Bundle update for padrino app: could not find compatible versions for "tilt"

Question

Running bundle update on my padrino app gives me:

Bundler could not find compatible versions for gem "tilt":
  In Gemfile:
    padrino (= 0.11.1) ruby depends on
      tilt (~> 1.3.0) ruby

    padrino (= 0.11.1) ruby depends on
      tilt (1.4.0)

This just started happening: not sure what's changed.
Running Ruby 1.9.3-p392

Gemfile looks like:

source 'https://rubygems.org'
ruby '1.9.3'

gem 'unicorn'
gem 'rake'

gem 'bcrypt-ruby', :require => 'bcrypt'
gem 'slim'
gem 'mongoid', '~>3.0.0'

gem 'haml'

gem 'padrino', '0.11.1'

Answer 1

Add gem 'tilt', '1.3.7' to your Gemfile.

Answer 2

This is a bug in the resolver of Bundler. I've opened an issue here: https://github.com/carlhuda/bundler/issues/2464

For now you can fix it by forcing Tilt to the 1.3-branch:

# Force Tilt 1.3 to avoid resolver bug: https://github.com/carlhuda/bundler/issues/2464
gem 'tilt', '~> 1.3.0'