diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 012a3148..bbdd1fcc 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -40,7 +40,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/publish-pypi.yml b/.github/workflows/publish-pypi.yml
index 0c1230a7..724fbac7 100644
--- a/.github/workflows/publish-pypi.yml
+++ b/.github/workflows/publish-pypi.yml
@@ -27,7 +27,7 @@ jobs:
             github.com:443
             pypi.org:443
             upload.pypi.org:443
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
diff --git a/.github/workflows/remove-obsolete-cache.yml b/.github/workflows/remove-obsolete-cache.yml
index dbce6f82..a14e748d 100644
--- a/.github/workflows/remove-obsolete-cache.yml
+++ b/.github/workflows/remove-obsolete-cache.yml
@@ -24,7 +24,7 @@ jobs:
             objects.githubusercontent.com:443
 
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Cleanup
         run: |
diff --git a/.github/workflows/tag-testpypi.yml b/.github/workflows/tag-testpypi.yml
index e1d9ef0a..1ec15808 100644
--- a/.github/workflows/tag-testpypi.yml
+++ b/.github/workflows/tag-testpypi.yml
@@ -27,7 +27,7 @@ jobs:
             github.com:443
             pypi.org:443
             test.pypi.org:443
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with: