diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 71aaefb..39e3412 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 3848243..ed81de5 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -7,7 +7,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Publish python poetry package
         uses: JRubics/poetry-publish@v1.9
         with:
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 101e9cb..0a29734 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -24,7 +24,7 @@ jobs:
       #----------------------------------------------
       #       check-out repo and set-up python
       #----------------------------------------------
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}