diff --git a/.github/codecov.yml b/.github/codecov.yml
index e9b99c82..e9b2ef7c 100644
--- a/.github/codecov.yml
+++ b/.github/codecov.yml
@@ -7,6 +7,8 @@ coverage:
     patch:
       default:
         target: 100
+  ignore:
+    - "numcodecs/tests/**"
 comment:
   layout: "diff, files"
   behavior: default
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2c6a5350..a0b3b977 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -100,4 +100,10 @@ jobs:
 
       - name: Run tests with Zarr ${{ matrix.zarr-version }}
         shell: "bash -l {0}"
-        run: pixi run test-zarr-${{ matrix.zarr-version }}
\ No newline at end of file
+        run: pixi run test-zarr-${{ matrix.zarr-version }}
+
+      - uses: codecov/codecov-action@v5
+        with:
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
+          verbose: true
diff --git a/pyproject.toml b/pyproject.toml
index db2f3b61..b3017991 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -284,9 +284,9 @@ test-google-crc32c = ["test", "test-google-crc32c"]
 ls-deps-312 = "uv run --group test-zarr-312 uv pip freeze"
 ls-deps-313 = "uv run --group test-zarr-313 uv pip freeze"
 ls-deps-main = "uv run --group test-zarr-main uv pip freeze"
-test-zarr-312 = "uv run --group test-zarr-312 pytest numcodecs/tests/test_zarr3.py numcodecs/tests/test_zarr3_import.py"
-test-zarr-313 = "uv run --group test-zarr-313 pytest numcodecs/tests/test_zarr3.py numcodecs/tests/test_zarr3_import.py"
-test-zarr-main = "uv run --group test-zarr-main pytest numcodecs/tests/test_zarr3.py numcodecs/tests/test_zarr3_import.py"
+test-zarr-312 = "uv run --group test-zarr-312 pytest --cov=numcodecs --cov-report=xml --cov-report=term numcodecs/tests/test_zarr3.py numcodecs/tests/test_zarr3_import.py"
+test-zarr-313 = "uv run --group test-zarr-313 pytest --cov=numcodecs --cov-report=xml --cov-report=term numcodecs/tests/test_zarr3.py numcodecs/tests/test_zarr3_import.py"
+test-zarr-main = "uv run --group test-zarr-main pytest --cov=numcodecs --cov-report=xml --cov-report=term numcodecs/tests/test_zarr3.py numcodecs/tests/test_zarr3_import.py"
 
 [tool.pixi.feature.test.tasks]
 run-tests = "pytest -v"