I tried to add the following link to my gemspec :
s.add_dependency 'arel', '6.0.0.beta2'
then when I run bundle I get
Bundler could not find compatible versions for gem "arel":
In Gemfile:
subscribem (>= 0) ruby depends on
rails (~> 4.2.0) ruby depends on
activerecord (= 4.2.0) ruby depends on
arel (~> 6.0) ruby
subscribem (>= 0) ruby depends on
arel (6.0.0.beta2)
I need to update arel because it's causing some migration errors known here