diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3196f88..bb81def 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
@@ -55,7 +55,7 @@ jobs:
     steps:
       - uses: actions/checkout@master
       - name: Set up Python 3.8
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f965299..9eb7fc5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
@@ -43,7 +43,7 @@ jobs:
     steps:
       - uses: actions/checkout@master
       - name: Set up Python 3.8
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8
 
diff --git a/.github/workflows/serve-docs.yml b/.github/workflows/serve-docs.yml
index 54b84cc..6d8cc1a 100644
--- a/.github/workflows/serve-docs.yml
+++ b/.github/workflows/serve-docs.yml
@@ -13,7 +13,7 @@ jobs:
             echo "PYTHONPATH=/home/runner/work/py2k/py2k" >> $GITHUB_ENV
             echo "/home/runner/work/py2k/py2k/py2k" >> $GITHUB_PATH
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
         with:
           python-version: 3.6
       - run: |