Python Bumpversion Release — ELI5

Imagine your favorite game gets an update. Somewhere, a developer had to change the version number from “2.3” to “2.4.” But the version number isn’t in just one place — it’s in the app’s title screen, the download page, the settings menu, and a hidden config file. If they update three of those but forget the fourth, players might see different version numbers in different places and get confused.

Bumpversion (now called bump-my-version) is a tool that finds every place the version number appears and updates them all at once. You tell it which files contain the version number, and then you run a single command: “bump the minor version.” It changes “2.3.0” to “2.4.0” everywhere simultaneously.

It also creates a bookmark in your code history (called a Git tag) so you can always go back and see exactly what the code looked like at version 2.4.0. Think of it like putting a flag in a timeline — “this is the moment version 2.4 was born.”

Without a tool like this, developers either forget to update some files or accidentally type the wrong number. Bumpversion removes both problems by being the single source of truth: you tell it “bump,” and it handles the rest.

One thing to remember: Bumpversion is a version number remote control — press one button, and every file updates together.