diff --git a/.github/workflows/testsuite.yaml b/.github/workflows/testsuite.yaml
index 49bae97..e53e670 100644
--- a/.github/workflows/testsuite.yaml
+++ b/.github/workflows/testsuite.yaml
@@ -46,7 +46,7 @@ jobs:
         run: |
           python -m pytest --cov=py21cmsense --cov-config=.coveragerc --cov-report xml:./coverage.xml --junitxml=test-reports/xunit.xml
 
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         if: success()
         with:
           file: ./coverage.xml #optional