diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b5ebaeb..83ab1c7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     name: Lint (ruff + mypy)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -46,7 +46,7 @@ jobs:
           - os: ubuntu-latest
             python-version: "3.13"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 4a08581..eb190a7 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -21,7 +21,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ea22057..8e15cb1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -29,7 +29,7 @@ jobs:
         # (requires `brew install libomp` + C compiler via Xcode CLT).
         # Re-enabling is one matrix entry.
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.22
@@ -58,7 +58,7 @@ jobs:
     name: Source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with: