diff --git a/.github/workflows/build_inc.yml b/.github/workflows/build_inc.yml
index dae514a..a3cda2f 100644
--- a/.github/workflows/build_inc.yml
+++ b/.github/workflows/build_inc.yml
@@ -19,7 +19,7 @@ jobs:
           - "alt"
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         ref: ${{ inputs.gitref }}
         fetch-depth: 0  # detect tagged ver in repo
diff --git a/.github/workflows/compat.yml b/.github/workflows/compat.yml
index 6614466..fbbb194 100644
--- a/.github/workflows/compat.yml
+++ b/.github/workflows/compat.yml
@@ -13,7 +13,7 @@ jobs:
           - '1.18.1'
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: astral-sh/setup-uv@v7
         with:
@@ -41,7 +41,7 @@ jobs:
           - '1.1.406'
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: astral-sh/setup-uv@v7
         with:
@@ -112,7 +112,7 @@ jobs:
 
     runs-on: 'ubuntu-24.04'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with:
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 69dc5f1..8222d80 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -12,7 +12,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Linting and import sort
         uses: chartboost/ruff-action@v1
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 9c4264b..39c33ea 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -17,7 +17,7 @@ jobs:
       contents: read
       pull-requests: write
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         ref: ${{ github.event.pull_request.head.sha }}