diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 76d4794..0b3b156 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,6 +4,7 @@ on:
   pull_request:
   push:
     branches: [master]
+  workflow_dispatch:
 
 jobs:
   test:
@@ -27,6 +28,8 @@ jobs:
           - os: macos-latest
             python-version: '3.9'
             coverage: false
+    env:
+      PYTEST_ADDOPTS: -n 5 -m 'slow or not slow'
     steps:
 
       - name: Checkout repo
@@ -50,15 +53,21 @@ jobs:
         env:
           TZ: ${{ matrix.tz }}
         run: |
-          PYTEST_ARGS=(-n 2 -m 'slow or not slow')
           if ${{ matrix.coverage }}; then
-            PYTEST_ARGS+=('--cov=metomi/isodatetime')
+            PYTEST_ADDOPTS="${PYTEST_ADDOPTS} --cov=metomi/isodatetime"
           fi
 
-          pytest "${PYTEST_ARGS[@]}"
+          pytest
 
-      - name: Upload coverage report
+      - name: Coverage report
         if: matrix.coverage
         run: |
-          coverage xml --ignore-errors
-          bash <(curl -s https://codecov.io/bash)
+          coverage xml
+          coverage report
+
+      - name: Codecov upload
+        if: matrix.coverage
+        uses: codecov/codecov-action@v2
+        with:
+          name: '${{ matrix.os }} py-${{ matrix.python-version }}'
+          fail_ci_if_error: true