Are you sure the container is out of date or if it’s Bundler having added “BUNDLED WITH” to the lock file?
I can’t find the discussion now, but AFAIK this was causing grief and it no longer does this.
## 2.1.4 (January 5, 2020)
Bugfixes:
- Fix `net-http-pipeline` no longer being allowed in Gemfiles if already installed in the system due to our vendored version of `net-http-persistent` optionally requiring it [#7529](https://github.com/bundler/bundler/pull/7529)
- Fix inline gems no longer being requirable if no Gemfile is present in the directory hierarchy [#7537](https://github.com/bundler/bundler/pull/7537)
## 2.1.3 (January 2, 2020)
Bugfixes:
- Fix `rake build` when path has spaces on it [#7514](https://github.com/bundler/bundler/pull/7514)
- Fix `rake release` git push tasks when the running shell has `git` as an alias of another command (like `hub`) [#7510](https://github.com/bundler/bundler/pull/7510)
- Fix some circular require warnings [#7520](https://github.com/bundler/bundler/pull/7520)
- Fix `bundle config set deployment true` recommended alternative to `bundle config --deployment` to behave in the same way as the `--deployment` flag [#7519](https://github.com/bundler/bundler/pull/7519)
## 2.1.2 (December 20, 2019)
Bugfixes:
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