diff --git a/.github/workflows/macos_build.yml b/.github/workflows/macos_build.yml
index 7450c679..39f879f6 100644
--- a/.github/workflows/macos_build.yml
+++ b/.github/workflows/macos_build.yml
@@ -17,7 +17,7 @@ jobs:
           - "3.13"
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       # Normally, we would use the superbly maintained...
       # - uses: actions/setup-python@v2
       #   with:
diff --git a/.github/workflows/modified_scripts_build.yml b/.github/workflows/modified_scripts_build.yml
index e20d5f19..88f28878 100644
--- a/.github/workflows/modified_scripts_build.yml
+++ b/.github/workflows/modified_scripts_build.yml
@@ -6,7 +6,7 @@ jobs:
     outputs:
       versions: ${{steps.modified-versions.outputs.versions}}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: git fetch origin "$GITHUB_BASE_REF"
       - shell: bash
         run: >
@@ -39,7 +39,7 @@ jobs:
         os: ["macos-13", "macos-14", "macos-15"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: |
           #envvars
           export PYENV_ROOT="$GITHUB_WORKSPACE"
@@ -99,7 +99,7 @@ jobs:
         os: ["macos-13", "macos-14", "macos-15"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: |
           #envvars
           export PYENV_ROOT="$GITHUB_WORKSPACE"
@@ -160,7 +160,7 @@ jobs:
         os: ["ubuntu-22.04", "ubuntu-24.04"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: |
           #envvars
           export PYENV_ROOT="$GITHUB_WORKSPACE"
@@ -218,7 +218,7 @@ jobs:
         os: ["ubuntu-latest"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: |
           #envvars
           export PYENV_ROOT="$GITHUB_WORKSPACE"
diff --git a/.github/workflows/pyenv_tests.yml b/.github/workflows/pyenv_tests.yml
index dab75608..1597ea88 100644
--- a/.github/workflows/pyenv_tests.yml
+++ b/.github/workflows/pyenv_tests.yml
@@ -16,7 +16,7 @@ jobs:
           - macos-13
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       # Normally, we would use the superbly maintained...
       # - uses: actions/setup-python@v2
       #   with:
diff --git a/.github/workflows/ubuntu_build.yml b/.github/workflows/ubuntu_build.yml
index b8b08e2b..ad3542eb 100644
--- a/.github/workflows/ubuntu_build.yml
+++ b/.github/workflows/ubuntu_build.yml
@@ -17,7 +17,7 @@ jobs:
           - "3.13"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       # Normally, we would use the superbly maintained...
       # - uses: actions/setup-python@v2
       #   with: