diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 84ccb26..bd1108d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -21,7 +21,7 @@ jobs:
           fetch-depth: 0
       - name: Set up Python ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
       - name: Generate partial Python venv restore key
@@ -82,7 +82,7 @@ jobs:
           fetch-depth: 0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Generate partial Python venv restore key
@@ -122,7 +122,7 @@ jobs:
         uses: actions/checkout@v2.4.0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
@@ -162,7 +162,7 @@ jobs:
         uses: actions/checkout@v2.4.0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
@@ -207,7 +207,7 @@ jobs:
           fetch-depth: 0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Generate partial Python venv restore key
@@ -251,7 +251,7 @@ jobs:
         uses: actions/checkout@v2.4.0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment
@@ -277,7 +277,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["pypy3"]
+        python-version: ["pypy3.8"]
     outputs:
       python-key: ${{ steps.generate-python-key.outputs.key }}
     steps:
@@ -287,7 +287,7 @@ jobs:
           fetch-depth: 0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Generate partial Python venv restore key
@@ -327,7 +327,7 @@ jobs:
         uses: actions/checkout@v2.4.0
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Restore Python virtual environment