diff --git a/.github/workflows/strain_dispatcher.yml b/.github/workflows/strain_dispatcher.yml
index aa8081e8..5d1a4611 100644
--- a/.github/workflows/strain_dispatcher.yml
+++ b/.github/workflows/strain_dispatcher.yml
@@ -11,10 +11,10 @@ jobs:
       - name: checkout repo
         uses: actions/checkout@v3
         with:
-          -ref: ${{ github.event.pull_request.head.sha}}
+          ref: ${{ github.sha }}
       - name: get last commit name
         run: |
-          LAST_COMMIT_LOG=$(git show -s --format=%s)
+          LAST_COMMIT_LOG=$(git log -1 --no-merges --pretty=format:"%s")
           echo "LAST_COMMIT_LOG=${LAST_COMMIT_LOG}" >> $GITHUB_ENV # update GitHub ENV vars
       - name: Log of last commit of the PR is
         run: echo "${{ env.LAST_COMMIT_LOG }}"
@@ -29,7 +29,7 @@ jobs:
             {
               "repo": "${{ github.repository }}",
               "ref": "${{ github.ref }}",
-              "sha": "${{ github.event.pull_request.head.sha }}",
+              "sha": "${{ github.sha }}",
               "ref_name": "${{ github.ref_name }}",
               "head_ref": "${{ github.head_ref }}",
               "base_ref": "${{ github.base_ref }}",