diff --git a/.github/workflows/stg-backend.yml b/.github/workflows/stg-backend.yml
index 533bcbf..e117e0f 100644
--- a/.github/workflows/stg-backend.yml
+++ b/.github/workflows/stg-backend.yml
@@ -117,7 +117,7 @@ jobs:
           app: ${{ env.APP }}
 
       - name: Staging undeploy
-        if: github.event_name == 'pull_request' && github.event.action == 'closed' && startsWith(github.head_ref, 'release') != true
+        if: github.event_name == 'pull_request_target' && github.event.action == 'closed' && github.event.pull_request.merged == true && startsWith(github.head_ref, 'release') != true
         uses: aeternity/ae-github-actions/argocd-undeploy@v5
         with:
           url-prefix: pr-${{ env.PR_NUMBER }}
diff --git a/.github/workflows/stg-frontend.yml b/.github/workflows/stg-frontend.yml
index 73cf52c..c3fa2bb 100644
--- a/.github/workflows/stg-frontend.yml
+++ b/.github/workflows/stg-frontend.yml
@@ -126,7 +126,7 @@ jobs:
           app: ${{ env.APP }}
 
       - name: Staging undeploy
-        if: github.event_name == 'pull_request' && github.event.action == 'closed' && startsWith(github.head_ref, 'release') != true
+        if: github.event_name == 'pull_request_target' && github.event.action == 'closed' && github.event.pull_request.merged == true && startsWith(github.head_ref, 'release') != true
         uses: aeternity/ae-github-actions/argocd-undeploy@v5
         with:
           url-prefix: pr-${{ env.PR_NUMBER }}