diff --git a/.github/workflows/seo-report.yaml b/.github/workflows/seo-report.yaml
index 6f26359..db8f151 100644
--- a/.github/workflows/seo-report.yaml
+++ b/.github/workflows/seo-report.yaml
@@ -20,6 +20,16 @@ jobs:
       url: https://${{ github.repository_owner }}.github.io/${{ github.head_ref }}/
     runs-on: ubuntu-latest
     steps:
+      - name: Get Deployment Source Branch Name
+        id: git-branch
+        run: |
+          git branch -a --contains ${{ github.event.deployment.ref }}
+          source_branches="$(git branch -a --contains ${{ github.event.deployment.ref }})"
+          result=$(echo "$source_branches" | tail -n1 | sed 's/^[ \t]*//')
+          echo "Remote source of deployment: ${result}"
+          echo "Local git ref of deployment: ${result#remotes/origin/*}"
+          echo "SOURCE_REF=${result#remotes/origin/*}" >> "$GITHUB_OUTPUT"
+
       - name: Check out
         uses: actions/checkout@v3
 
@@ -31,18 +41,6 @@ jobs:
       - name: Install Dependencies
         run: yarn global add @unlighthouse/cli puppeteer
 
-      - name: Get Deployment Source Branch Name
-        id: git-branch
-        run: |
-          commit_sha=$(curl -s -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
-            "https://api.github.com/repos/${{ github.repository }}/deployments/${{ github.event.deployment.id }}" \
-            | jq -r '.sha')
-          branch=$(curl -s -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
-            "https://api.github.com/repos/${{ github.repository }}/commits/$commit_sha" \
-            | jq -r '.ref' | sed 's/refs\/heads\///')
-          echo "Source branch of deployment: $branch"
-          echo "SOURCE_REF=$branch" >> "$GITHUB_ENV"
-
       - name: Build Unlighthouse report
         run: |
           unlighthouse-ci \