diff --git a/.github/workflows/pypi.yaml b/.github/workflows/pypi.yaml
index 705eb05..548f0fc 100644
--- a/.github/workflows/pypi.yaml
+++ b/.github/workflows/pypi.yaml
@@ -9,7 +9,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 44a4525..4b1e761 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -41,7 +41,7 @@ jobs:
             PerlChemistry: "/home/runner/work/nano-CAT/nano-CAT/MATCH/PerlChemistry"
 
         steps:
-            -   uses: actions/checkout@v3
+            -   uses: actions/checkout@v4
 
             -   name: Install cp2k
                 if: matrix.os == 'ubuntu-latest'
@@ -113,7 +113,7 @@ jobs:
     Linting:
         runs-on: ubuntu-latest
         steps:
-            -   uses: actions/checkout@v3
+            -   uses: actions/checkout@v4
 
             -   name: Set up Python on ubuntu-latest
                 uses: actions/setup-python@v4