diff --git a/.github/workflows/autorelease.yml b/.github/workflows/autorelease.yml
index aafcd8b..7e8f86b 100644
--- a/.github/workflows/autorelease.yml
+++ b/.github/workflows/autorelease.yml
@@ -18,6 +18,8 @@ jobs:
           python-version: 3.8
       - name: Set up PDM
         uses: pdm-project/setup-pdm@v3
+        with:
+          version: 2.20.1
 
       - name: Install dependencies
         run: pdm install -dG release
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index dfc09ae..8347c24 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -13,6 +13,8 @@ jobs:
       - uses: actions/checkout@v3
       - name: Set up PDM
         uses: pdm-project/setup-pdm@v3
+        with:
+          version: 2.20.1
 
       - name: Publish package distributions to PyPI
         run: pdm publish
diff --git a/.github/workflows/python-linters.yml b/.github/workflows/python-linters.yml
index 1a1efa7..c4a4f53 100644
--- a/.github/workflows/python-linters.yml
+++ b/.github/workflows/python-linters.yml
@@ -18,6 +18,7 @@ jobs:
         uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+          version: 2.20.1
 
       - name: Install dependencies
         run: |
diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index ba54f03..40b1222 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -19,6 +19,7 @@ jobs:
         uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+          version: 2.20.1
 
       - name: Install dependencies
         run: |