diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index 1bc081b..bb096a1 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -9,7 +9,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up Python 3.7
       uses: actions/setup-python@v4