diff --git a/_examples/real-world-examples/server-sent-events/server/public/index.html b/_examples/real-world-examples/server-sent-events/server/public/index.html
index 304a10251..6686f9782 100644
--- a/_examples/real-world-examples/server-sent-events/server/public/index.html
+++ b/_examples/real-world-examples/server-sent-events/server/public/index.html
@@ -44,10 +44,10 @@
 
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+<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
 
-<script src="https://unpkg.com/vue/dist/vue.js"></script>
-<script src="https://unpkg.com/vue-router/dist/vue-router.js"></script>
+<script src="https://unpkg.com/vue@2.7.16/dist/vue.js"></script>
+<script src="https://unpkg.com/vue-router@3.6.5/dist/vue-router.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/vue-resource@1.3.5"></script>
 
 <script type="text/x-template" id="feeds-list">