diff --git a/.github/workflows/build-containers.yml b/.github/workflows/build-containers.yml
index 9dc1bd7..7b75d3b 100644
--- a/.github/workflows/build-containers.yml
+++ b/.github/workflows/build-containers.yml
@@ -29,7 +29,7 @@ jobs:
       packages: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -70,7 +70,7 @@ jobs:
       packages: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
diff --git a/.github/workflows/check-latex-versions.yml b/.github/workflows/check-latex-versions.yml
index 8d6a90a..479fe4f 100644
--- a/.github/workflows/check-latex-versions.yml
+++ b/.github/workflows/check-latex-versions.yml
@@ -9,7 +9,7 @@ jobs:
   check-versions:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       
       - name: Check LaTeX Package Versions
         run: ./scripts/check-latex-versions.sh
diff --git a/.github/workflows/test-container.yml b/.github/workflows/test-container.yml
index 363666c..b3bc766 100644
--- a/.github/workflows/test-container.yml
+++ b/.github/workflows/test-container.yml
@@ -17,7 +17,7 @@ jobs:
     if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           # Test files must match the commit that built the image. For
           # workflow_run events checkout defaults to the default branch, not the
@@ -63,7 +63,7 @@ jobs:
     if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           # Test files must match the commit that built the image. For
           # workflow_run events checkout defaults to the default branch, not the
diff --git a/.github/workflows/test-containers-lectures.yml b/.github/workflows/test-containers-lectures.yml
index 65fa487..3a7c934 100644
--- a/.github/workflows/test-containers-lectures.yml
+++ b/.github/workflows/test-containers-lectures.yml
@@ -56,7 +56,7 @@ jobs:
 
     steps:
       - name: Checkout actions repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           # Use the composite actions from the commit that built the container
           # under test. workflow_run checks out the default branch by default;
@@ -65,7 +65,7 @@ jobs:
           path: actions-repo
 
       - name: Checkout lecture repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{ matrix.repo.owner }}/${{ matrix.repo.repo }}
           path: lecture-repo