diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5bed504..15aac8d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0  # full history for better blame info
 
@@ -54,7 +54,7 @@ jobs:
     name: Type Check
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Install uv
       uses: astral-sh/setup-uv@v6
@@ -81,7 +81,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Install uv
       uses: astral-sh/setup-uv@v6
@@ -127,7 +127,7 @@ jobs:
   #   needs: [lint, type-check, test]
   #   runs-on: ubuntu-latest
   #   steps:
-  #   - uses: actions/checkout@v4
+  #   - uses: actions/checkout@v6
 
   #   - name: Install uv
   #     uses: astral-sh/setup-uv@v3
@@ -151,7 +151,7 @@ jobs:
   #   name: Build Documentation
   #   runs-on: ubuntu-latest
   #   steps:
-  #   - uses: actions/checkout@v4
+  #   - uses: actions/checkout@v6
 
   #   - name: Install uv
   #     uses: astral-sh/setup-uv@v3