diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 79ac754c..f0be5a7d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     steps:
       - run: echo $(hostname)
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 0da8883f..98ca7302 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -9,7 +9,7 @@ jobs:
 
     steps:
     - name: Check out repository code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup Python
       uses: actions/setup-python@v4
diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
index e5cdbd2a..a7559f07 100644
--- a/.github/workflows/style.yml
+++ b/.github/workflows/style.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with: