Upgrading jQuery Library form 1.7.1 to 1.10.1 not working

Upgrading jQuery Library form 1.7.1 to 1.10.1 not working

I have developed a web application by using jQuery 1.7.1. Now I am trying
to switch to jQuery 1.10.2 but it isn't working.
Upon using the latest version, none of my existing jQuery code works.
I am using the Google-hosted version of jQuery:
<script
src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
Is it OK to stay with 1.7.1? How can I upgrade to 1.10.2?
I am getting the following messages in my browser's console:
Use of Mutation Events is deprecated. Use MutationObserver instead.
The Web Console logging API (console.log, console.info, console.warn,
console.error) has been disabled by a script on this page.