If I'm using CodeIgniter with Composer, how can dependency conflicts lead to HTTP 500 errors, and how can I resolve them?

Dependency conflicts (e.g., incompatible versions of packages) can cause unexpected errors. Run `composer update` to try and resolve the conflicts. If that doesn't work, carefully examine the error messages to identify the conflicting packages and try downgrading or upgrading them individually until the conflict is resolved. Using a specific version constraint in your `composer.json` can prevent future conflicts.