diff --git a/.github/workflows/matlab_test_and_coverage.yaml b/.github/workflows/matlab_test_and_coverage.yml
similarity index 96%
rename from .github/workflows/matlab_test_and_coverage.yaml
rename to .github/workflows/matlab_test_and_coverage.yml
index ecaca35..75cfd89 100644
--- a/.github/workflows/matlab_test_and_coverage.yaml
+++ b/.github/workflows/matlab_test_and_coverage.yml
@@ -62,9 +62,10 @@ jobs:
       if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'
       # no coverage on windows as long as MOcov does not support it
       # see https://github.com/MOcov/MOcov/issues/28
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: coverage.xml   # optional
         flags: ${{ matrix.os }}_matlab-${{ matrix.version }}
         name: codecov-umbrella   # optional
         fail_ci_if_error: true   # optional (default = false)
+        token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.github/workflows/octave_test_and_coverage.yml b/.github/workflows/octave_test_and_coverage.yml
index 11aea83..2bc4a5d 100644
--- a/.github/workflows/octave_test_and_coverage.yml
+++ b/.github/workflows/octave_test_and_coverage.yml
@@ -26,7 +26,7 @@ jobs:
         cover_xml_file: coverage.xml
 
     - name: Code coverage
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}   # not required for public repos
         file: coverage.xml   # optional