Broken upgrade to susy 2.1.2 cannot load such file -- sass/script/node

Question

I have just updated to susy 2.1.2 from version 1.0.9 so I expected errors.

However, I have no idea what this means.

I do still have both versions installed:

Select gem to uninstall:
 1. susy-1.0.9
 2. susy-2.1.2
 3. All versions

When running my compass:dev I get the following, although the task still finished. How can I remove the erorrs?

Running "compass:dev" (compass) task
C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:135:in `require': cannot load such file -- sass/script/node (LoadError)
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass/sass_extensions/monkey_patches/browser_support.rb:1:in `<top (required)>'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass/sass_extensions/monkey_patches.rb:2:in `block in <top (required)>'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass/sass_extensions/monkey_patches.rb:1:in `each'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass/sass_extensions/monkey_patches.rb:1:in `<top (required)>'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass/sass_extensions.rb:9:in `<top (required)>'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass.rb:5:in `block in <top (required)>'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass.rb:4:in `each'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/lib/compass.rb:4:in `<top (required)>'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/bin/compass:20:in `block in <top (required)>'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/bin/compass:8:in `fallback_load_path'
        from C:/RUBY200/lib/ruby/gems/2.0.0/gems/compass-0.12.2/bin/compass:19:in `<top (required)>'
        from C:/Ruby200/bin/compass:23:in `load'
        from C:/Ruby200/bin/compass:23:in `<main>'

Running "watch" task
Waiting...

Answer 1

This is the message I got when trying to update Susy with bundler.

susy (~> 2.1.2) ruby depends on
  sass (~> 3.3.0) ruby

compass (~> 0.12.6) ruby depends on
  sass (3.2.19)

This means you will need at least Sass 3.3.0. The latest alpha pre release of Compass will work with this and you can install it with the following command:

gem install compass --pre

Alternatively if you are using a Gemfile you could install it like this:

gem "compass", "~> 1.0.0.alpha.19"

Answer 2

Your Gemfile need only have these:

gem "susy", "~>2.1.0"
gem "sass", "~>3.3.0"
gem "breakpoint", "~>2.4.0"

Bundler will sort out the other dependencies (which are many), as well as updating the gems to the latest versions.