diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 437d5284..7b2cb17a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
     steps:
 
       - name: Checkout Code Repository
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@v4.0.0
 
       - name: Set up Python 3.9
         uses: actions/setup-python@v4
@@ -67,7 +67,7 @@ jobs:
     steps:
 
       - name: Checkout Code Repository
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@v4.0.0
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
@@ -100,7 +100,7 @@ jobs:
    
     steps:
       - name: Checkout Code Repository
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@v4.0.0
 
       - name: Set up Python 3.8
         uses: actions/setup-python@v4
@@ -135,7 +135,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@v4.0.0
 
       - name: Set up Python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/combine-prs.yml b/.github/workflows/combine-prs.yml
index 85bbb8a2..8270b47a 100644
--- a/.github/workflows/combine-prs.yml
+++ b/.github/workflows/combine-prs.yml
@@ -95,7 +95,7 @@ jobs:
             console.log('Combined: ' + combined);
             return combined
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v4.0.0
         with:
           fetch-depth: 0
       # Creates a branch with other PR branches merged together