diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c43555b..72c857c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/notebook-contract.yml b/.github/workflows/notebook-contract.yml
index 221fe6c..94572a6 100644
--- a/.github/workflows/notebook-contract.yml
+++ b/.github/workflows/notebook-contract.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5