diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 97075c7..c261583 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     name: Lint (ruff)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup uv environment
         uses: ./.github/actions/setup-uv
@@ -28,7 +28,7 @@ jobs:
     name: Test (pytest)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup uv environment
         uses: ./.github/actions/setup-uv
@@ -56,7 +56,7 @@ jobs:
     name: Docs (Sphinx)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup uv environment
         uses: ./.github/actions/setup-uv