Fix Heroku Deployment Issue

I'm currently facing a build failure while deploying my Python API on Heroku. The issue seems to stem from dependency installation failures, and I'm using Pip as the build tool.

Key Requirements:
- Expertise in Python and Heroku
- Proficient in Pip and troubleshooting build issues
- Ability to resolve dependency installation errors

I need someone who can quickly diagnose and fix this issue so I can get my API up and running.