diff --git a/.github/workflows/CIRunner.yml b/.github/workflows/CIRunner.yml
index 77074cc7..6bf41f3a 100644
--- a/.github/workflows/CIRunner.yml
+++ b/.github/workflows/CIRunner.yml
@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ inputs.python-version }}
       uses: actions/setup-python@v4
diff --git a/.github/workflows/UnitTestRunner.yml b/.github/workflows/UnitTestRunner.yml
index 55d458f8..86e65709 100644
--- a/.github/workflows/UnitTestRunner.yml
+++ b/.github/workflows/UnitTestRunner.yml
@@ -24,7 +24,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
     
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 622cd347..22a5de29 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/doc-release.yml b/.github/workflows/doc-release.yml
index 6b8afae1..0cf86d58 100644
--- a/.github/workflows/doc-release.yml
+++ b/.github/workflows/doc-release.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       
       - name: Set up Python ${{ fromJson(needs.variables.outputs.python-versions)[0] }}
         uses: actions/setup-python@v4