ruby/rubygems · error · GemNotFound

Could not find gem '#{gem_name}'.

Error message

Could not find gem '#{gem_name}'.

What it means

Error "Could not find gem '#{gem_name}'." thrown in ruby/rubygems.

Source

Thrown at lib/bundler/cli/outdated.rb:37

      end

      # the patch level options imply strict is also true. It wouldn't make
      # sense otherwise.
      @strict = options["filter-strict"] || Bundler::CLI::Common.patch_level_options(options).any?
    end

    def run
      check_for_deployment_mode!

      Bundler::CLI::Common.validate_cooldown!(options[:cooldown])
      Bundler.settings.set_command_option_if_given :cooldown, options[:cooldown]

      Bundler.definition.validate_runtime!
      current_specs = Bundler.ui.silence { Bundler.definition.resolve }

      gems.each do |gem_name|
        if current_specs[gem_name].empty?
          raise GemNotFound, "Could not find gem '#{gem_name}'."
        end
      end

      current_dependencies = Bundler.ui.silence do
        Bundler.load.dependencies.map {|dep| [dep.name, dep] }.to_h
      end

      definition = if gems.empty? && sources.empty?
        # We're doing a full update
        Bundler.definition(true)
      else
        Bundler.definition(gems: gems, sources: sources)
      end

      Bundler::CLI::Common.configure_gem_version_promoter(
        Bundler.definition,
        options.merge(strict: @strict)
      )

View on GitHub (pinned to 86cbb817a3)

When it happens

Trigger: Thrown at lib/bundler/cli/outdated.rb:37 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ruby/rubygems@86cbb817a3 (2026-08-23). Data as JSON: /api/errors/af56d77e48ca8f57. Report an issue: GitHub.