diff --git a/.github/workflows/run_tests_matlab.yml b/.github/workflows/run_tests_matlab.yml
index 5fd3d6c..8cc4c7e 100644
--- a/.github/workflows/run_tests_matlab.yml
+++ b/.github/workflows/run_tests_matlab.yml
@@ -53,7 +53,7 @@ jobs:
         command: cd(fullfile(getenv('GITHUB_WORKSPACE'), '.github', 'workflows')); run tests_matlab;
 
     - name: Code coverage
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: coverage.xml
         flags: ${{ matrix.os }}_matlab-${{ matrix.version }}
diff --git a/.github/workflows/run_tests_octave.yml b/.github/workflows/run_tests_octave.yml
index 4a01345..1a5ec81 100644
--- a/.github/workflows/run_tests_octave.yml
+++ b/.github/workflows/run_tests_octave.yml
@@ -42,7 +42,7 @@ jobs:
         cover_xml_file: coverage.xml
 
     - name: Code coverage
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: coverage.xml
         flags: octave