ steps.lai-package.outputs.version }}
     steps:
@@ -66,7 +66,7 @@ jobs:
         run: python -c "import lightning ; print(f'version={lightning.__version__}')" >> $GITHUB_OUTPUT
 
   signaling:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs: ["release-version", "build-packages"]
     if: startsWith(github.event.ref, 'refs/tags') || github.event_name == 'release'
     env:
@@ -130,7 +130,7 @@ jobs:
             borda
 
   publish-packages:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs: [build-packages]
     if: startsWith(github.event.ref, 'refs/tags') || github.event_name == 'release'
     permissions:
diff --git a/docs/source-pytorch/common/hooks.rst b/docs/source-pytorch/common/hooks.rst
index 73b05f7765e53..90a1351e7d37f 100644
--- a/docs/source-pytorch/common/hooks.rst
+++ b/docs/source-pytorch/common/hooks.rst
@@ -59,7 +59,7 @@ important to understand. The following order is always used:
     ...
     Callback: Training is starting!
     Model: Training is starting!
-    Epoch 0/0  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 64/64 ...
+    Epoch 0/0 ...
 
 
 .. note::