diff --git a/.github/workflows/black-and-deploy.yml b/.github/workflows/black-and-deploy.yml
index f850629b..3c62449e 100644
--- a/.github/workflows/black-and-deploy.yml
+++ b/.github/workflows/black-and-deploy.yml
@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:  # https://github.com/stefanzweifel/git-auto-commit-action#checkout-the-correct-branch
             ref: ${{ github.head_ref }}
       - uses: actions/setup-python@v4
@@ -26,10 +26,10 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run a one-line script
         run: echo Hello, world!
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: copy file via ssh password
         uses: appleboy/scp-action@master
         with:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 11387c51..1b786cf6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ jobs:
         os: [macOS-latest, ubuntu-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/pypi_upload.yml b/.github/workflows/pypi_upload.yml
index ed434bd8..a8162721 100644
--- a/.github/workflows/pypi_upload.yml
+++ b/.github/workflows/pypi_upload.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up latest Python
         uses: actions/setup-python@v4