BUNDLE_ONLY=<name> bundle install raises "Could not find compatible versions"

[yahonda]

Describe the problem as clearly as you can

$ ruby -v
ruby 4.0.4 (2026-05-12 revision b89eb1bcbf) +PRISM [x86_64-linux]
$ gem -v
4.0.10
$ BUNDLE_ONLY=ci bundle install
Fetching https://github.com/rails/rails.git
Fetching gem metadata from https://rubygems.org/...........
Resolving dependencies...
Could not find compatible versions

Because every version of activerecord depends on activesupport = 8.2.0.alpha
  and activesupport = 8.2.0.alpha could not be found in rubygems repository https://rubygems.org/ or installed locally,
  activerecord cannot be used.
So, because Gemfile depends on activerecord >= 0,
  version solving has failed.
$

Did you try upgrading rubygems & bundler?

Yes.

$ ruby -v
ruby 4.0.4 (2026-05-12 revision b89eb1bcbf) +PRISM [x86_64-linux]
$ gem -v
4.0.11
$ bundler -v
4.0.11
$ BUNDLE_ONLY=ci bundle install
Fetching https://github.com/rails/rails.git
Fetching gem metadata from https://rubygems.org/...........
Resolving dependencies...
Could not find compatible versions

Because every version of activerecord depends on activesupport = 8.2.0.alpha
  and activesupport = 8.2.0.alpha could not be found in rubygems repository https://rubygems.org/ or installed locally,
  activerecord cannot be used.
So, because Gemfile depends on activerecord >= 0,
  version solving has failed.
$

Post steps to reproduce the problem

• Ruby is installed via mise (mise install ruby@4.0.4)

Which command did you run?

1. Create Gemfile

source "https://rubygems.org"

gem "activerecord", git: "https://github.com/rails/rails.git", branch: "main"

group :ci do
  gem "rubocop"
end

2. BUNDLE_ONLY=ci bundle install

What were you expecting to happen?

It should install rubocop gem.

What happened instead?

$ BUNDLE_ONLY=ci bundle install
Fetching https://github.com/rails/rails.git
Fetching gem metadata from https://rubygems.org/...........
Resolving dependencies...
Could not find compatible versions

Because every version of activerecord depends on activesupport = 8.2.0.alpha
  and activesupport = 8.2.0.alpha could not be found in rubygems repository https://rubygems.org/ or installed locally,
  activerecord cannot be used.
So, because Gemfile depends on activerecord >= 0,
  version solving has failed.

If not included with the output of your command, run bundle env and paste the output below

$ bundle env

Environment

Bundler       4.0.11
  Platforms   ruby, x86_64-linux
Ruby          4.0.4p0 (2026-05-12 revision b89eb1bcbfcd0cca47e07d5d105a9df21a5b5feb) [x86_64-linux]
  Full Path   /home/yahonda/.local/share/mise/installs/ruby/4.0.4/bin/ruby
  Config Dir  /home/yahonda/.local/share/mise/installs/ruby/4.0.4/etc
RubyGems      4.0.11
  Gem Home    /home/yahonda/.local/share/mise/installs/ruby/4.0.4/lib/ruby/gems/4.0.0
  Gem Path    /home/yahonda/.local/share/gem/ruby/4.0.0:/home/yahonda/.local/share/mise/installs/ruby/4.0.4/lib/ruby/gems/4.0.0
  User Home   /home/yahonda
  User Path   /home/yahonda/.local/share/gem/ruby/4.0.0
  Bin Dir     /home/yahonda/.local/share/mise/installs/ruby/4.0.4/bin
Tools
  Git         2.54.0
  RVM         not installed
  rbenv       not installed
  chruby      not installed

Bundler Build Metadata

Timestamp  2026-05-12
Git SHA    b7155a3865

Gemfile

Gemfile

source "https://rubygems.org"

gem "activerecord", git: "https://github.com/rails/rails.git", branch: "main"

group :ci do
  gem "rubocop"
end

Gemfile.lock

<No /home/yahonda/Gemfile.lock found>

[yahonda]

• With bundler 4.0.6 : it passes.

$ gem install bundler -v 4.0.6
Fetching bundler-4.0.6.gem
Successfully installed bundler-4.0.6
Parsing documentation for bundler-4.0.6
Installing ri documentation for bundler-4.0.6
Done installing documentation for bundler after 0 seconds
1 gem installed
$ BUNDLER_VERSION=4.0.6 BUNDLE_ONLY=ci bundle install
Fetching https://github.com/rails/rails.git
Fetching gem metadata from https://rubygems.org/........
Resolving dependencies...
Fetching ast 2.4.3
Fetching json 2.19.5
Fetching language_server-protocol 3.17.0.5
Fetching lint_roller 1.1.0
Installing lint_roller 1.1.0
Installing ast 2.4.3
Fetching parallel 2.1.0
Fetching prism 1.9.0
Installing language_server-protocol 3.17.0.5
Installing json 2.19.5 with native extensions
Installing parallel 2.1.0
Fetching rainbow 3.1.1
Installing rainbow 3.1.1
Fetching regexp_parser 2.12.0
Installing regexp_parser 2.12.0
Fetching ruby-progressbar 1.13.0
Installing ruby-progressbar 1.13.0
Fetching unicode-emoji 4.2.0
Fetching parser 3.3.11.1
Installing prism 1.9.0 with native extensions
Installing unicode-emoji 4.2.0
Fetching unicode-display_width 3.2.0
Installing unicode-display_width 3.2.0
Installing parser 3.3.11.1
Fetching rubocop-ast 1.49.1
Installing rubocop-ast 1.49.1
Fetching rubocop 1.86.1
Installing rubocop 1.86.1
Bundle complete! 2 Gemfile dependencies, 15 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
$

• With Bundler 4.0.7 : it fails

$ rm Gemfile.lock
$ gem install bundler -v 4.0.7
Fetching bundler-4.0.7.gem
Successfully installed bundler-4.0.7
Parsing documentation for bundler-4.0.7
Installing ri documentation for bundler-4.0.7
Done installing documentation for bundler after 0 seconds
1 gem installed
$ BUNDLER_VERSION=4.0.7 BUNDLE_ONLY=ci bundle install
Fetching https://github.com/rails/rails.git
Fetching gem metadata from https://rubygems.org/...........
Resolving dependencies...
Could not find compatible versions

Because every version of activerecord depends on activesupport = 8.2.0.alpha
and activesupport = 8.2.0.alpha could not be found in rubygems repository https://rubygems.org/ or
installed locally,
  activerecord cannot be used.
So, because Gemfile depends on activerecord >= 0,
  version solving has failed.
$

[yahonda]

This issue appears when my GitHub Actions uses Ruby 4.0.4 that installs newer versions of bundler by default. https://github.com/rsim/oracle-enhanced/actions/runs/25705374652/job/75474223421

The same workflow worked fine with Ruby 4.0.3 https://github.com/rsim/oracle-enhanced/actions/runs/25643882705/job/75268930517