diff --git a/.github/workflows/test_core.yml b/.github/workflows/test_core.yml
index 5b534e25..f4c020b5 100644
--- a/.github/workflows/test_core.yml
+++ b/.github/workflows/test_core.yml
@@ -12,7 +12,7 @@ jobs:
       #       check-out repo and set-up python
       #----------------------------------------------
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up python
         id: setup-python
         uses: actions/setup-python@v4