// Step 1: Download the latest version of CodeIgniter 3 from the official website.
// Step 2: Extract the downloaded zip file to your local machine.
// Step 3: Replace the existing CodeIgniter files in your project with the new files from the extracted folder, excluding your application and public folders.
// Step 4: Merge any custom changes you made in your application and public folders with the new version's corresponding files.
// Step 5: Check and update your database configuration if there have been changes in the newer version.
// Step 6: Review the CodeIgniter documentation for any specific upgrade instructions or deprecated features that need to be addressed in your code.
// Step 7: Test your application thoroughly to ensure everything is working as expected with the updated CodeIgniter version.