diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7badbc2..5e33f36 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -15,7 +15,7 @@ jobs:
         python-version: [3.8, 3.9]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
diff --git a/.github/workflows/helm.yml b/.github/workflows/helm.yml
index 335467f..28678d7 100644
--- a/.github/workflows/helm.yml
+++ b/.github/workflows/helm.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3.1.0
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index a0c7c95..df623f0 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -10,7 +10,7 @@ jobs:
     name: Build and publish Python 🐍 distributions 📦 to PyPI and TestPyPI
     runs-on: ubuntu-18.04
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v3.1.0
     - name: Set up Python 3.7
       uses: actions/setup-python@v1
       with: