diff --git a/.github/workflows/autotools-cmake.yml b/.github/workflows/autotools-cmake.yml
index f1a84add..8b15489a 100644
--- a/.github/workflows/autotools-cmake.yml
+++ b/.github/workflows/autotools-cmake.yml
@@ -60,7 +60,7 @@ jobs:
         shell: bash
     runs-on: "${{ matrix.os }}"
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
 
     - name: (Linux) Install build dependencies
       if: "${{ runner.os == 'Linux' }}"
diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index 6f8a6ddf..65b25285 100644
--- a/.github/workflows/clang-format.yml
+++ b/.github/workflows/clang-format.yml
@@ -45,7 +45,7 @@ jobs:
     name: Enforce clang-format clean code
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
 
     - name: Install clang-format 18
       run: |-
diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
index 17b8bf03..e5cc36cb 100644
--- a/.github/workflows/clang-tidy.yml
+++ b/.github/workflows/clang-tidy.yml
@@ -45,7 +45,7 @@ jobs:
     name: Enforce clang-tidy clean code
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
 
     - name: Install clang-tidy 18
       run: |-
diff --git a/.github/workflows/cmake-required-version.yml b/.github/workflows/cmake-required-version.yml
index f9ef9fc6..adb8cfe2 100644
--- a/.github/workflows/cmake-required-version.yml
+++ b/.github/workflows/cmake-required-version.yml
@@ -45,7 +45,7 @@ jobs:
     name: Ensure realistic minimum CMake version requirement
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
 
     - name: Install ancient CMake
       run: |
diff --git a/.github/workflows/codespell.yml b/.github/workflows/codespell.yml
index c77fe3d0..63f6549a 100644
--- a/.github/workflows/codespell.yml
+++ b/.github/workflows/codespell.yml
@@ -45,7 +45,7 @@ jobs:
     name: Enforce codespell-clean spelling
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
     - uses: codespell-project/actions-codespell@94259cd8be02ad2903ba34a22d9c13de21a74461  # v2.0
       with:
         path: expat/
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 723f92af..0b4cfc46 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -47,7 +47,7 @@ jobs:
     env:
       CFLAGS: -g3 -pipe
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
     - name: Install build dependencies
       run: |-
         set -x -u
diff --git a/.github/workflows/cppcheck.yml b/.github/workflows/cppcheck.yml
index d9b29b64..3c2a5cb5 100644
--- a/.github/workflows/cppcheck.yml
+++ b/.github/workflows/cppcheck.yml
@@ -45,7 +45,7 @@ jobs:
     name: Run Cppcheck
     runs-on: macos-12
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
     - name: Install runtime dependencies
       run: |
         exec brew install cppcheck findutils
diff --git a/.github/workflows/expat_config_h.yml b/.github/workflows/expat_config_h.yml
index c04bc175..05a14405 100644
--- a/.github/workflows/expat_config_h.yml
+++ b/.github/workflows/expat_config_h.yml
@@ -45,7 +45,7 @@ jobs:
     name: Check expat_config.h.{in,cmake} for regressions
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
     - name: Check expat_config.h.{in,cmake} for regressions
       run: |
         set -v
diff --git a/.github/workflows/fuzzing.yml b/.github/workflows/fuzzing.yml
index 68136006..8731b041 100644
--- a/.github/workflows/fuzzing.yml
+++ b/.github/workflows/fuzzing.yml
@@ -44,7 +44,7 @@ jobs:
     name: Run fuzzing regression tests
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
 
     - name: Install Clang 18
       run: |-
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 9aa849c8..15d8faee 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -89,7 +89,7 @@ jobs:
     env:
       CFLAGS: -g3 -pipe
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
     - name: Install build dependencies (MinGW)
       if: "${{ contains(matrix.FLAT_ENV, 'mingw') }}"
       run: |-
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 27d8bb58..72991551 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -55,7 +55,7 @@ jobs:
             FLAT_ENV: CC=clang CXX=clang++ LD=clang++ QA_SANITIZER=address
     runs-on: macos-11
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
     - name: Install build dependencies
       run: |
         sudo rm /usr/local/bin/2to3  # so that "brew link" will work
diff --git a/.github/workflows/valid-xml.yml b/.github/workflows/valid-xml.yml
index 8246ce8e..8168f148 100644
--- a/.github/workflows/valid-xml.yml
+++ b/.github/workflows/valid-xml.yml
@@ -45,7 +45,7 @@ jobs:
     name: Ensure well-formed and valid XML
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+    - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633  # v4.1.2
 
     - name: Install build dependencies
       run: |-