diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c13eab89..bf0e35b6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -59,14 +59,16 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+        with:
+          # For Codecov, we must also fetch the parent of the HEAD commit to
+          # be able to properly deal with PRs / merges
+          fetch-depth: 2
       - name: Setup julia
         uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.julia-version }}
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
-          file: ./lcov.info
-          flags: unittests
-          name: codecov-umbrella
+          token: ${{ secrets.CODECOV_TOKEN }}