git push heroku master でエラーが出ます。デプロイできません(T ^ T)

git push heroku masterを行うと、以下のように出ます。
remote: Warning: the running version of Bundler is older than the version that created the lockfile. We suggest you upgrade to the latest version of Bundler by running gem install bundler.
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: rake aborted!
remote: Exec

JS::RuntimeError:
1remote:        Error
2
3remote:        Tasks: TOP => assets:precompile
4remote:        (See full trace by running task with --trace)
5remote:  !
6remote:  !     Precompiling assets failed.
7remote:  !
8remote:  !     Push rejected, failed to compile Ruby app.
9remote: 
10remote:  !     Push failed
11remote: Verifying deploy....
12remote: 
13remote: !	Push rejected to toywonder-tel.
14remote: 
15To https://git.heroku.com/toywonder-tel.git
16 ! [remote rejected] master -> master (pre-receive hook declined)
17error: failed to push some refs to 'https://git.heroku.com/toywonder-tel.git'
18
19エラー箇所だけ抽出したものですが、何かアドバイスを頂けらばと思います！お願いします。

行動規範の内容に同意します

回答1件

Warning: the running version of Bundler is older than the version that created the lockfile. We suggest you upgrade to the latest version of Bundler by running gem install bundler.

実行しているバージョンが古いようです。
bundlerのバージョンをアップグレードする必要がある様です。

投稿2016/09/22 09:51