diff --git a/.github/workflows/build-docs.yml b/.github/workflows/build-docs.yml
index 72d7018..b30c250 100644
--- a/.github/workflows/build-docs.yml
+++ b/.github/workflows/build-docs.yml
@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Check out sources
-      uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
     - name: Install dependencies
       run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7f9a0bf..9815589 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
       run: sudo apt install doctest-dev clang clang-tidy
       if: matrix.os == 'ubuntu-latest'
 
-    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+    - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
     - name: Create Build Environment
       run: cmake -E make_directory ${{github.workspace}}/build/${{ matrix.build_type }}
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index a815112..577dc08 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2