diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7e79b5a3..1c74a29d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -42,7 +42,7 @@ jobs:
       run: |
         pytest --cov=casanovo tests/
     - name: Upload coverage to codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         fail_ci_if_error: true