Rails 4 - Removed sqlite3 gem - “Detected sqlite3 gem which is not supported on Heroku”

Question

I've looked on as many existing answers as I can, but I can't figure out why heroku is still trying to install sqlite3. Below is my gemfile, I don't even have sqlite3 on it anymore, as I am using mysql in development, test, and production. What am I missing? I don't see any dependencies either?

I get the error Detected sqlite3 gem which is not supported on Heroku when trying to push.

gemfile

source 'https://rubygems.org'

gem 'thin'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.1'

#mysql
gem 'mysql2'


# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'

# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'

# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'

# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'

# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.2'

#tagging
gem 'acts-as-taggable-on'

#debugger
gem 'debugger'

#backup db with yaml_db
gem 'yaml_db', github: 'jetthoughts/yaml_db', ref: 'fb4b6bd7e12de3cffa93e0a298a1e5253d7e92ba'

group :doc do
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', require: false
end

Answer 1

As mentioned in the comments, you've probably not rebuilt your Gemfile.lock . The way to do this is to run bundle install on your development system (rebuilds Gemfile.lock ) and then push to Heroku again:

$ bundle install
$ git add .
$ git commit -a -m "SQLite3"
$ git push heroku master