diff --git a/.github/workflows/auto-update-db.yml b/.github/workflows/auto-update-db.yml
index 423dbe1..d23953d 100644
--- a/.github/workflows/auto-update-db.yml
+++ b/.github/workflows/auto-update-db.yml
@@ -35,10 +35,10 @@ jobs:
         uses: ahmadnassri/action-workflow-queue@v1
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: database
           path: database
diff --git a/.github/workflows/python-flake8.yml b/.github/workflows/python-flake8.yml
index 19bcdb9..4b0d308 100644
--- a/.github/workflows/python-flake8.yml
+++ b/.github/workflows/python-flake8.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4  # https://github.com/actions/setup-python
diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index b0fcff9..708a532 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/update-pages.yml b/.github/workflows/update-pages.yml
index 64f8ec3..56a0089 100644
--- a/.github/workflows/update-pages.yml
+++ b/.github/workflows/update-pages.yml
@@ -21,10 +21,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Checkout database
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: database
           path: database
@@ -83,16 +83,16 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Checkout database
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: database
           path: database
 
       - name: Checkout gh-pages
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
           path: gh-pages