diff --git a/.github/workflows/CICD.yml b/.github/workflows/CICD.yml
index d387f566f..27378cd96 100644
--- a/.github/workflows/CICD.yml
+++ b/.github/workflows/CICD.yml
@@ -30,7 +30,7 @@ jobs:
     name: Style/cargo-deny
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: EmbarkStudios/cargo-deny-action@v1
 
   style_deps:
@@ -47,7 +47,7 @@ jobs:
           - { os: macos-latest   , features: "feat_Tier1,feat_require_unix,feat_require_unix_utmpx" }
           - { os: windows-latest , features: feat_os_windows }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly
     ## note: requires 'nightly' toolchain b/c `cargo-udeps` uses the `rustc` '-Z save-analysis' option
     ## * ... ref: <https://github.com/est31/cargo-udeps/issues/73>
@@ -91,7 +91,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: stable
@@ -131,7 +131,7 @@ jobs:
     env:
       RUN_FOR: 60
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly
     - name: Install `cargo-fuzz`
       run: cargo install cargo-fuzz
@@ -182,7 +182,7 @@ jobs:
           - { os: macos-latest   , features: feat_os_macos }
           - { os: windows-latest , features: feat_os_windows }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: stable
@@ -238,7 +238,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Initialize workflow variables
       id: vars
       shell: bash
@@ -292,7 +292,7 @@ jobs:
 #          - { os: macos-latest   , features: feat_os_macos }
 #          - { os: windows-latest , features: feat_os_windows }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: stable
@@ -345,7 +345,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ env.RUST_MIN_SRV }}
@@ -413,7 +413,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - uses: Swatinem/rust-cache@v2
     - name: "`cargo update` testing"
@@ -436,7 +436,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - uses: taiki-e/install-action@nextest
     - uses: Swatinem/rust-cache@v2
@@ -490,7 +490,7 @@ jobs:
           - { os: macos-latest   , features: feat_os_macos }
           - { os: windows-latest , features: feat_os_windows }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - uses: taiki-e/install-action@nextest
     - uses: Swatinem/rust-cache@v2
@@ -517,7 +517,7 @@ jobs:
           - { os: macos-latest   , features: feat_os_macos }
           - { os: windows-latest , features: feat_os_windows }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly
     - uses: taiki-e/install-action@nextest
     - uses: Swatinem/rust-cache@v2
@@ -541,7 +541,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - uses: Swatinem/rust-cache@v2
     - name: Run sccache-cache
@@ -661,7 +661,7 @@ jobs:
           - { os: windows-latest , target: x86_64-pc-windows-gnu       , features: feat_os_windows } ## note: requires rust >= 1.43.0 to link correctly
           - { os: windows-latest , target: x86_64-pc-windows-msvc      , features: feat_os_windows }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ env.RUST_MIN_SRV }}
@@ -920,7 +920,7 @@ jobs:
       run: |
         ## VARs setup
         echo "TEST_SUMMARY_FILE=busybox-result.json" >> $GITHUB_OUTPUT
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: Swatinem/rust-cache@v2
     - name: Run sccache-cache
       uses: mozilla-actions/sccache-action@v0.0.3
@@ -1000,7 +1000,7 @@ jobs:
         outputs() { step_id="${{ github.action }}"; for var in "$@" ; do echo steps.${step_id}.outputs.${var}="${!var}"; echo "${var}=${!var}" >> $GITHUB_OUTPUT; done; }
         TEST_SUMMARY_FILE="toybox-result.json"
         outputs TEST_SUMMARY_FILE
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ env.RUST_MIN_SRV }}
@@ -1071,7 +1071,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Check
         run: npx --yes @taplo/cli fmt --check
@@ -1091,7 +1091,7 @@ jobs:
           - { os: macos-latest   , features: macos, toolchain: nightly }
           - { os: windows-latest , features: windows, toolchain: nightly-x86_64-pc-windows-gnu }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ matrix.job.toolchain }}
diff --git a/.github/workflows/CheckScripts.yml b/.github/workflows/CheckScripts.yml
index e1b3b24d2..98ae6cb75 100644
--- a/.github/workflows/CheckScripts.yml
+++ b/.github/workflows/CheckScripts.yml
@@ -29,7 +29,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
         env:
@@ -50,7 +50,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Setup shfmt
         uses: mfinelli/setup-shfmt@v2
       - name: Run shfmt
diff --git a/.github/workflows/FixPR.yml b/.github/workflows/FixPR.yml
index 97b0be34a..7f5e5234d 100644
--- a/.github/workflows/FixPR.yml
+++ b/.github/workflows/FixPR.yml
@@ -26,7 +26,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Initialize job variables
       id: vars
       shell: bash
@@ -85,7 +85,7 @@ jobs:
         job:
           - { os: ubuntu-latest , features: feat_os_unix }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Initialize job variables
       id: vars
       shell: bash
diff --git a/.github/workflows/GnuTests.yml b/.github/workflows/GnuTests.yml
index ccb5a6f74..61f30eba4 100644
--- a/.github/workflows/GnuTests.yml
+++ b/.github/workflows/GnuTests.yml
@@ -55,7 +55,7 @@ jobs:
         TEST_FULL_SUMMARY_FILE='gnu-full-result.json'
         outputs SUITE_LOG_FILE ROOT_SUITE_LOG_FILE TEST_FILESET_PREFIX TEST_FILESET_SUFFIX TEST_LOGS_GLOB TEST_SUMMARY_FILE TEST_FULL_SUMMARY_FILE
     - name: Checkout code (uutil)
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: '${{ steps.vars.outputs.path_UUTILS }}'
     - uses: dtolnay/rust-toolchain@master
@@ -66,7 +66,7 @@ jobs:
       with:
         workspaces: "./${{ steps.vars.outputs.path_UUTILS }} -> target"
     - name: Checkout code (GNU coreutils)
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: 'coreutils/coreutils'
         path: '${{ steps.vars.outputs.path_GNU }}'
@@ -307,11 +307,11 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Checkout code uutil
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: 'uutils'
     - name: Checkout GNU coreutils
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: 'coreutils/coreutils'
         path: 'gnu'
diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index a6929b171..5834aceff 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -26,7 +26,7 @@ jobs:
     env:
       TERMUX: v0.118.0
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Restore AVD cache
       uses: actions/cache/restore@v3
       id: avd-cache
diff --git a/.github/workflows/freebsd.yml b/.github/workflows/freebsd.yml
index 095ec3230..5af3da320 100644
--- a/.github/workflows/freebsd.yml
+++ b/.github/workflows/freebsd.yml
@@ -30,7 +30,7 @@ jobs:
       SCCACHE_GHA_ENABLED: "true"
       RUSTC_WRAPPER: "sccache"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: Swatinem/rust-cache@v2
     - name: Run sccache-cache
       uses: mozilla-actions/sccache-action@v0.0.3
@@ -120,7 +120,7 @@ jobs:
       SCCACHE_GHA_ENABLED: "true"
       RUSTC_WRAPPER: "sccache"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: Swatinem/rust-cache@v2
     - name: Run sccache-cache
       uses: mozilla-actions/sccache-action@v0.0.3