diff --git a/.github/workflows/ci_testing.yml b/.github/workflows/ci_testing.yml
index 588dde2..c1728c2 100644
--- a/.github/workflows/ci_testing.yml
+++ b/.github/workflows/ci_testing.yml
@@ -71,7 +71,7 @@ jobs:
         coverage xml
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       if: always()
       # see: https://github.com/actions/toolkit/issues/399
       continue-on-error: true