diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5620b93..88b3ee3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
         PYTHON_VERSION: ["3.10", "3.11", "3.12", "3.13"]
     steps:
       # Fast shallow checkout for testing
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.PYTHON_VERSION }}
         uses: actions/setup-python@v5
         with:
@@ -49,7 +49,7 @@ jobs:
     steps:
       # Fast shallow checkout for linting
       - name: Checkout branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install Python 3.13
         uses: actions/setup-python@v5
         with:
@@ -64,7 +64,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/v')  # Only on version tags
     steps:
       # Deep checkout for setuptools_scm (only when releasing)
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Full git history for setuptools_scm
       - name: Set up Python 3.13