Compatibility requirements for Rails LTS include supported Rails, Ruby, Bundler, and database versions before upgrading an existing application.

Rails LTS installation varies by Rails version; separate guides exist for 2.3, 3.2, 4.2, 5.2, 6.1, and 7.2, plus update instructions for existing installs.

Rails 2.3 apps can switch to Rails 2.3 LTS for maintained patches and optional security hardening, with Bundler-based installation and legacy dependency adjustments.

Rails 2.3 LTS installation without Bundler for legacy apps, including gem replacement, version pinning, and optional security changes.

Replace official Rails 3.2 gems with Rails 3.2 LTS to keep legacy applications maintainable, with subscription credentials, Bundler compatibility, and optional security hardening.

Rails 4.2 applications can be moved to Rails 4.2 LTS by swapping gems and configuring private package access for continued patches and optional security hardening.

Swap the official Rails 5.2 gems for Rails 5.2 LTS to keep an older app receiving patched releases, using private gem server credentials and Bundler configuration.

Swap the official Rails 6.1 gems for Rails 6.1 LTS by updating Bundler credentials and gem source, then verify compatibility and deploy normally.

Switching a Rails 7.2 app to Rails LTS replaces official gems with a maintained subscription build, keeping compatibility with the latest Rails 7.2 release.

Rails LTS offers optional hardening settings to reduce XSS, query ambiguity, and parameter-parsing risks in older Rails applications.

Updating a Rails LTS app to a newer gem version can require bundle update rails and a cleanup of legacy version pinning in config/environment.rb.

Find the installed Rails LTS release by checking the gem path, gem list, or RailsLts::VERSION; older installs may lack version reporting.

Rails 2.3 LTS can run with RubyGems 2+ when Bundler is used, but gem declarations, gem unpacking, and local generator lookup are restricted.

Customers can receive notifications about security vulnerabilities and new Rails LTS releases by subscribing to a mailing list during order or manually.

Bundler 1.12+ may print HTTP 403 Forbidden for the compact gem index, but Rails LTS still installs correctly after falling back to the old index.

Choose the changelog for a specific Ruby on Rails version, including the LTS releases from 2.3 through 7.2.

LTS changelog for Rails 2.3 and Rack 1.4 backports security fixes, compatibility updates, and bug repairs for older applications.

Security and compatibility updates for Rails 3.2 LTS and backported Rack fixes address CVEs, ReDoS, DoS, XSS, and Ruby version support.

Rails 4.2 LTS receives continued security backports, Rack updates, and compatibility fixes for newer Ruby versions and Bundler.

Security and compatibility updates for Rails 5.2 LTS, including backported fixes for XSS, ReDoS, DoS, path traversal, and Rack vulnerabilities.

Rails 6.1 LTS security releases and dependency bumps backport vulnerability fixes in Rails and Rack, including XSS, ReDoS, path traversal, and log injection.

Initial Rails 7.2 LTS release with a backported CVE-2026-41316 fix and Ruby 3.1+ support, closely matching Rails 7.2.3.1.

Rails LTS CVE status list for versions 2.3+ tracks which security issues are fixed, unaffected, or partially mitigated across Rails and Rack releases.

Serialized params from Rails LTS can fail to load after upgrading, with missing constant errors for ActionDispatch::Http::ParamsHashWithIndifferentAccess. An initializer alias to ActionController::Parameters restores compatibility.