diff --git a/.github/workflows/pull-request-preview.yml b/.github/workflows/pull-request-preview.yml
index 591d4e4..3483aed 100644
--- a/.github/workflows/pull-request-preview.yml
+++ b/.github/workflows/pull-request-preview.yml
@@ -51,7 +51,7 @@ jobs:
         with:
           route: POST /repos/:repository/deployments
           repository: ${{ github.repository }}
-          ref: "${{ github.event.pull_request.merge_commit_sha }}"
+          ref: ${{ github.event.pull_request.base.ref }}
           environment: dev
           auto_merge: false
           required_contexts: "[]"