[Heroku][Rails] ! Failed to install gems via Bundler - ruby-on-rails

Question

First of everything, this is my first question.
I used Strack Overflow just for years, an I want to say thank you for every single guy that expend time Asking and Answering questions.
You guys made possible my career
I'm trying to deploy a Rails app in Heroku but I'm receiving this error after pushing the branch:
Failed to install gems via Bundler.
My gems files are really simples:
Gemfile:
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
ruby '2.3.1'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.0'
gem 'pg', '~> 0.21'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.5'
gem 'bootsnap', '>= 1.1.0', require: false
gem 'responders'
gem 'dotenv-rails'
gem 'active_model_serializers', '~>0.9.4'
gem 'httparty'
group :development, :test do
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end
group :development do
gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '< 3.2'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
#gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
Gemfile.lock:
GEM
remote: https://rubygems.org/
specs:
actioncable (5.2.0)
actionpack (= 5.2.0)
nio4r (~> 2.0)
websocket-driver (>= 0.6.1)
actionmailer (5.2.0)
actionpack (= 5.2.0)
actionview (= 5.2.0)
activejob (= 5.2.0)
mail (~> 2.5, >= 2.5.4)
rails-dom-testing (~> 2.0)
actionpack (5.2.0)
actionview (= 5.2.0)
activesupport (= 5.2.0)
rack (~> 2.0)
rack-test (>= 0.6.3)
rails-dom-testing (~> 2.0)
rails-html-sanitizer (~> 1.0, >= 1.0.2)
actionview (5.2.0)
activesupport (= 5.2.0)
builder (~> 3.1)
erubi (~> 1.4)
rails-dom-testing (~> 2.0)
rails-html-sanitizer (~> 1.0, >= 1.0.3)
active_model_serializers (0.9.7)
activemodel (>= 3.2)
concurrent-ruby (~> 1.0)
activejob (5.2.0)
activesupport (= 5.2.0)
globalid (>= 0.3.6)
activemodel (5.2.0)
activesupport (= 5.2.0)
activerecord (5.2.0)
activemodel (= 5.2.0)
activesupport (= 5.2.0)
arel (>= 9.0)
activestorage (5.2.0)
actionpack (= 5.2.0)
activerecord (= 5.2.0)
marcel (~> 0.3.1)
activesupport (5.2.0)
concurrent-ruby (~> 1.0, >= 1.0.2)
i18n (>= 0.7, < 2)
minitest (~> 5.1)
tzinfo (~> 1.1)
arel (9.0.0)
bindex (0.5.0)
bootsnap (1.3.1)
msgpack (~> 1.0)
builder (3.2.3)
byebug (10.0.2)
concurrent-ruby (1.0.5)
crass (1.0.4)
dotenv (2.5.0)
dotenv-rails (2.5.0)
dotenv (= 2.5.0)
railties (>= 3.2, < 6.0)
erubi (1.7.1)
execjs (2.7.0)
ffi (1.9.25)
globalid (0.4.1)
activesupport (>= 4.2.0)
httparty (0.16.2)
multi_xml (>= 0.5.2)
i18n (1.0.1)
concurrent-ruby (~> 1.0)
jbuilder (2.7.0)
activesupport (>= 4.2.0)
multi_json (>= 1.2)
listen (3.1.5)
rb-fsevent (~> 0.9, >= 0.9.4)
rb-inotify (~> 0.9, >= 0.9.7)
ruby_dep (~> 1.2)
loofah (2.2.2)
crass (~> 1.0.2)
nokogiri (>= 1.5.9)
mail (2.7.0)
mini_mime (>= 0.1.1)
marcel (0.3.2)
mimemagic (~> 0.3.2)
method_source (0.9.0)
mimemagic (0.3.2)
mini_mime (1.0.0)
mini_portile2 (2.3.0)
minitest (5.11.3)
msgpack (1.2.4)
multi_json (1.13.1)
multi_xml (0.6.0)
nio4r (2.3.1)
nokogiri (1.8.4)
mini_portile2 (~> 2.3.0)
pg (0.21.0)
rack (2.0.5)
rack-test (1.1.0)
rack (>= 1.0, < 3)
rails (5.2.0)
actioncable (= 5.2.0)
actionmailer (= 5.2.0)
actionpack (= 5.2.0)
actionview (= 5.2.0)
activejob (= 5.2.0)
activemodel (= 5.2.0)
activerecord (= 5.2.0)
activestorage (= 5.2.0)
activesupport (= 5.2.0)
bundler (>= 1.3.0)
railties (= 5.2.0)
sprockets-rails (>= 2.0.0)
rails-dom-testing (2.0.3)
activesupport (>= 4.2.0)
nokogiri (>= 1.6)
rails-html-sanitizer (1.0.4)
loofah (~> 2.2, >= 2.2.2)
railties (5.2.0)
actionpack (= 5.2.0)
activesupport (= 5.2.0)
method_source
rake (>= 0.8.7)
thor (>= 0.18.1, < 2.0)
rake (12.3.1)
rb-fsevent (0.10.3)
rb-inotify (0.9.10)
ffi (>= 0.5.0, < 2)
responders (2.4.0)
actionpack (>= 4.2.0, < 5.3)
railties (>= 4.2.0, < 5.3)
ruby_dep (1.5.0)
sass (3.5.7)
sass-listen (~> 4.0.0)
sass-listen (4.0.0)
rb-fsevent (~> 0.9, >= 0.9.4)
rb-inotify (~> 0.9, >= 0.9.7)
sass-rails (5.0.7)
railties (>= 4.0.0, < 6)
sass (~> 3.1)
sprockets (>= 2.8, < 4.0)
sprockets-rails (>= 2.0, < 4.0)
tilt (>= 1.1, < 3)
sprockets (3.7.2)
concurrent-ruby (~> 1.0)
rack (> 1, < 3)
sprockets-rails (3.2.1)
actionpack (>= 4.0)
activesupport (>= 4.0)
sprockets (>= 3.0.0)
thor (0.20.0)
thread_safe (0.3.6)
tilt (2.0.8)
turbolinks (5.1.1)
turbolinks-source (~> 5.1)
turbolinks-source (5.1.0)
tzinfo (1.2.5)
thread_safe (~> 0.1)
uglifier (4.1.17)
execjs (>= 0.3.0, < 3)
web-console (3.6.2)
actionview (>= 5.0)
activemodel (>= 5.0)
bindex (>= 0.4.0)
railties (>= 5.0)
websocket-driver (0.7.0)
websocket-extensions (>= 0.1.0)
websocket-extensions (0.1.3)
PLATFORMS
ruby
DEPENDENCIES
active_model_serializers (~> 0.9.4)
bootsnap (>= 1.1.0)
byebug
dotenv-rails
httparty
jbuilder (~> 2.5)
listen (>= 3.0.5, < 3.2)
pg (~> 0.21)
rails (~> 5.2.0)
responders
sass-rails (~> 5.0)
turbolinks (~> 5)
uglifier (>= 1.3.0)
web-console (>= 3.3.0)
RUBY VERSION
ruby 2.3.1p112
BUNDLED WITH
1.16.3
Complete build log
! Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
Detected buildpacks: Ruby,Node.js
See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.3.1
-----> Installing dependencies using bundler 1.15.2
Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.
The dependencies in your gemfile changed
You have added to the Gemfile:
* responders
* dotenv-rails
* active_model_serializers (~> 0.9.4)
* httparty
You have deleted from the Gemfile:
* capybara (< 4.0, >= 2.15)
* chromedriver-helper
* coffee-rails (~> 4.2)
* selenium-webdriver
* spring
* spring-watcher-listen (~> 2.0.0)
Bundler Output: You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.
The dependencies in your gemfile changed
You have added to the Gemfile:
* responders
* dotenv-rails
* active_model_serializers (~> 0.9.4)
* httparty
You have deleted from the Gemfile:
* capybara (< 4.0, >= 2.15)
* chromedriver-helper
* coffee-rails (~> 4.2)
* selenium-webdriver
* spring
* spring-watcher-listen (~> 2.0.0)
!
! Failed to install gems via Bundler.
!
! Push rejected, failed to compile Ruby app.
! Push failed
I already tried re-building my Gemfile.lock.
I deleted it and run bundle update + bundle install
This is my first time in Heroku, and I afraid that maybe I'm pushing some incompatibles gems.
About the settings:
ruby 2.3.1 and rails 5.2.0
I will appreciate your help!
Thanks.

Answer 1

I found that adding the current ruby version you are running into the gem file then running
bundle update --ruby
does the job pretty well.
This article from heroku explains more
https://devcenter.heroku.com/articles/ruby-versions