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https://github.com/jbranchaud/til
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33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
# Check Ruby Version For Production App
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While deploying a fresh Rails app to Heroku recently, I ran into an issue. The
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`it` block argument wasn't working despite being on Ruby 4.0. Or so I thought.
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Running the following command reported the Ruby version of that Heroku server
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instance:
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```bash
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❯ heroku run -- ruby --version
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Running ruby --version on ⬢ my-app... up, run.3090
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ruby 3.3.9 (2025-07-24 revision f5c772fc7c) [x86_64-linux]
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```
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I was on `3.3.9` which must have been the fallback default at the time.
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Though I had set the Ruby version in my `.ruby-version` file, I had neglected to
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specify it in the `Gemfile` as well. Once I added it to the `Gemfile` and
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redeployed, my Heroku server instance was running the expected version of Ruby.
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```bash
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❯ heroku run -- ruby --version
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Running ruby --version on ⬢ my-app... up, run.5353
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ruby 4.0.0 (2025-12-25 revision 553f1675f3) +PRISM [x86_64-linux]
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```
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Note: because [I have set `HEROKU_ORGANIZATION` and
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`HEROKU_APP`](set-default-team-and-app-for-project.md) in my environment
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(`.envrc`) for the local copy of the app, I don't need to specify those when
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running the `heroku run` command above.
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See `heroku run --help` for more details.
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