diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index d2c98c7..e302d39 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -32,7 +32,7 @@ jobs:
         language: [python]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 0bedf93..d67f4fe 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -21,7 +21,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d1709d3..217cde5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -32,7 +32,7 @@ jobs:
       version: ${{ steps.resolve-version.outputs.version }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -94,7 +94,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 41858bc..6777ad9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -46,7 +46,7 @@ jobs:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
diff --git a/.github/workflows/typecheck.yml b/.github/workflows/typecheck.yml
index 6b09475..53a33f8 100644
--- a/.github/workflows/typecheck.yml
+++ b/.github/workflows/typecheck.yml
@@ -26,7 +26,7 @@ jobs:
         python-version: ["3.9", "3.13"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5