diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bb29a67..54425e3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -55,7 +55,7 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
@@ -111,7 +111,7 @@ jobs:
         run: |
           apt update && apt install git -yq
           git config --global --add safe.directory "$GITHUB_WORKSPACE"
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 1
           persist-credentials: false
@@ -148,7 +148,7 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
@@ -325,7 +325,7 @@ jobs:
       OPENSSL_DIR: ${{ github.workspace }}/multissl/openssl/${{ matrix.openssl_ver }}
       LD_LIBRARY_PATH: ${{ github.workspace }}/multissl/openssl/${{ matrix.openssl_ver }}/lib
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Runner image version
@@ -387,7 +387,7 @@ jobs:
       OPENSSL_VER: 3.0.16
       PYTHONSTRICTEXTENSIONBUILD: 1
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Register gcc problem matcher
@@ -508,7 +508,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       ASAN_OPTIONS: detect_leaks=0:allocator_may_return_null=1:handle_segv=0
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Runner image version
@@ -589,7 +589,7 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - name: Runner image version
diff --git a/.github/workflows/jit.yml b/.github/workflows/jit.yml
index 116e0c1..3053315 100644
--- a/.github/workflows/jit.yml
+++ b/.github/workflows/jit.yml
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 90
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - name: Build tier two interpreter
@@ -88,7 +88,7 @@ jobs:
             architecture: aarch64
             runner: ubuntu-24.04-arm
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
@@ -138,7 +138,7 @@ jobs:
   #       llvm:
   #         - 19
   #   steps:
-  #     - uses: actions/checkout@v4
+  #     - uses: actions/checkout@v5
   #       with:
   #         persist-credentials: false
   #     - uses: actions/setup-python@v5
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index d74ce8f..1e5b08b 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -19,7 +19,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 9dbdd60..d72a2dc 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -60,7 +60,7 @@ jobs:
           "Tools/wasm",
         ]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
diff --git a/.github/workflows/reusable-context.yml b/.github/workflows/reusable-context.yml
index d2668dd..89a7861 100644
--- a/.github/workflows/reusable-context.yml
+++ b/.github/workflows/reusable-context.yml
@@ -57,7 +57,7 @@ jobs:
     - run: >-
         echo '${{ github.event_name }}'
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
         ref: >-
diff --git a/.github/workflows/reusable-docs.yml b/.github/workflows/reusable-docs.yml
index 657e0a6..cb5363a 100644
--- a/.github/workflows/reusable-docs.yml
+++ b/.github/workflows/reusable-docs.yml
@@ -27,7 +27,7 @@ jobs:
       refspec_pr: '+${{ github.event.pull_request.head.sha }}:remotes/origin/${{ github.event.pull_request.head.ref }}'
     steps:
     - name: 'Check out latest PR branch commit'
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         persist-credentials: false
         ref: >-
@@ -82,7 +82,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - uses: actions/cache@v4
diff --git a/.github/workflows/reusable-macos.yml b/.github/workflows/reusable-macos.yml
index de0c402..2dcba4d 100644
--- a/.github/workflows/reusable-macos.yml
+++ b/.github/workflows/reusable-macos.yml
@@ -31,7 +31,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Runner image version
diff --git a/.github/workflows/reusable-san.yml b/.github/workflows/reusable-san.yml
index e6ff02e..fe7238a 100644
--- a/.github/workflows/reusable-san.yml
+++ b/.github/workflows/reusable-san.yml
@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Runner image version
diff --git a/.github/workflows/reusable-ubuntu.yml b/.github/workflows/reusable-ubuntu.yml
index 76b19fd..0566c98 100644
--- a/.github/workflows/reusable-ubuntu.yml
+++ b/.github/workflows/reusable-ubuntu.yml
@@ -34,7 +34,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Register gcc problem matcher
diff --git a/.github/workflows/reusable-wasi.yml b/.github/workflows/reusable-wasi.yml
index 4ad8add..6bead5b 100644
--- a/.github/workflows/reusable-wasi.yml
+++ b/.github/workflows/reusable-wasi.yml
@@ -22,7 +22,7 @@ jobs:
       CROSS_BUILD_PYTHON: cross-build/build
       CROSS_BUILD_WASI: cross-build/wasm32-wasip1
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     # No problem resolver registered as one doesn't currently exist for Clang.
diff --git a/.github/workflows/reusable-windows-msi.yml b/.github/workflows/reusable-windows-msi.yml
index a50de34..cff3554 100644
--- a/.github/workflows/reusable-windows-msi.yml
+++ b/.github/workflows/reusable-windows-msi.yml
@@ -23,7 +23,7 @@ jobs:
       ARCH: ${{ inputs.arch }}
       IncludeFreethreaded: true
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Build CPython installer
diff --git a/.github/workflows/reusable-windows.yml b/.github/workflows/reusable-windows.yml
index 37c8020..6d7768d 100644
--- a/.github/workflows/reusable-windows.yml
+++ b/.github/workflows/reusable-windows.yml
@@ -26,7 +26,7 @@ jobs:
     env:
       ARCH: ${{ inputs.arch }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         persist-credentials: false
     - name: Register MSVC problem matcher
diff --git a/.github/workflows/tail-call.yml b/.github/workflows/tail-call.yml
index e32cbf0..efc1aa4 100644
--- a/.github/workflows/tail-call.yml
+++ b/.github/workflows/tail-call.yml
@@ -72,7 +72,7 @@ jobs:
             architecture: x86_64
             runner: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5
diff --git a/.github/workflows/verify-ensurepip-wheels.yml b/.github/workflows/verify-ensurepip-wheels.yml
index 463e7bf..e333eca 100644
--- a/.github/workflows/verify-ensurepip-wheels.yml
+++ b/.github/workflows/verify-ensurepip-wheels.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-python@v5