getting error when trying "git push heroku master"

Following railstutorial.org, and I'm getting this error when I try to push to heroku:

# git push heroku master
Counting objects: 85, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (68/68), done.
Writing objects: 100% (85/85), 87.95 KiB, done.
Total 85 (delta 18), reused 0 (delta 0)
-----> Rails app detected
-----> Detected Rails is not set to serve static_assets
       Installing rails3_serve_static_assets... done
-----> Gemfile detected, running Bundler version 1.0.3
       Unresolved dependencies detected; Installing...
       You have modified your Gemfile in development but did not check
       the resulting snapshot (Gemfile.lock) into version control
       You have added to the Gemfile:
       * sqlite3-ruby (= 1.3.2)       
       You have deleted from the Gemfile:
       * sqlite3开发者_运维知识库-ruby
       FAILED: http://docs.heroku.com/bundler
 !     Heroku push rejected, failed to install gems via Bundler

Thanks in advance!

---

$ bundle install
$ git add Gemfile
$ git add Gemfile.lock
$ git commit -m "Make Gemfile and Gemfile.lock consistent with each other."
$ git push heroku master