diff --git a/apps/demo-nginx/Jenkinsfile b/apps/demo-nginx/Jenkinsfile
index 1567cc1..77cd974 100644
--- a/apps/demo-nginx/Jenkinsfile
+++ b/apps/demo-nginx/Jenkinsfile
@@ -440,22 +440,24 @@ EOF
                             echo ""
                             echo "2. Checking running pod images..."
 
-                            POD_IMAGES=$(kubectl get pods -n ${NAMESPACE} -l app=${APP_NAME} \
-                            -o jsonpath='{range .items[*]}{.spec.containers[0].image}{" "}{end}')
+                            def POD_IMAGES = sh(
+                                script: "kubectl get pods -n ${NAMESPACE} -l app=${APP_NAME} -o jsonpath='{range .items[*]}{.spec.containers[0].image}{\" \"}{end}'",
+                                returnStdout: true
+                            ).trim()
 
                             echo "   Running pod images:"
-                            echo "${POD_IMAGES}"
+                            echo "   ${POD_IMAGES}"
                             echo "   Expected tag: ${IMAGE_TAG}"
 
-                            if ! echo "${POD_IMAGES}" | grep -q "${IMAGE_TAG}"; then
-                                echo "   ❌ FAILED: Running pods do not use expected image!"
-                                exit 1
-                            fi
+                            if (!POD_IMAGES.contains(IMAGE_TAG)) {
+                                error("❌ FAILED: Running pods do not use expected image!")
+                            }
 
                             echo "   ✅ All running pods use expected image"
 
 
 
+
                             
                             # 3. CRITICAL: Verify actual running pod images
                             echo ""