diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5de8657a..e39aa6bf 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -107,7 +107,7 @@ jobs:
           pytest -v ../test --cov=../cmdstanpy
 
       - name: Submit codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           verbose: true