diff --git a/.github/workflows/base.yml b/.github/workflows/base.yml
index de9c600..8b6b094 100644
--- a/.github/workflows/base.yml
+++ b/.github/workflows/base.yml
@@ -35,7 +35,7 @@ jobs:
     name: Quickcheck (${{ matrix.target.name }}, ACVP ${{ matrix.acvp-version }})
     runs-on: ${{ matrix.target.runner }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: Run ACVP test
         run: |
           make
@@ -60,7 +60,7 @@ jobs:
     name: Quickcheck C90 (${{ matrix.target.name }})
     runs-on: ${{ matrix.target.runner }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           submodules: true
       - name: make quickcheck
diff --git a/.github/workflows/cbmc.yml b/.github/workflows/cbmc.yml
index e3d05c2..6131cbe 100644
--- a/.github/workflows/cbmc.yml
+++ b/.github/workflows/cbmc.yml
@@ -14,7 +14,7 @@ jobs:
     name: CBMC
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - uses: ./.github/actions/cbmc
         with:
           gh_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f642fa5..f1c299d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -76,7 +76,7 @@ jobs:
             compiler: { darwin: False }
     runs-on: ${{ matrix.target.runner }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: build+functest (default)
         uses: ./.github/actions/multi-functest
         with:
diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index c5797a1..2b41407 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -19,7 +19,7 @@ jobs:
     outputs:
       run_needed: ${{ steps.check_run.outputs.run_needed }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         if: github.event_name != 'workflow_dispatch'
         with:
           fetch-depth: 0
@@ -60,7 +60,7 @@ jobs:
     name: build nix cache (${{ matrix.runner }})
     runs-on: ${{ matrix.runner }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - uses: ./.github/actions/setup-nix
         with:
           cache: true