diff --git a/.github/workflows/add-issue-header.yml b/.github/workflows/add-issue-header.yml
index 3cbc23af578d10..c404bc519300e2 100644
--- a/.github/workflows/add-issue-header.yml
+++ b/.github/workflows/add-issue-header.yml
@@ -20,7 +20,7 @@ jobs:
       issues: write
     timeout-minutes: 5
     steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v8
         with:
           # language=JavaScript
           script: |
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6769cdd4531a0c..7d7d6c88394706 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -64,7 +64,7 @@ jobs:
         run: |
           apt update && apt install git -yq
           git config --global --add safe.directory "$GITHUB_WORKSPACE"
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 1
           persist-credentials: false
@@ -101,10 +101,10 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.x'
       - name: Runner image version
@@ -264,7 +264,7 @@ 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@v6
       with:
         persist-credentials: false
     - name: Runner image version
@@ -280,7 +280,7 @@ jobs:
         echo "LD_LIBRARY_PATH=${GITHUB_WORKSPACE}/multissl/openssl/${OPENSSL_VER}/lib" >> "$GITHUB_ENV"
     - name: 'Restore OpenSSL build'
       id: cache-openssl
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ./multissl/openssl/${{ env.OPENSSL_VER }}
         key: ${{ matrix.os }}-multissl-openssl-${{ env.OPENSSL_VER }}
@@ -316,7 +316,7 @@ jobs:
       OPENSSL_DIR: ${{ github.workspace }}/multissl/aws-lc/${{ matrix.awslc_ver }}
       LD_LIBRARY_PATH: ${{ github.workspace }}/multissl/aws-lc/${{ matrix.awslc_ver }}/lib
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Runner image version
@@ -332,7 +332,7 @@ jobs:
         echo "LD_LIBRARY_PATH=${GITHUB_WORKSPACE}/multissl/aws-lc/${AWSLC_VER}/lib" >> "$GITHUB_ENV"
     - name: 'Restore AWS-LC build'
       id: cache-aws-lc
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ./multissl/aws-lc/${{ matrix.awslc_ver }}
         key: ${{ matrix.os }}-multissl-aws-lc-${{ matrix.awslc_ver }}
@@ -381,7 +381,7 @@ jobs:
 
     runs-on: ${{ matrix.runs-on }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Build and test
@@ -394,7 +394,7 @@ jobs:
     timeout-minutes: 60
     runs-on: macos-14
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 
@@ -426,7 +426,7 @@ jobs:
       OPENSSL_VER: 3.0.18
       PYTHONSTRICTEXTENSIONBUILD: 1
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Register gcc problem matcher
@@ -440,7 +440,7 @@ jobs:
         echo "LD_LIBRARY_PATH=${GITHUB_WORKSPACE}/multissl/openssl/${OPENSSL_VER}/lib" >> "$GITHUB_ENV"
     - name: 'Restore OpenSSL build'
       id: cache-openssl
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ./multissl/openssl/${{ env.OPENSSL_VER }}
         key: ${{ runner.os }}-multissl-openssl-${{ env.OPENSSL_VER }}
@@ -490,7 +490,7 @@ jobs:
         ./python -m venv "$VENV_LOC" && "$VENV_PYTHON" -m pip install -r "${GITHUB_WORKSPACE}/Tools/requirements-hypothesis.txt"
     - name: 'Restore Hypothesis database'
       id: cache-hypothesis-database
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{ env.CPYTHON_BUILDDIR }}/.hypothesis/
         key: hypothesis-database-${{ github.head_ref || github.run_id }}
@@ -517,7 +517,7 @@ jobs:
           -x test_subprocess \
           -x test_signal \
           -x test_sysconfig
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: hypothesis-example-db
@@ -538,7 +538,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       ASAN_OPTIONS: detect_leaks=0:allocator_may_return_null=1:handle_segv=0
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Runner image version
@@ -548,7 +548,7 @@ jobs:
     - name: Install dependencies
       run: sudo ./.github/workflows/posix-deps-apt.sh
     - name: Set up GCC-10 for ASAN
-      uses: egor-tensin/setup-gcc@v1
+      uses: egor-tensin/setup-gcc@v2
       with:
         version: 10
     - name: Configure OpenSSL env vars
@@ -558,7 +558,7 @@ jobs:
         echo "LD_LIBRARY_PATH=${GITHUB_WORKSPACE}/multissl/openssl/${OPENSSL_VER}/lib" >> "$GITHUB_ENV"
     - name: 'Restore OpenSSL build'
       id: cache-openssl
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ./multissl/openssl/${{ env.OPENSSL_VER }}
         key: ${{ matrix.os }}-multissl-openssl-${{ env.OPENSSL_VER }}
@@ -608,7 +608,7 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-ubuntu == 'true'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Runner image version
@@ -665,13 +665,13 @@ jobs:
           sanitizer: ${{ matrix.sanitizer }}
       - name: Upload crash
         if: failure() && steps.build.outcome == 'success'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.sanitizer }}-artifacts
           path: ./out/artifacts
       - name: Upload SARIF
         if: always() && steps.build.outcome == 'success'
-        uses: github/codeql-action/upload-sarif@v3
+        uses: github/codeql-action/upload-sarif@v4
         with:
           sarif_file: cifuzz-sarif/results.sarif
           checkout_path: cifuzz-sarif
diff --git a/.github/workflows/jit.yml b/.github/workflows/jit.yml
index 62325250bd368e..a6bade2c044f80 100644
--- a/.github/workflows/jit.yml
+++ b/.github/workflows/jit.yml
@@ -38,7 +38,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 90
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Build tier two interpreter
@@ -92,10 +92,10 @@ jobs:
             architecture: aarch64
             runner: ubuntu-24.04-arm
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
 
@@ -140,10 +140,10 @@ jobs:
         llvm:
           - 21
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
       - name: Build with JIT enabled and GIL disabled
@@ -168,10 +168,10 @@ jobs:
         llvm:
           - 21
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
       - name: Build with JIT
@@ -195,10 +195,10 @@ jobs:
         llvm:
           - 21
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
       - name: Build with JIT and tailcall
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 12fad966845dea..0ded53b00da0ef 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@v6
         with:
           persist-credentials: false
       - uses: j178/prek-action@v1
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 8810730e193bb6..db363bef7a45ae 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -65,10 +65,10 @@ jobs:
           "Tools/peg_generator",
         ]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.13"
           cache: pip
diff --git a/.github/workflows/new-bugs-announce-notifier.yml b/.github/workflows/new-bugs-announce-notifier.yml
index 9f1a8a824e5f19..b25750f0897de2 100644
--- a/.github/workflows/new-bugs-announce-notifier.yml
+++ b/.github/workflows/new-bugs-announce-notifier.yml
@@ -13,12 +13,12 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20
       - run: npm install mailgun.js form-data
       - name: Send notification
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         env:
           MAILGUN_API_KEY: ${{ secrets.MAILGUN_PYTHON_ORG_MAILGUN_KEY }}
         with:
diff --git a/.github/workflows/reusable-context.yml b/.github/workflows/reusable-context.yml
index ce5562f2d51fbb..aa2ee275a57fa9 100644
--- a/.github/workflows/reusable-context.yml
+++ b/.github/workflows/reusable-context.yml
@@ -66,14 +66,14 @@ jobs:
       run-windows-tests: ${{ steps.changes.outputs.run-windows-tests }}
     steps:
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: "3"
 
     - run: >-
         echo '${{ github.event_name }}'
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
         ref: >-
diff --git a/.github/workflows/reusable-docs.yml b/.github/workflows/reusable-docs.yml
index 65154aae4c41d5..fc68c040fca059 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@v6
       with:
         persist-credentials: false
         ref: >-
@@ -52,7 +52,7 @@ jobs:
         git fetch origin "${refspec_base}" --shallow-since="${DATE}" \
           --no-tags --prune --no-recurse-submodules
     - name: 'Set up Python'
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3'
         cache: 'pip'
@@ -82,10 +82,10 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
-    - uses: actions/cache@v4
+    - uses: actions/cache@v5
       with:
         path: ~/.cache/pip
         key: ubuntu-doc-${{ hashFiles('Doc/requirements.txt') }}
@@ -108,11 +108,11 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: 'Set up Python'
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3'
         cache: 'pip'
diff --git a/.github/workflows/reusable-macos.yml b/.github/workflows/reusable-macos.yml
index 98d557ba1eab84..7eef66bd9d9324 100644
--- a/.github/workflows/reusable-macos.yml
+++ b/.github/workflows/reusable-macos.yml
@@ -28,7 +28,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Runner image version
diff --git a/.github/workflows/reusable-san.yml b/.github/workflows/reusable-san.yml
index c601d0b73380d4..49876cf49260d9 100644
--- a/.github/workflows/reusable-san.yml
+++ b/.github/workflows/reusable-san.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Runner image version
@@ -99,7 +99,7 @@ jobs:
       run: find "${GITHUB_WORKSPACE}" -name 'san_log.*' | xargs head -n 1000
     - name: Archive logs
       if: always()
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: >-
           ${{ inputs.sanitizer }}-logs-${{
diff --git a/.github/workflows/reusable-ubuntu.yml b/.github/workflows/reusable-ubuntu.yml
index 0c1ebe29ae322f..ad725e92f2b20f 100644
--- a/.github/workflows/reusable-ubuntu.yml
+++ b/.github/workflows/reusable-ubuntu.yml
@@ -31,7 +31,7 @@ jobs:
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Register gcc problem matcher
@@ -51,7 +51,7 @@ jobs:
         echo "LD_LIBRARY_PATH=${GITHUB_WORKSPACE}/multissl/openssl/${OPENSSL_VER}/lib" >> "$GITHUB_ENV"
     - name: 'Restore OpenSSL build'
       id: cache-openssl
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ./multissl/openssl/${{ env.OPENSSL_VER }}
         key: ${{ inputs.os }}-multissl-openssl-${{ env.OPENSSL_VER }}
diff --git a/.github/workflows/reusable-wasi.yml b/.github/workflows/reusable-wasi.yml
index 91d76fd1b5f8c5..4b03712eb1ee08 100644
--- a/.github/workflows/reusable-wasi.yml
+++ b/.github/workflows/reusable-wasi.yml
@@ -18,7 +18,7 @@ jobs:
       CROSS_BUILD_PYTHON: cross-build/build
       CROSS_BUILD_WASI: cross-build/wasm32-wasip1
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     # No problem resolver registered as one doesn't currently exist for Clang.
@@ -28,7 +28,7 @@ jobs:
         version: ${{ env.WASMTIME_VERSION }}
     - name: "Restore WASI SDK"
       id: cache-wasi-sdk
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{ env.WASI_SDK_PATH }}
         key: ${{ runner.os }}-wasi-sdk-${{ env.WASI_SDK_VERSION }}
@@ -41,7 +41,7 @@ jobs:
     - name: "Add ccache to PATH"
       run: echo "PATH=/usr/lib/ccache:$PATH" >> "$GITHUB_ENV"
     - name: "Install Python"
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
     - name: "Runner image version"
diff --git a/.github/workflows/reusable-windows-msi.yml b/.github/workflows/reusable-windows-msi.yml
index c95e40a38095f9..c7611804369600 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@v6
       with:
         persist-credentials: false
     - name: Build CPython installer
diff --git a/.github/workflows/reusable-windows.yml b/.github/workflows/reusable-windows.yml
index 0648b770753255..82ea819867ef6d 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@v6
       with:
         persist-credentials: false
     - name: Register MSVC problem matcher
diff --git a/.github/workflows/tail-call.yml b/.github/workflows/tail-call.yml
index 1bc1bf20de0e06..335e1a93dce4ea 100644
--- a/.github/workflows/tail-call.yml
+++ b/.github/workflows/tail-call.yml
@@ -72,10 +72,10 @@ jobs:
             architecture: x86_64
             runner: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
 
diff --git a/.github/workflows/verify-ensurepip-wheels.yml b/.github/workflows/verify-ensurepip-wheels.yml
index 463e7bf3355cc3..135979078710cc 100644
--- a/.github/workflows/verify-ensurepip-wheels.yml
+++ b/.github/workflows/verify-ensurepip-wheels.yml
@@ -25,10 +25,10 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3'
       - name: Compare checksum of bundled wheels to the ones published on PyPI