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claude-code - 💡(How to fix) Fix [FEATURE] Enable Ruby 3.4+ in claude code web sandboxes [1 participants]

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anthropics/claude-code#46109•Fetched 2026-04-11 06:28:47
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Fix Action

Workaround

None for now. Due to strict version locking we can't relax our ruby version on our project

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Preflight Checklist

  • I have searched existing requests and this feature hasn't been requested yet
  • This is a single feature request (not multiple features)

Problem Statement

Request

Please add Ruby 3.4.x and 4.0.x (ideally the latest 3.4 patch release) to the sandbox base image, following the same pattern as the existing installations under /opt/ruby-* and registered with rbenv.

Ruby 3.4.0 was released December 2024 and is now the current stable series. Many production Rails applications have adopted it.

Workaround

None for now. Due to strict version locking we can't relax our ruby version on our project

Environment

  • Platform: Claude Code on the web (remote sandbox)
  • OS: Ubuntu 24.04 (x86_64)
  • rbenv installed at /opt/rbenv
  • ruby-build plugin available but cannot download sources

Proposed Solution

Allow 3.4+ versions in the sandbox

Alternative Solutions

Use Claude code locally

Priority

Medium - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

No response

Additional Context

No response

extent analysis

TL;DR

Add Ruby 3.4.x and 4.0.x to the sandbox base image by installing them under /opt/ruby-* and registering with rbenv.

Guidance

  • Verify the current Ruby versions installed in the sandbox by checking the /opt/ruby-* directory and running rbenv versions.
  • Check the ruby-build plugin configuration to see if it can be updated to download sources for Ruby 3.4.x and 4.0.x.
  • Consider using a local Claude code setup as a temporary workaround, as suggested in the Alternative Solutions section.
  • Test the installation of Ruby 3.4.x and 4.0.x in a non-production environment before applying the change to the sandbox base image.

Example

No code snippet is provided as it is not clearly supported by the issue.

Notes

The solution may require updates to the ruby-build plugin or changes to the sandbox base image configuration. The issue does not provide enough information about the specific steps required to install Ruby 3.4.x and 4.0.x.

Recommendation

Apply workaround: Use Claude code locally until the Ruby versions are updated in the sandbox base image, as this allows for immediate progress on the blocked work.

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