diff --git a/.github/workflows/biome.yml b/.github/workflows/biome.yml
index 88744f16ca..fea9c9c8bd 100644
--- a/.github/workflows/biome.yml
+++ b/.github/workflows/biome.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Setup Biome
       uses: biomejs/setup-biome@v2
       with:
diff --git a/.github/workflows/code_formatting.yml b/.github/workflows/code_formatting.yml
index 9f30f048cf..5669779946 100644
--- a/.github/workflows/code_formatting.yml
+++ b/.github/workflows/code_formatting.yml
@@ -10,7 +10,7 @@ jobs:
   code-formatting:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v5
     - name: Install packages
       run: source tools/ci.sh && ci_c_code_formatting_setup
diff --git a/.github/workflows/code_size.yml b/.github/workflows/code_size.yml
index 6726193379..8587ef0179 100644
--- a/.github/workflows/code_size.yml
+++ b/.github/workflows/code_size.yml
@@ -25,7 +25,7 @@ jobs:
   build:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 100
     - name: Install packages
diff --git a/.github/workflows/codespell.yml b/.github/workflows/codespell.yml
index 1d6b1dc9d2..688134b425 100644
--- a/.github/workflows/codespell.yml
+++ b/.github/workflows/codespell.yml
@@ -6,7 +6,7 @@ jobs:
   codespell:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     # codespell version should be kept in sync with .pre-commit-config.yml
     - run: pip install --user codespell==2.4.1 tomli
     - run: codespell
diff --git a/.github/workflows/commit_formatting.yml b/.github/workflows/commit_formatting.yml
index fcbcaa7092..2e1def95c3 100644
--- a/.github/workflows/commit_formatting.yml
+++ b/.github/workflows/commit_formatting.yml
@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 100
     - uses: actions/setup-python@v5
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index d01a4b50c9..465b1feeff 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v5
     - name: Install Python packages
       run: pip install -r docs/requirements.txt
diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index 6613f10662..d16122b720 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -18,7 +18,7 @@ jobs:
   embedding:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build
       run: make -C examples/embedding -f micropython_embed.mk && make -C examples/embedding
     - name: Run
diff --git a/.github/workflows/mpremote.yml b/.github/workflows/mpremote.yml
index ee91b6360b..359d888286 100644
--- a/.github/workflows/mpremote.yml
+++ b/.github/workflows/mpremote.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         # Setting this to zero means fetch all history and tags,
         # which hatch-vcs can use to discover the version tag.
diff --git a/.github/workflows/mpy_format.yml b/.github/workflows/mpy_format.yml
index b6768a46c3..4043b63288 100644
--- a/.github/workflows/mpy_format.yml
+++ b/.github/workflows/mpy_format.yml
@@ -17,7 +17,7 @@ jobs:
   test:
     runs-on: ubuntu-22.04 # use 22.04 to get python2
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_mpy_format_setup
     - name: Test mpy-tool.py
diff --git a/.github/workflows/ports.yml b/.github/workflows/ports.yml
index 1f262b0ba4..d4e89bd1aa 100644
--- a/.github/workflows/ports.yml
+++ b/.github/workflows/ports.yml
@@ -17,6 +17,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build ports download metadata
       run: mkdir boards && ./tools/autobuild/build-downloads.py . ./boards
diff --git a/.github/workflows/ports_alif.yml b/.github/workflows/ports_alif.yml
index 0e96e7d816..a06b3f96ff 100644
--- a/.github/workflows/ports_alif.yml
+++ b/.github/workflows/ports_alif.yml
@@ -26,7 +26,7 @@ jobs:
           - alif_ae3_build
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_alif_setup
     - name: Build ci_${{matrix.ci_func }}
diff --git a/.github/workflows/ports_cc3200.yml b/.github/workflows/ports_cc3200.yml
index f178a14058..b60ff370da 100644
--- a/.github/workflows/ports_cc3200.yml
+++ b/.github/workflows/ports_cc3200.yml
@@ -21,7 +21,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_cc3200_setup
     - name: Build
diff --git a/.github/workflows/ports_esp32.yml b/.github/workflows/ports_esp32.yml
index 4c07f89437..e83681e1d1 100644
--- a/.github/workflows/ports_esp32.yml
+++ b/.github/workflows/ports_esp32.yml
@@ -27,7 +27,7 @@ jobs:
           - esp32_build_s3_c3
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - id: idf_ver
       name: Read the ESP-IDF version (including Python version)
diff --git a/.github/workflows/ports_esp8266.yml b/.github/workflows/ports_esp8266.yml
index 5236edf40b..3293abed59 100644
--- a/.github/workflows/ports_esp8266.yml
+++ b/.github/workflows/ports_esp8266.yml
@@ -21,7 +21,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_esp8266_setup && ci_esp8266_path >> $GITHUB_PATH
     - name: Build
diff --git a/.github/workflows/ports_mimxrt.yml b/.github/workflows/ports_mimxrt.yml
index 7743e036ab..ae9a80ec58 100644
--- a/.github/workflows/ports_mimxrt.yml
+++ b/.github/workflows/ports_mimxrt.yml
@@ -24,7 +24,7 @@ jobs:
       run:
         working-directory: 'micropython repo'  # test build with space in path
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         path: 'micropython repo'
     - name: Install packages
diff --git a/.github/workflows/ports_nrf.yml b/.github/workflows/ports_nrf.yml
index 76727c9d1f..ce86617af0 100644
--- a/.github/workflows/ports_nrf.yml
+++ b/.github/workflows/ports_nrf.yml
@@ -21,7 +21,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_nrf_setup
     - name: Build
diff --git a/.github/workflows/ports_powerpc.yml b/.github/workflows/ports_powerpc.yml
index c41b13e5dd..81f71ca8a9 100644
--- a/.github/workflows/ports_powerpc.yml
+++ b/.github/workflows/ports_powerpc.yml
@@ -21,7 +21,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_powerpc_setup
     - name: Build
diff --git a/.github/workflows/ports_qemu.yml b/.github/workflows/ports_qemu.yml
index 57192c4393..80a285f8d5 100644
--- a/.github/workflows/ports_qemu.yml
+++ b/.github/workflows/ports_qemu.yml
@@ -22,7 +22,7 @@ jobs:
   build_and_test_arm:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_qemu_setup_arm
     - name: Build and run test suite
@@ -34,7 +34,7 @@ jobs:
   build_and_test_rv32:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_qemu_setup_rv32
     - name: Build and run test suite
diff --git a/.github/workflows/ports_renesas-ra.yml b/.github/workflows/ports_renesas-ra.yml
index b9fa74331d..bf99ed25fe 100644
--- a/.github/workflows/ports_renesas-ra.yml
+++ b/.github/workflows/ports_renesas-ra.yml
@@ -21,7 +21,7 @@ jobs:
   build_renesas_ra_board:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_renesas_ra_setup
     - name: Build
diff --git a/.github/workflows/ports_rp2.yml b/.github/workflows/ports_rp2.yml
index 748f38e143..22d2a96880 100644
--- a/.github/workflows/ports_rp2.yml
+++ b/.github/workflows/ports_rp2.yml
@@ -24,7 +24,7 @@ jobs:
       run:
         working-directory: 'micropython repo'  # test build with space in path
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         path: 'micropython repo'
     - name: Install packages
diff --git a/.github/workflows/ports_samd.yml b/.github/workflows/ports_samd.yml
index 5bf1826cd1..dbea255c79 100644
--- a/.github/workflows/ports_samd.yml
+++ b/.github/workflows/ports_samd.yml
@@ -21,7 +21,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_samd_setup
     - name: Build
diff --git a/.github/workflows/ports_stm32.yml b/.github/workflows/ports_stm32.yml
index 8800f14518..43659a5d5d 100644
--- a/.github/workflows/ports_stm32.yml
+++ b/.github/workflows/ports_stm32.yml
@@ -28,7 +28,7 @@ jobs:
           - stm32_misc_build
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_stm32_setup
     - name: Build ci_${{matrix.ci_func }}
diff --git a/.github/workflows/ports_unix.yml b/.github/workflows/ports_unix.yml
index 2547015038..efab5e6b35 100644
--- a/.github/workflows/ports_unix.yml
+++ b/.github/workflows/ports_unix.yml
@@ -23,7 +23,7 @@ jobs:
   minimal:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build
       run: source tools/ci.sh && ci_unix_minimal_build
     - name: Run main test suite
@@ -35,7 +35,7 @@ jobs:
   reproducible:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build with reproducible date
       run: source tools/ci.sh && ci_unix_minimal_build
       env:
@@ -46,7 +46,7 @@ jobs:
   standard:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build
       run: source tools/ci.sh && ci_unix_standard_build
     - name: Run main test suite
@@ -58,7 +58,7 @@ jobs:
   standard_v2:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build
       run: source tools/ci.sh && ci_unix_standard_v2_build
     - name: Run main test suite
@@ -70,7 +70,7 @@ jobs:
   coverage:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_coverage_setup
     - name: Build
@@ -100,7 +100,7 @@ jobs:
   coverage_32bit:
     runs-on: ubuntu-22.04 # use 22.04 to get libffi-dev:i386
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_32bit_setup
     - name: Build
@@ -118,7 +118,7 @@ jobs:
   nanbox:
     runs-on: ubuntu-22.04 # use 22.04 to get python2, and libffi-dev:i386
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_32bit_setup
     - name: Build
@@ -132,7 +132,7 @@ jobs:
   float:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build
       run: source tools/ci.sh && ci_unix_float_build
     - name: Run main test suite
@@ -144,7 +144,7 @@ jobs:
   stackless_clang:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_clang_setup
     - name: Build
@@ -158,7 +158,7 @@ jobs:
   float_clang:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_clang_setup
     - name: Build
@@ -172,7 +172,7 @@ jobs:
   settrace:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v5
       # Python 3.12 is the default for ubuntu-24.04, but that has compatibility issues with settrace tests.
       # Can remove this step when ubuntu-latest uses a more recent Python 3.x as the default.
@@ -189,7 +189,7 @@ jobs:
   settrace_stackless:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v5
       # Python 3.12 is the default for ubuntu-24.04, but that has compatibility issues with settrace tests.
       # Can remove this step when ubuntu-latest uses a more recent Python 3.x as the default.
@@ -206,7 +206,7 @@ jobs:
   macos:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v5
       with:
         python-version: '3.8'
@@ -222,7 +222,7 @@ jobs:
     # ubuntu-22.04 is needed for older libffi.
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_qemu_mips_setup
     - name: Build
@@ -237,7 +237,7 @@ jobs:
     # ubuntu-22.04 is needed for older libffi.
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_qemu_arm_setup
     - name: Build
@@ -252,7 +252,7 @@ jobs:
     # ubuntu-22.04 is needed for older libffi.
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_unix_qemu_riscv64_setup
     - name: Build
diff --git a/.github/workflows/ports_webassembly.yml b/.github/workflows/ports_webassembly.yml
index 880f15ab34..766be15928 100644
--- a/.github/workflows/ports_webassembly.yml
+++ b/.github/workflows/ports_webassembly.yml
@@ -20,7 +20,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_webassembly_setup
     - name: Build
diff --git a/.github/workflows/ports_windows.yml b/.github/workflows/ports_windows.yml
index 84e018ba15..dcca4b983c 100644
--- a/.github/workflows/ports_windows.yml
+++ b/.github/workflows/ports_windows.yml
@@ -59,7 +59,7 @@ jobs:
       if: matrix.runner == 'windows-2019'
       with:
         python-version: '3.9'
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build mpy-cross.exe
       run: msbuild mpy-cross\mpy-cross.vcxproj -maxcpucount -property:Configuration=${{ matrix.configuration }} -property:Platform=${{ matrix.platform }}
     - name: Update submodules
@@ -126,7 +126,7 @@ jobs:
           git
           diffutils
         path-type: inherit  # Remove when setup-python is removed
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build mpy-cross.exe
       run: make -C mpy-cross -j2
     - name: Update submodules
@@ -144,7 +144,7 @@ jobs:
   cross-build-on-linux:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install packages
       run: source tools/ci.sh && ci_windows_setup
     - name: Build
diff --git a/.github/workflows/ports_zephyr.yml b/.github/workflows/ports_zephyr.yml
index eb85af6a36..b3d1c061a1 100644
--- a/.github/workflows/ports_zephyr.yml
+++ b/.github/workflows/ports_zephyr.yml
@@ -29,7 +29,7 @@ jobs:
         large-packages: false
         docker-images: false
         swap-storage: false
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - id: versions
       name: Read Zephyr version
       run: source tools/ci.sh && echo "ZEPHYR=$ZEPHYR_VERSION" | tee "$GITHUB_OUTPUT"
diff --git a/.github/workflows/ruff.yml b/.github/workflows/ruff.yml
index 4c4a2a3162..633b0cdf82 100644
--- a/.github/workflows/ruff.yml
+++ b/.github/workflows/ruff.yml
@@ -6,7 +6,7 @@ jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     # ruff version should be kept in sync with .pre-commit-config.yaml & also micropython-lib
     - run: pipx install ruff==0.11.6
     - run: ruff check --output-format=github .