diff --git a/.github/workflows/matrix-and-codecov-on-merge-to-main.yml b/.github/workflows/matrix-and-codecov-on-merge-to-main.yml
index 1a8c6ce..da1e7b7 100644
--- a/.github/workflows/matrix-and-codecov-on-merge-to-main.yml
+++ b/.github/workflows/matrix-and-codecov-on-merge-to-main.yml
@@ -17,5 +17,6 @@ jobs:
       project: diffpy.stretched-nmf
       c_extension: false
       headless: false
+      release_branch: main
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}