Git push heroku master not deploying app - ruby-on-rails

Question

I was developing an app on Ruby on Rails. I was successfully able to add, commit and push it to heroku using
$ git push heroku master
Later I switched back to previous commit using
git reset --head Head^1
I did all the changes and pushed it back to heroku. When I opened my app, no changes were made and it was still on a previous version. Changes are being shown in my localhost but not on the server.
I restarted my app using
$ heroku restart -app app-name
And here is the output when I restarted:
Restarting dynos... done
This is the output when I pushed my app to heroku after restarting
Counting objects: 9, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (5/5), done.
Writing objects: 100% (5/5), 435 bytes | 0 bytes/s, done.
Total 5 (delta 4), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.2.0
remote: -----> Installing dependencies using 1.9.7
remote: Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote: Using i18n 0.7.0
remote: Using json 1.8.2
remote: Using rake 10.4.2
remote: Using minitest 5.5.1
remote: Using thread_safe 0.3.4
remote: Using builder 3.2.2
remote: Using erubis 2.7.0
remote: Using mini_portile 0.6.2
remote: Using rack 1.6.0
remote: Using mime-types 2.4.3
remote: Using arel 6.0.0
remote: Using execjs 2.3.0
remote: Using bcrypt 3.1.10
remote: Using sass 3.4.13
remote: Using net-ssh 2.9.2
remote: Using coffee-script-source 1.9.1
remote: Using thor 0.19.1
remote: Using orm_adapter 0.5.0
remote: Using ffi 1.9.8
remote: Using tilt 1.4.1
remote: Using hike 1.2.3
remote: Using multi_json 1.10.1
remote: Using kgio 2.9.3
remote: Using libv8 3.16.14.7
remote: Using mimemagic 0.3.0
remote: Using subexec 0.2.3
remote: Using pg 0.18.1
remote: Using bundler 1.9.7
remote: Using rails_serve_static_assets 0.0.4
remote: Using rails_stdout_logging 0.0.3
remote: Using raindrops 0.13.0
remote: Using ref 1.0.5
remote: Using dropbox-sdk 1.6.4
remote: Using tzinfo 1.2.2
remote: Using nokogiri 1.6.6.2
remote: Using rack-test 0.6.3
remote: Using warden 1.2.3
remote: Using mail 2.6.3
remote: Using autoprefixer-rails 5.1.7
remote: Using uglifier 2.7.0
remote: Using net-sftp 2.1.2
remote: Using coffee-script 2.3.0
remote: Using figaro 1.1.0
remote: Using sys-uname 0.9.0
remote: Using haml 4.0.6
remote: Using sprockets 2.12.3
remote: Using rails_12factor 0.0.3
remote: Using unicorn 4.8.3
remote: Using therubyracer 0.12.1
remote: Using activesupport 4.2.0
remote: Using bootstrap-sass 3.3.3
remote: Using mini_magick 3.8.0
remote: Using loofah 2.0.1
remote: Using imagemagick-binaries 6.8.7.5.1
remote: Using rails-html-sanitizer 1.0.1
remote: Using rails-deprecated_sanitizer 1.0.3
remote: Using globalid 0.3.3
remote: Using activemodel 4.2.0
remote: Using climate_control 0.0.3
remote: Using jbuilder 2.2.8
remote: Using pundit 0.3.0
remote: Using rails-dom-testing 1.0.5
remote: Using activejob 4.2.0
remote: Using activerecord 4.2.0
remote: Using carrierwave 0.10.0
remote: Using cocaine 0.5.7
remote: Using actionview 4.2.0
remote: Using polyamorous 1.1.0
remote: Using carrierwave-dropbox 1.2.1
remote: Using carrierwave-ftp 0.2.8
remote: Using paperclip 4.3.0
remote: Using actionpack 4.2.0
remote: Using paperclip-dropbox 1.3.2
remote: Using actionmailer 4.2.0
remote: Using railties 4.2.0
remote: Using sprockets-rails 2.2.4
remote: Using kaminari 0.16.3
remote: Using ransack 1.6.3
remote: Using simple_form 3.1.0
remote: Using mail_form 1.5.1
remote: Using coffee-rails 4.1.0
remote: Using responders 2.1.0
remote: Using font-awesome-rails 4.3.0.0
remote: Using jquery-rails 4.0.3
remote: Using sass-rails 5.0.1
remote: Using lightbox2-rails 2.7.1
remote: Using rails 4.2.0
remote: Using turbolinks 2.5.3
remote: Using devise 3.4.1
remote: Using jquery-datatables-rails 3.2.0
remote: Using devise_invitable 1.4.1
remote: Using upmin-admin 0.1.01
remote: Bundle complete! 34 Gemfile dependencies, 92 gems now installed.
remote: Gems in the groups development and test were not installed.
remote: Bundled gems are installed into ./vendor/bundle.
remote: Bundle completed (1.07s)
remote: Cleaning up the bundler cache.
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: Asset precompilation completed (5.58s)
remote: Cleaning assets
remote: Running: rake assets:clean
remote:
remote: ###### WARNING:
remote: No Procfile detected, using the default web server (webrick)
remote: https://devcenter.heroku.com/articles/ruby-default-web-server
remote:
remote: -----> Discovering process types
remote: Procfile declares types -> (none)
remote: Default types for Ruby -> console, rake, web, worker
remote:
remote: -----> Compressing... done, 155.5MB
remote: -----> Launching... done, v123
remote: https://app-name.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy.... done.
To https://git.heroku.com/app-name.git
6cb4846..275460b master -> master

Answer 1

Restart your heroku app and check again. Here is the command
heroku restart -a app_name

Answer 2

Later I switched back to previous commit using
git reset --head Head^1
Since you've rewrote history, a normal push won't be accepted as it is not a fast forward.
There are two possible solutions:
Force push your current branch:
$ git push -f heroku master
If all what you want is to have the previous live version back, run a rollback:
$ heroku rollback