diff --git a/.github/workflows/czicompress_cmake.yml b/.github/workflows/czicompress_cmake.yml
index ad40c91..bd27554 100644
--- a/.github/workflows/czicompress_cmake.yml
+++ b/.github/workflows/czicompress_cmake.yml
@@ -87,13 +87,14 @@ jobs:
         run: OpenCppCoverage.exe --export_type cobertura:${{github.workspace}}\TestResults\coverage.xml --sources "${{github.workspace}}\czicompress" --excluded_sources "${{github.workspace}}\czicompress\tests" --modules czicompress -- czicompress_tests.exe
 
       - name: Upload Coverage
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         if: ${{ (matrix.config.os == 'windows-latest') && (matrix.build == 'Debug') }}
         with:
           files: coverage.xml
           fail_ci_if_error: true
           directory: ${{ github.workspace }}/TestResults
           verbose: true
+          token: ${{ secrets.CODECOV_TOKEN }} # required
 
       - name: Prepare licenses
         if: matrix.build == 'Release'
diff --git a/.github/workflows/czishrink_dotnet.yml b/.github/workflows/czishrink_dotnet.yml
index e7944f8..d50ed13 100644
--- a/.github/workflows/czishrink_dotnet.yml
+++ b/.github/workflows/czishrink_dotnet.yml
@@ -101,12 +101,13 @@ jobs:
 
       - name: Upload coverage reports for czishrink to Codecov
         if: ${{ (matrix.config.os == 'ubuntu-latest') && (matrix.build == 'Debug') }}
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           fail_ci_if_error: true
           directory: ${{ github.workspace }}/TestResults
           files: coverage.cobertura.xml
           verbose: true
+          token: ${{ secrets.CODECOV_TOKEN }} # required
 
       - name: Upload dotnet test results
         uses: actions/upload-artifact@v4