diff --git a/.github/workflows/main_ci.yml b/.github/workflows/main_ci.yml
index 3f395ae..4153922 100644
--- a/.github/workflows/main_ci.yml
+++ b/.github/workflows/main_ci.yml
@@ -11,7 +11,7 @@ jobs:
         python-version: [3.8]
 
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4.0.0
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2.2.2
       with:
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.0.0
       - name: Prepare
         id: prep
         run: |
diff --git a/.github/workflows/tagged_ci.yml b/.github/workflows/tagged_ci.yml
index 306dd98..71e5538 100644
--- a/.github/workflows/tagged_ci.yml
+++ b/.github/workflows/tagged_ci.yml
@@ -12,7 +12,7 @@ jobs:
         python-version: [3.8]
 
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4.0.0
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2.2.2
       with:
@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.0.0
       - name: Prepare
         id: prep
         run: |