Ruby Academy · Lesson

Publishing to RubyGems

Release your gem.

Publishing to RubyGems is a free Ruby Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Ruby Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

What Is RubyGems.org?

RubyGems.org is the public host where Ruby gems are published and downloaded. When you run gem install or bundle install, it fetches packages from there by default.

Publishing makes your gem installable worldwide.
Each gem name is unique and first-come.
Once a version is published it should be treated as permanent.

Create an Account

Before publishing you need a free RubyGems.org account. You then sign in from the command line so the gem tool can authenticate your uploads. Credentials are stored locally for future pushes.

Pre-Flight Checklist

Before releasing, confirm:

The version number is bumped.
Tests pass.
The changelog is updated.
The gemspec lists all files and the correct license.

A few minutes of checking prevents a broken public release.

checklist = ["version bumped", "tests pass", "changelog updated", "gemspec valid"]
checklist.each { |item| puts "[ ] " + item }

Build the Package

Run gem build mygem.gemspec. This reads the gemspec and produces a file like mygem-0.1.0.gem containing your code and metadata. This is the exact artifact that gets uploaded.

Test the Build Locally

Install the built file into a clean environment with gem install ./mygem-0.1.0.gem and try requiring it. This catches missing files or load errors before the whole world can see them.

Push to RubyGems

Publish with gem push mygem-0.1.0.gem. Within moments the version appears on RubyGems.org and anyone can install it. The command uses your stored credentials to authorize the upload.

Releasing with Rake

Gems scaffolded by Bundler include a rake release task. It tags the version in git, builds the gem, and pushes it in one step, so the git tag and published version always match.

You Cannot Re-Push a Version

Once 1.0.0 is published you cannot overwrite it with different code. To fix a problem you must publish a new version like 1.0.1. This guarantees that a given version is always the same bytes for every user.

published = "1.0.0"
fix = "1.0.1"
puts "Cannot overwrite " + published
puts "Publish " + fix + " instead"

Yanking a Bad Release

If a version is broken or unsafe, gem yank mygem -v 1.0.1 removes it from new installs. Existing lockfiles may still reference it, so yanking is a last resort, not an undo button.

Securing Your Account

Protect your gem from hijacking:

Enable multi-factor authentication on RubyGems.org.
Use scoped API keys with limited permissions.
Add trusted co-owners with gem owner so the gem survives if you step away.

After Publishing

Once live, share the install instructions in your README, announce the release, and watch for issues. Respond to bug reports with patch releases. A maintained gem builds trust and adoption over time.

Quick Check

Test your understanding of publishing.

Recap: Publishing to RubyGems

You learned the release workflow:

Create an account and sign in.
Run a pre-flight checklist, then gem build.
Test locally, then gem push (or rake release).
Versions are permanent; publish fixes as new versions or gem yank.
Secure your account with MFA and co-owners.

That completes the Building Your Own Ruby Gem course.

Frequently asked questions

Is the “Publishing to RubyGems” lesson free?

Yes — the full text of “Publishing to RubyGems” is free to read here on the web, and the Ruby Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Ruby Academy course, upgrade to CoddyKit PRO.

What will I learn in “Publishing to RubyGems”?

Release your gem. You practise Ruby Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Ruby Academy?

No prior experience is required. Ruby Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Publishing to RubyGems” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Ruby Academy lesson?

Yes. Every Ruby Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

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