diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 5d17538..21cc955 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -40,9 +40,9 @@ jobs:
 
       - name: Upload coverage to Codecov
         if: matrix.python-version == '3.10'
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
-          file: ./coverage.xml
+          files: ./coverage.xml  # Changed from 'file' to 'files'
           flags: unittests
           name: codecov-umbrella
           fail_ci_if_error: false