How To Upgrade Jquery Version In Existing Project

Upgrading the jQuery version in your existing project can be essential to improve performance, fix bugs, and take advantage of new features. However, upgrading jQuery can also cause compatibility issues with your existing code. So it is important to follow a systematic approach to ensure a smooth transition. In this article, we will discuss how to upgrade the jQuery version in an existing project step by step.

Step 1: Identifying the Current jQuery Version

Before you begin the upgrade process, it’s essential to identify the current version of jQuery in your project. You can find this information in the jQuery file being used in your project, usually named as jquery.js or jquery.min.js. The version number is usually mentioned in the comments at the beginning of the file.

Alternatively, you can also check the version by typing the following command in your browser’s JavaScript console:


Step 2: Choose the Target jQuery Version

Once you have identified the current jQuery version, you should decide which version you want to upgrade to. We recommend always upgrading to the latest stable version, which can be found on the official jQuery website at

Step 3: Download the New jQuery Version

Download the new jQuery version from the official website. You can choose between the compressed (minified) version or the uncompressed version. The compressed version is recommended for production use, while the uncompressed version is suitable for development or debugging.

Step 4: Replace the Existing jQuery File

Once you have downloaded the new jQuery version, replace the existing jQuery file in your project with the new one. Make sure to update the file reference in your HTML files accordingly. For example:

<script src="js/jquery-3.6.0.min.js"></script>

Step 5: Test Your Project

After replacing the jQuery file, you must thoroughly test your project to ensure that everything works as expected. This includes testing all the functionalities that use jQuery, checking for JavaScript errors in the browser console, and verifying if any plugins or libraries are compatible with the new jQuery version.

Step 6: Use the jQuery Migrate Plugin

If you encounter any issues after upgrading the jQuery version, you can use the jQuery Migrate plugin to help you identify and fix compatibility issues. The plugin will restore deprecated features and behaviors removed in newer jQuery versions, making it easier to update your code progressively.

To use the jQuery Migrate plugin, download it from and include it in your project right after the new jQuery file:

<script src="js/jquery-3.6.0.min.js"></script>
<script src="js/jquery-migrate-3.3.2.min.js"></script>

With the plugin included, you can check the browser console for any warnings or errors related to deprecated features or compatibility issues.

Step 7: Update Your Code

Based on the console warnings or errors provided by the jQuery Migrate plugin, update your code to remove the deprecated features and make it compatible with the new jQuery version. This may involve updating plugins, libraries, or rewriting some parts of your code.

Step 8: Test and Deploy

Once you have updated your code, test your project thoroughly again to ensure everything works correctly. If all functionalities work as expected and there are no compatibility issues, you can deploy your project with the upgraded jQuery version.

Upgrading the jQuery version in an existing project can be a challenging task, but following these steps systematically will help you ensure a smooth transition. Always remember to test your project extensively to avoid any unexpected issues after the upgrade.