diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a6b7cfd5..c77be47a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         compiler: [clang++-15, g++-12]
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
     - name: Install Dependencies
       # Boost must be installed only because the CMake version (3.12) can't
       # detect the installed Boost version (1.69)
@@ -37,7 +37,7 @@ jobs:
       matrix:
         compiler: [clang++, g++]
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
     - name: Install Dependencies
       # Boost must be installed only because the CMake version (3.12) can't
       # detect the installed Boost version (1.69)
@@ -64,7 +64,7 @@ jobs:
     needs: [linux-min]
     runs-on: windows-2022
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
     - name: Run Tests
       shell: powershell
       # Delete the exercises that require Boost to avoid issues with Windows setup.
@@ -80,7 +80,7 @@ jobs:
     needs: [linux-min]
     runs-on: macOS-latest
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
     - name: Install Boost
       run: brew install boost
     - name: Run Tests
diff --git a/.github/workflows/hello-world.yml b/.github/workflows/hello-world.yml
index 0f784cf7..e96bc3e7 100644
--- a/.github/workflows/hello-world.yml
+++ b/.github/workflows/hello-world.yml
@@ -21,7 +21,7 @@ jobs:
     name: Hello World Fails
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
     - name: Check Hello World Fails
       run: bin/check-hello-world.sh
       env:
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index 64b372ed..ecc8c27e 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
         with:
           ref: ${{github.event.pull_request.head.sha}}
           repository: ${{github.event.pull_request.head.repo.full_name}}